# LEVEL

level_energy_unit: KEV
level_spin_parity: 1+,2+
level_comment:
J$2007Sa03 assign 0+,1+; however, this is probably the same level as the 502.8 fed by a primary transition thus ruling out 0+ 


level_energy_unit: KEV
level_energy_info: ;ERR=?
level_spin_parity: (6- & 7-)
level_comment:
J 1976Gr19 assign J|p=(6-) only; 1976KaZL propose that the level is a doublet, consisting of the 6- and 7- members of the same band 


level_energy_unit: KEV
level_energy_info: ;ERR=?
level_comment:
E,J$1976KaZL report a doublet at 1230 with tentative assignments as the (6+) member of a K|p=5+ band and the (3+) member of a K|p=0+ band. They do not report the 1227 level 


level_energy_unit: KEV
level_spin_parity: 5/2-
level_lifetime_unit: Y
level_comment:
J$spin measured from study of hyperfine structure of atomic spectral lines (1954Co19); parity is from Nilsson orbital assignment which is from agreement of measured |m with the calculated value. 
$|m({+243}Am)=+1.503 {I14} was obtained by 1990Iz01 from |m({+241}Am)/|m({+243}Am)=1.052 {I7} and |m({+241}Am)=+1.58 {I1} (1990Iz01); hyperfine structure and isotope shift measurements by LASER spectroscopy. Compiled by 2011StZZ. Others: +1.61 {I4} (1966Ar04, 1956Ma31) 
$Q({+243}Am)=+2.86 {I3} from Q({+241}Am)/Q({+243}Am)=1.10 {I2} and Q({+241}Am)=+3.14 {I5}, measured by 1990Iz01. Compiled by 2011StZZ. Others: +4.2 {I13} (1956Ma31) 
T$T{-1/2}=7357 y {I23} was determined from relative activity method using a value of T{-1/2}({+241}Am)=432.2 y {I7} by 2007Ag02. Using the adopted T{-1/2}({+241}Am)=432.6 y {I6} from 2005Ma88, evaluators have recalculated T{-1/2}({+243}Am)=7364 y {I22}. Others: 7370 y {I40} (1968Br22), 7380 y {I17} (1974Po17), 7360 y {I42} (1980Ag05, 1986Ag01). Earlier measurements: 1953Di27, 1954As05, 1957Bu49, 1958Wa69, 1959Ba22, 1960Be10. 
$T{-1/2}(SF)=2.0|*10{+14} y {I5} (1966Gv01). Other measurement: 3.3|*10{+13} y {I3} (1966Al23). Measurement of 1966Gv01 was recommended by 1989Ho24. 
$For a compilation and T{-1/2}(SF) systematics, see 1997Ro12. 
$%|a/%SF=2.66|*10{+10} {I50} was measured by 2002Sa53. This ratio yields %SF=3.8|*10{+-9} {I7} which agrees well with the adopted branching of %SF=3.7|*10{+-9} {I9}, obtained from T{-1/2}(total)=7364 y {I22} and T{-1/2}(SF)=2.0|*10{+14} y {I5}. 


level_energy_unit: KEV
level_spin_parity: 7/2-
level_lifetime_unit: PS
level_lifetime_info: ;ERR=AP
level_comment:
J$42.2|g is M1+E2; energy fit to the band 
T$from B(E2)=6.89 {I10} in Coulomb Excitation and |d|?0.28 


level_energy_unit: KEV
level_spin_parity: 5/2+
level_lifetime_unit: NS
level_comment:
$|m value by Mossbauer spectroscopy (1986Sa10). Compiled by 2011StZZ 
$Q value by Mossbauer spectroscopy (1989Ra17). Compiled by 2011StZZ 
J$84.0|g to 5/2- is E1 
T$From delayed |b{+-} -84 keV |g coincidence measurement (1969Fr01) in {+243}Pu |b-decay. 
$The resonance of the 84.0|g was observed, and from the measured isomeric shift, |D<r{+2}>/<r{+2}>=-9|*10{+-4} {I3} was calculated by 1969Ka17. 


level_energy_unit: KEV
level_spin_parity: 9/2-
level_comment:
J$level is Coulomb excited; |g's to 5/2-, 7/2- states; energy fit to the band; ({+3}He,d), (|a,t) reaction data. 


level_energy_unit: KEV
level_spin_parity: 3/2-
level_comment:
J$(M1+E2) |g to 5/2- level; ({+3}He,d) and (|a,t) reaction data; |a hindrance factor=1.14 in 3/2- {+247}Bk decay. 


level_energy_unit: KEV
level_lifetime_unit: US
level_comment:
E$recommended by 1980Bj02. 
$Second minimum of the fission barrier was calculated: E=1.80 MeV (1972We09), 2.10 MeV {I20} (1973Br04), 2.0 MeV (1987Gu03), 1.80 MeV (1990Bh02). 
T$weighted average of: 6.5 |ms {I10} (1970Po01), 5.2 |ms {I5} (1972Wo07), and 6 |ms {I3} (1973Na35). Other: 1973Br04. 
$Only SF decay was observed. Search by 1976Be55 for conversion electrons of 267-keV |g transition from the 3/2- state in {+243}Am to the ground state yielded negative results. 
$Assignment: {+243}Am(d,pn) excit (1970Po01,1971Br39); {+244}Pu(p,2n) excit (1972Wo07); {+242}Pu(t,2n) excit (1972Br35). 
$From comparison of their experimental and calculated excitation function for {+243}Am(|g,|g') reaction, 1971Ga39 deduced that this shape isomer was populated predominantly from levels lying above the fission barrier. 
$Cross-sections for populating the isomer via {+243}Am(n,n') reaction were measured by 1971Ga35. 
$See 1980Bj02 for an extensive review of spontaneously fissioning isomers. See also 1977VaYN. Experimental searches for |a and |g decays from spontaneously fissioning isomers were reviewed by 1992Ma34. 


level_energy_unit: KEV
level_spin_parity: 5/2-
level_comment:
$Q=4.29 {I3} based on intrinsic quadrupole moment of 12.02 {I9} deduced for the 42.4- and 96.4-keV levels (1981Be54). 


level_energy_unit: KEV
level_spin_parity: 5/2-
level_lifetime_unit: Y
level_comment:
T$weighted average of 7342 y {I14} from absolute counting and 7349 y {I15} from relative measurement (2020Ma63). The relative value is obtained from measurement of 16.988 {I24} for the ratio of the {+243}Am/{+241}Am half lives and using T{-1/2}({+241}Am)=432.6 y {I6}. 


level_energy_unit: KEV
level_spin_parity: (6-)
level_lifetime_unit: H
level_comment:
E$Ground state in (d,p) measurement was not resolved due to contamination 
T$From decay measurement in 1962Va08. 
J$Coupling of the 5/2-[523] proton state (in analogy to {+241,243}Am isotopes: the 95 th. proton is probably in the 5/2[523] state) and the 7/2+[624] neutron state (in analogy to {+243}Pu, {+245}Cm: the 149 th. neutron is probably in the 7/2[624] state). Gallagher-Moszkowski (1958Ga27) rule gives 6-, (|p 5/2[523]+|n 7/2[624]) for probable configuration of the ground state. Another possibility, analogy to {+245}Am which has probable configuration of |p 5/2[642], yielding J|p=1+, (|p 5/2[642]-|n 7/2[624]), is not consistent with the {+244}Am beta decay to {+244}Cm. 


level_energy_unit: KEV
level_spin_parity: 1+
level_lifetime_unit: MIN
level_lifetime_info: ;ERR=?;ISO=M1
level_comment:
E$The level observed in (d,p) at 80 keV is assumed to be the same state identified in (n,|g). 
J$log{Ift} values of 6.4 and 6.8 for the |b{+-} transition to 0+ and 2+ states in {+244}Cm permit J=1. Its band assignment with the configuration of 1+, (|p 5/2[642]-|n 7/2[624]) is consistent with its beta decay and with the systematics of Nilsson orbitals. 1-, (|p 5/2[523]-|n 7/2[624]) state was assigned earlier by 1962Va08 from isomer's beta decay. 
%EC$Weighted average of |e/|b ratio of 0.000361 {I13} (1976Ga31) and 0.00038 {I3} (1955Fi36). Current adopted T{-1/2}({+244}Cm)= 18.11 y {I3} has been used by the evaluator to adjust the original ratio. 1976Ga31: %|e=0.0361 {I13} was determined from the ratio of {+244}Pu/{+240}Pu amounts (mass-spectrometric analysis) in chemically separated Pu fraction from {+243}Am(n,|g) reaction. The products were cooled for 160 days before chemical separation in order to accumulate enough {+240}Pu, the alpha-decay product of {+244}Cm; T{-1/2}({+244}Cm)=18.099 y {I150} was used in calculations. 1955Fi36: %|e=0.039 {I3} was determined from the ratio of {+244}Pu/{+244}Cm amounts following irradiation of {+243}Am with neutrons; T{-1/2}({+244}Cm)=18.4 y {I5} was used in calculations. 
T$From decay measurement in 1954Gh24. Uncertainty was not provided by the authors. Other: |?25 min (1950St61) 
E$Level energy is deduced from S(n)=5367.2 {I16} (2017Wa10) and E{-|g}=5277.6 {I4} (recoil correction applied from neutron- capture state) 


level_energy_unit: KEV
level_spin_parity: 1-
level_comment:
J$75.3475 and 87.6553 |g's to 2+ and 1+ levels of K=1 band are E1+M2. The relative intensities of these |g's agree well with the Alaga rule for K=J=1, but not for J=2. 
$Alaga rule for E1 part of these two gammas predicts: I(87.65G;E1)/I(75.34G;E1) =(87.6553/75.3475)**3 (0.5/0.5)=1.57 for K=J=1; =(87.6553/75.3475)**3 (0.60/0.33)=2.83 for K=J=2; =(87.6553/75.3475)**3 (0.3000/0.1666667)=2.83 for K=1,J=2 and The experimental ratio of intensities for E1 parts is 99.9/66.9=1.49 


level_energy_unit: KEV
level_spin_parity: 3-
level_comment:
J$31.000 and 52.640 |g's to the 2- and 1- band members are M1 and E2, respectively; 80.0156|g to (4)+ level is E1+M2; energy fit to band 


level_energy_unit: KEV
level_spin_parity: 4-
level_comment:
E$274 keV level in (d,p) measurement was not resolved due to contamination 
J$43.904|g to 3- level is M1, 74.918|g to 2- is E2; energy fit to band 


level_energy_unit: KEV
level_spin_parity: 1-
level_comment:
J$91.9252 and 113.5625 |g's to the 2- and 1- members of the K=-1, (|p 5/2[523]-|n 7/2[624]) band are M1 and M1+E2, respectively. 53.43|g from the 3- state of the (|p 5/2[523]-|n 5/2[622]) band is E2. The I(188.910|g)/I(201.219|g) ratio does not agree with the Alaga rule for J=2, but in fair agreement for K=0, J=1. 
$The Alaga rule suggests: I(188.910|g)/I(201.219|g)= (188.910/201.219)**3(0.5/0.5)=0.83 for K=0, J=1; (188.910/201.219)**3 (0.16667/0.300)=0.46 for K=1, J=2 (188.910/201.219)**3 (0.333/0.60)=0.46 for K=2, J=2 (188.910/201.219)**3 (0.50/0.10)=4.14 for K=0, J=2. The experimental ratio is 1.7 4. 


level_energy_unit: KEV
level_spin_parity: 3-
level_comment:
J$34.975|g to 2- of the (|p 3/2[521]-|n 7/2[624]) band is E2; rotational band parameter calculated from the level energy fits the local trend. As pointed out by 1984Vo07, non-observation of |g transitions to lower bands is surprising. 


level_energy_unit: KEV
level_spin_parity: 5-
level_comment:
J$50.550|g to 4- level is M1; 94.454|g to 3- of the |p 5/2[523]-|n 7/2[624] band; energy fit to the band. 


level_energy_unit: KEV
level_spin_parity: 3+
level_comment:
J$248.097, 225.120, 200.117|g's to 2+, 3+, (4)+ states of the (|p 5/2[642]-|n 7/2[624]) band are M1+E2. 


level_energy_unit: KEV
level_energy_info: ;ERR=?
level_spin_parity: (5-)
level_comment:
E,J$Level observed in (d,p) was assigned by 1976Gr19 to a doublet: J{+|p}=(5-) state of the K=5, (|p5/2[523]+|n5/2[622]) band and J{+|p}=(2-) state of the K=0, (|p5/2[523]-|n5/2[622]) band which was seen also in (n,|g) at 369.1 keV. The primary gamma populating this level in (n,|g) was however considered questionable 


level_energy_unit: KEV
level_spin_parity: (0)+
level_comment:
J$289.0570|g to 1+ state of the (|p 5/2[642]-|n 7/2[624]) band is M1; 201.393|g to 1- level; no |g's to higher-spin states. 


level_energy_unit: KEV
level_spin_parity: (4)+
level_comment:
J$41.630|g to 3+ state is M1; |g decay pattern is similar to that of 3+ member of the (|p 1/2[400]-|n 7/2[624]) band; the band parameter obtained from the level's energy is consistent with expected value. 


level_energy_unit: KEV
level_spin_parity: 2+
level_comment:
J$330.9556|g to 1+ level is M1, 122.299|g to 3- level is E1. The 122.299-keV |g to the (|p 3/2[521]-|n 7/2[624]) band requires configuration mixing. 


level_energy_unit: KEV
level_spin_parity: (3)-
level_comment:
J$72.7992|g to 3+ is E1+M2, and 320.887 |g's to 2+; relative photon intensity agree with the Alaga rule. 


level_energy_unit: KEV
level_energy_info: ;ERR=?
level_comment:
E$The authors of 1976Gr19 assigned the level they observed at 436 keV in (d,p) reaction to 6- state of the (|p5/2[523]+|n5/2[622]) band. If this assignment is correct, then the level seen in (d,p) and the level populated by primary |g at 432.5 keV in thermal neutron capture are not the same level. 


level_energy_unit: KEV
level_spin_parity: (4)-
level_comment:
J$112.285|g to 5- level is M1; 206.718|g to 3-; Band member favors J=4. From (d,p) data, 1976Gr19 assigned 4-(and 5-) of the (|p5/2[523]+|n5/2[622]) band to a level they observed at 452 keV. 


level_energy_unit: KEV
level_spin_parity: (5-)
level_comment:
E$1976Gr19 in (d,p) data proposed 4-( and 5-) of (|p5/2[523]+|n5/2[622]) band assignment. The 4- member was assigned from (n,|g) work to a level 436.5-keV. This level may be the 5- member of the band. 
J$Relative intensities of the 165.110|g to 4- and 114.557|g to a 5- of the (|p 5/2[523]-|n 7/2[624]) band agrees with the Alaga rule for K=0, J=5. 


level_energy_unit: KEV
level_spin_parity: (4)+
level_comment:
J$333.585|g to 3+ and 308.5818|g (4)+ states are M1; relative photon intensity agree with the Alaga rule. 


level_energy_unit: KEV
level_spin_parity: (2)+
level_comment:
E$479.2 in the (n,|g): primary |g dataset is a doublet 
J$354.8132- and 377.790-keV |g's to 3+ and 2+ levels are M1. 1984Vo07 suggested that this level might be the J|p=2+ of K=0, ((|p 5/2[642])-(|n 5/2[622])) state, based on its expected energy 


level_energy_unit: KEV
level_spin_parity: (4)+
level_comment:
E$479.2 in the (n,|g) dataset is a doublet 
J$355.068|g to 3+ level is M1; decay pattern is similar to those of 2+ and 3+ band members. 


level_energy_unit: KEV
level_spin_parity: (4)+
level_comment:
J$372.113|g to 3+ is M1; 311.899|g to (5)+; level-energy calculations by 1984Vo07 for the 4+ member of the band, including Coriolis interaction, agreed with the experimental energy. 


level_energy_unit: KEV
level_spin_parity: (3)-
level_comment:
J$252.052|g to (4)- level is M1(+E2). Level's decay pattern is similar to the decay of the 2- band head; energy spacing from the band head suggests that this level is the 3- member of the band. 


level_energy_unit: KEV
level_spin_parity: (2)+
level_comment:
J$527.252|g and the 514.925|g to 1+ and 2+ levels are M1; relative photon intensities of |g's deexciting the levels agree with the Alaga rule. 


level_energy_unit: KEV
level_spin_parity: (3)+
level_comment:
J$549.880 |g to 2+ is (M1) and 526.910-keV |g to 3+ level is M1; |g's to (4)+ and 2- states; relative photon intensities of |g's deexciting the level agree with the Alaga rule. 


level_energy_unit: KEV
level_spin_parity: (2)+
level_comment:
J$250.615|g to 2+ level is M1, 495.121|g to 1-, 213.952|g to (4)+. 
$1984Vo07 proposed J|p=(1,2)+ with configuration of K=1, ((|p 5/2[523])-(|n 7/2[743])), based on the strong 250.615|g to the 2+,(|p 5/2[523]-|n 9/2[734]) state, and on their prediction for the level energy. However, the strong 570.468 and 582.743 |g's to the K=1, (|p 5/2[642]-|n 7/2[624]) band require large admixture of configurations involving either or both of these |p or |n states. 


level_energy_unit: KEV
level_spin_parity: (1)-
level_comment:
J$504.915 and 483.276 |g's to 1-, 2- levels are M1; the I(504.915|g)/I(483.276|g) ratio agrees well with the Alaga rule for J=1, but not for J=2. 


level_energy_unit: KEV
level_spin_parity: (4+)
level_comment:
J$573.522|g to 3+ and 548.560|g to (4)+ are (M1); the I(573.522|g)/I(548.560|g) ratio agrees well with the Alaga rule for K=2,J=4, but not for K=2,J=3 


level_energy_unit: KEV
level_spin_parity: (5+)
level_comment:
J$573.187|g to (5)+ level is (M1); relative photon intensities of |g's deexciting the level agree with the Alaga rule. 


level_energy_unit: KEV
level_spin_parity: (4-)
level_comment:
E$781.3 in the (n,|g):primary |g's dataset is a doublet 
J$507.731|g to 4- level is (M1). Assignment to the band is tentative. 


level_energy_unit: KEV
level_spin_parity: (2)-
level_comment:
E$781.3 in the (n,|g):primary |g's dataset is a doublet 
J$483.492|g to (3)- level is M1, 692.18 |g to 1+. 


level_energy_unit: KEV
level_energy_info: ;ERR=?
level_spin_parity: (2-)
level_comment:
J$J{+|p}=2- of K=2, (|p5/2[523]-|n1/2[620]) band was assigned tentatively by 1976Gr19 from their (d,p) data. This level may be the same as either the 781.7 or the 784.4 level observed in (n,|g). 


level_energy_unit: KEV
level_spin_parity: (3)-
level_comment:
J$373.760|g to (4)- level is M1; 519.593|g to 1- level. J{+|p}=(3-) of K=2, (|p5/2[523]-|n1/2[620]) band was assigned by 1976Gr19 from their (d,p) data. 


level_energy_unit: KEV
level_energy_info: ;OFF=X
level_lifetime_unit: MS
level_lifetime_info: ;ISO=M2
level_comment:
$Only SF decay observed. 
T$Weighted average of 1.10 ms {I15} ({+243}Am(d,p): 1968Bj04); 0.60 ms {I15} ({+243}Am(n,|g): 1969Bo25); 1.1 ms {I2} ({+242}Pu(|a,pn): 1972Wo07); 0.9 ms {I3} ({+243}Am(n,|g): 1967Fl08). Other: 1.0 ms ({+209}Bi({+56}Fe, X)): 1980Vi04 1970Da05, 1969Bo25: Studied ratio of isomer formation to prompt fission. Theoretical calculations: T{-1/2}(SF)=0.4 ms (2005Re16) 


level_energy_unit: KEV
level_spin_parity: 1+
level_comment:
E$Deduced by the evaluator from the primary capture-gamma of 5277.6 keV {I4} (1984Vo07) with recoil energy considered and S(n)= 5367.2 keV {I16} (2017Wa10). Authors' original value was 85.0 keV {I30} with S(n)=5363 keV {I3}(1984Vo07) 


level_energy_unit: KEV
level_spin_parity: (2)+&(4)+
level_comment:
E$The adopted energies of this doublet are: ((2)+ state)=479.6 keV {I16}; ((4)+ state)=479.8 keV {I16}. 


level_energy_unit: KEV
level_spin_parity: (3)-
level_uncertain: S
level_comment:
E$Neutron capture state. E=S(n)=5367.2 keV {I16} 
J$from s-wave capture on the 5/2- target, J{+ |p}=2- or 3-; from |g transitions to (4)+ states, J{+ |p} is probably not 2-. 


level_energy_unit: KEV
level_uncertain: S
level_comment:
E$Ground state was not resolved at 120 |', due to contamination, and an upper limit for cross section was measured at 90|' 


level_energy_unit: KEV
level_spin_parity: 0+
level_comment:
$Q({+3}He,t)=-19558 keV {I27} for the transition to the isomeric analog state was measured. The Coulomb displacement energy was deduced from this Q value as 20322 keV {I27}. 


level_energy_unit: KEV
level_spin_parity: 5/2+
level_lifetime_unit: H
level_comment:
T$From weighted average of 123.0 min {I6} (decay, 1968Da02), 122.5 min {I8} (decay, 1983Po15). Others: 125 min {I5} (decay, 1955Br02), 119 min {I1} (decay, 1955Fi37) and 124 min {I1} (decay, 1956Bu92) 
J$M1(+E2) 327.4|g from 7/2+ 327-keV level to g.s; log{Ift}= 6.4 for the {+245}Am |b- feeding to the 5/2+ level in {+245}Cm rules out 9/2+; HF=98 for |a decay from 7/2+ g.s. of {+249}Bk excludes 7/2+; from the assigned bandhead configuration 


level_energy_unit: KEV
level_spin_parity: (5/2-)
level_comment:
J$(E1) 28|g to 5/2+ g.s.; comparison with single-particle energies in {+239}Am, {+241}Am, and {+243}Am and the large hindrance factor in the {+249}Bk |a decay suggest spin flip transition (2013Ah03); from the assigned bandhead configuration 


level_energy_unit: KEV
level_spin_parity: (3/2-)
level_comment:
E$From {+249}Bk |a decay 
J$From the only single particle-state available in this region, 3/2-[521] Nilsson state (2013Ah03); from the assigned bandhead configuration 


level_energy_unit: KEV
level_spin_parity: (7/2+)
level_comment:
J$(E2) 560.134|g to 7/2+ 327-keV level; (E2) 491.591|g to 9/2+ 396-keV level; 859.53|g to (5/2-) 28-keV level; 799.87|g to (11/2+) 88-keV level 


level_energy_unit: KEV
level_spin_parity: (9/2+,11/2+)
level_comment:
J$593.7|g to 7/2+ 327-keV level; 525.08|g to 9/2+ 396-keV level; 445.34|g to 11/2+ 476-keV level; 357.90|g to (13/2+) 563-keV level 


level_energy_unit: KEV
level_lifetime_unit: NS
level_lifetime_info: ;ISO=M1
level_comment:
E$No experimental value available. Estimated by evaluator based on systematics of SF isomers in odd americium isotopes given by 1971Br39 and calculated values by 1990Bh02 (E=2.60 MeV) and 2020Ja01 (E=2.23 MeV) 
$Only SF decay mode was observed. See {+244}Pu(t,2n) (1972Br35), {+244}Pu(|a,p2n) (1972Wo07). 
T$From measurement of the fissioning isomer produced by {+244}Pu(|a,p2n) reaction (1972Wo07). Other: 390 ns {I70} (1972Br35); Decay was followed for one period, the uncertainty is statistical only, and 1972Br35 stated that a systematic error in background subtraction could have led to an underestimated T{-1/2}. A half-life of 640 ns {I60} has also been recommended by 1973Br38 and 1990Bh02. See also 2002Si26. 


level_energy_unit: KEV
level_spin_parity: (7-)
level_lifetime_unit: MIN
level_comment:
$Configuration=((|p 5/2[642])+(|n 9/2[734])) (1984So03) 
T$weighted average of 39 min {I3} (1968Fi03) and 40 min {I7} (1967Or02) 


level_energy_unit: KEV
level_energy_info: ;OFF=X
level_spin_parity: (2-)
level_lifetime_unit: MIN
level_lifetime_info: ;ISO=M1
level_comment:
E LEVEL ENERGY HELD FIXED IN LEAST-SQUARES ADJUSTMENT 
E$From single-particle state calculations with configuration=((|p 5/2[642])-(|n 9/2[734])), X =30 keV {I10} (1984So03). 
T$Weighted average of 25.0 min {I2} (1955En16) and 24.7 min {I7} (1983Po14) 


level_energy_unit: KEV
level_energy_info: ;OFF=X
level_spin_parity: (1+)
level_lifetime_unit: NS
level_comment:
T$From |g|g(t) in {+246}Pu |b{+-} decay (1965St10) 
J$(E1) |g to 2(-) 0.0+X-keV level; (M1) |g from (1+) 223.7+X-keV level gives (1+) or (2+); |b{+-} feeding from 0+ rules out 2+. 


level_energy_unit: KEV
level_energy_info: ;ERR=AP;ERR=?
level_lifetime_unit: US
level_lifetime_info: ;ISO=M2
level_comment:
E$From 2002Si26 
$Fission isomer observed in {+244}Pu(|a,pn) (1972Wo07,2002Si26). 
T$From 1972Wo07. 


level_energy_unit: KEV
level_energy_info: ;OFF=X
level_spin_parity: (1+)
level_lifetime_unit: NS
level_comment:
E LEVEL ENERGY HELD FIXED IN LEAST-SQUARES ADJUSTMENT 
T$From |g|g(t) (1965St10). This value is given in the Adopted Levels 


level_energy_unit: KEV
level_spin_parity: (5/2)
level_lifetime_unit: MIN
level_comment:
J$From systematics of Nilsson orbitals (1977Ch27) suggesting 5/2+[642] in {+245}Am or 5/2-[523] in analogy to {+243}Am, {+241}Am and {+239}Am. 
T$From measurement of 1983Po14. Others: 20 min {I4} (1968Fi03), 24 min {I3} (1967Or02). 


level_energy_unit: KEV
level_uncertain: S
level_comment:
${+248}Am has not been observed. 
$The systematics of orbitals for this region (see, for example, 1972El21) suggests that the 153{+rd} neutron is probably in the 1/2[620] Nilsson orbital, and the 95{+th} proton is in either the 5/2[523] or the 5/2[642] orbital. 
T T{-1/2}(|b{+-}): A partial half-life for |b decay was calculated by 1973Ta30 using |b decay gross theory as >700 s. Calculations of 1997Mo25 yield >100 s. From systematics, 2012Au07 report |?180 s 
$A partial |a half-life, of 1|*10{+11} d - 4|*10{+11} d is calculated by the evaluator for an unhindered (unobserved)|?4600-keV |a to a level with the same configuration as that of the {+248}Am g.s.; the energy of this level is expected at about 250-350 keV above the {+244}Np g.s. (with configuration |p5/2[642], |n9/2[734]). The excitation energy of this level is estimated from 1/2[620] state energies in {+245}Pu (305 keV) and in {+247}Cm (403.6 keV). The energy differences between the 1/2[620] and the 9/2[734] neutron orbitals are 223 keV in {+243}Pu, 403.6 keV in {+247}Cm and 434.4 keV in {+249}Cf. The |a energy of |?4600 keV is calculated from Q(|a)({+248}Am)=4940, a systematics value from 2012Wa38 


level_energy_unit: KEV
level_uncertain: ?
level_comment:
E$Indirectly deduced from the detection of {+249}Cf (T{-1/2}=351 y) in the debris of the thermonuclear test. 
$|b{+-} is expected to be the dominant decay mode of {+249}Am, since the theoretical half-life for |a decay is 10{+15} s (2019Mo01) 
T$|b decay half-life=10{+15} s (theory,2019Mo01) 
J$1/2+ (theory,2019Mo01) 


level_energy_unit: KEV
level_lifetime_unit: S
level_comment:
T$measured by 2010Kh06 from ({+237}Cf)|a-correlated events 
J$3/2+ proposed from systematics (2017Au03); and also from |W(neutron)=3/2+ in theoretical calculations (2019Mo01) 
$Two |a lines of 7345 {I20} and 7254 {I20} with relative intensities of 0.7 {I3} and 0.3 {I+3-2}, respectively, were observed by 2010Kh06 from the decay of {+233}Cm 


level_energy_unit: KEV
level_lifetime_unit: S
level_comment:
J$J|p values of the ground states of {+237}Cf and {+233}Cm are expected to be the same from |a hindrance factor of |?1. From systematics trend, 2017Au03 suggested 3/2+ for g.s. of {+233}Cm 
T$from Adopted Levels, measured by 2010Kh06. 


level_energy_unit: KEV
level_spin_parity: 0+
level_lifetime_unit: S
level_comment:
T From 2002CaZZ 
%|a, %SF, and %|e+%|b{++} deduced by the evaluators from T{-1/2}=51 s {I12} and %|a/%SF=0.94 {I9} (2002CaZZ), and T{-1/2}(|e+|b{++})=240 s (theory, 1973Ta30). 


level_energy_unit: KEV
level_lifetime_unit: S
level_comment:
T$from recoil-|a-|a-|a(t) (2020Kh10) 
%A$from number of |a decays of {+235}Cm and {+239}Cf (2020Kh10) 


level_energy_unit: KEV
level_uncertain: S
level_comment:
|a branching of {+241}Cf to {+237}Cm has not been experimentally determined, but estimated by the evaluator as 14% {I7}. The assumption that the observed 7342-keV |a of {+241}Cf is a favored transition (therefore HF|<4.0) and its intensity is about 76% of |a decay yield %|a|>12.5. See {+241}Cf |a decay. 


level_energy_unit: KEV
level_energy_info: ;ERR=AP;ERR=?
level_comment:
E level energy is calculated from Q(|a)({+241}Cf)=7660 keV (2003Au03) and E|a=7342 keV ({+241}Cf |a decay). 


level_energy_unit: KEV
level_spin_parity: 0+
level_lifetime_unit: H
level_comment:
T$From 2006As03 a(t). Others: 2.5 h (1948St43) and 2.3 h (1952Hi63) 
|e/6520|a=240 {I50} from disintegration rate and |a decay rate (1952Hi63). 1952Hi63 believe that possible systematic errors in counting efficiency could reduce this value by a factor of 3 or 4. %|a is obtained from estimated %|a to g.s., from systematics of HF and relative I|a to 2+ sate in 234Pu. Revised E|a to 234Pu g.s. is 6558 {I10} (2006As03). %SF from ef-K| x ray coin (1994Kr03) 
T{-1/2}(|a) systematics for g.s.-to-g.s. transitions from even curium isotopes suggests that |a branching is about 5% 
Systematics of radius parameter r{-0} suggests that |a branching is about 4%. Large uncertainties on measured E(|a) and T{-1/2} give an upper limit of 10% for the |a branching. 


level_energy_unit: KEV
level_spin_parity: (7/2-)
level_lifetime_unit: H
level_comment:
T$Estimated by 2008Qi03 from 188.2|g(t). T{-1/2}=2.5 h {I4} from 188|g(t), Am K| x ray(t) (2002ShZS). Others: 3 h (1952Ca42) unpublished results, 2.9 h (1958Va37) unpublished results 
J$Nilsson orbital syst (1972El21) suggest 7/2[743]; The close lying 1/2[631] orbital is an unlikely assignment given the intense 188|g (deexciting the 5/2+ level in {+239}Am), which suggests that {+239}Cm populates the 188-keV (5/2+,5/2[642]) level. 
$No |a observed; %|a<0.001 (2008Qi03). In a private communication to 2008Qi03, 2002ShZS report three alpha events with an energy of 6.43 MeV {I14} assigned to {+239}Cm decay. 
$Other %|a<0.1 (1958Va37) T{-1/2}(|a)|?11 d (theory, 1997Mo25) gives %|a|?1. 
Assignment: {+239}Pu(|a,4n) (1952Ca42), parent of {+239}Am (1958Va37) 


level_energy_unit: KEV
level_energy_info: ;ERR=AP;ERR=?
level_spin_parity: (1/2+)
level_comment:
E$from E|a and syst value for Q(|a)({+243}Cf)=7420 (2012Wa38) (in {+237}Pu the analogous level lies at 145 keV above the 7/2-,7/2[743] state). 
J favored |a from 1/2[631] {+243}Cf. 


level_energy_unit: KEV
level_spin_parity: 0+
level_lifetime_unit: D
level_comment:
%|e<0.5 since no {+240}Am detected (1952Hi11) 
T$ average of 26.8 d (1949Se01) and 28 d (1967Ba42). T{-1/2}(SF)=1.9|*10{+6} y {I4} (1952Gh27) and recommended by 2000Ho27 


level_energy_unit: KEV
level_spin_parity: (2+)
level_lifetime_unit: PS
level_comment:
J$systematics of even-even nuclides 
T$ the value is as quoted by 2001Ra27 evaluation, based on recoil-distance method (1978Ul01) in {+239}Pu(|a,3n) E=27, 33 MeV, where Q{-0}=12.0 {I5} was deduced from measured percentage of highly charged {+240}Cm recoil ions as a function of the distance between target and a carbon catcher foil. From Q{-0}, 1978Ul01 deduced half-lives of 154 ps for 2+, 71 ps for 4+ and 41 ps for 6+ members of the ground-state band with an estimated feeding lifetime of 32 ps from higher members of the rotational band. The spectroscopic details of the work by 1978Ul01 are not available. 


level_energy_unit: KEV
level_energy_info: ;ERR=AP;ERR=?
level_lifetime_unit: NS
level_lifetime_info: ;ISO=M2
level_comment:
T$ fission isomer (1976Sl01); tentative assignment in {+238}Pu(|a,2n). Others: 10 ns-100 ns (1978Ul01), 1970Po01 


level_energy_unit: KEV
level_spin_parity: 1/2+
level_lifetime_unit: D
level_comment:
%A$I|a/(I|a+I|e)=0.010 {I1} from a measurement of Ice(145.536|g) in {+237}Pu following |a decay of {+241}Cm (1974Po08). Other: %|a=0.96 {I9} from absolute counting (1960Gl01). 
T$From least squares decay analyses of the 471.8 keV |g using a Ge(Li) detector. Others: 35 d (1952Hi11), 37 d (1967Ba42) 
J$HF=2.5 {I3} for |a decay to the 1/2+ 145.54 level in {+237}Pu with configuration 1/2[631] 


level_energy_unit: KEV
level_energy_info: ;ERR=?
level_spin_parity: (7/2+)
level_uncertain: ?
level_comment:
E,J$Possible 7/2+ member of the 1/2[631] band, but see the evaluator's comment in the {+245}Cf |a decay dataset 


level_energy_unit: KEV
level_energy_info: ;ERR=?
level_spin_parity: (9/2+)
level_uncertain: ?
level_comment:
E,J$Possible 9/2+ member of the 1/2[631] band, but see the evaluator's comment in the {+245}Cf |a decay dataset 


level_energy_unit: KEV
level_energy_info: ;ERR=AP;ERR=?
level_lifetime_unit: NS
level_lifetime_info: ;ISO=M1
level_comment:
%SF$Only SF decay observed. From calculations of T{-1/2} for SF and for T{-1/2} for |g decay (1972We09) one predicts the isomeric decay branch to be 1.3|*10{+-5}% 
E$From a fit to the {+239}Pu(|a,2n) excitation function, reported values are 2.3 MeV {I2} (1971Br39) and 2.6 MeV {I2} (1972Vy07). 1972We09 calculate 2.11 MeV 
T measured values and production methods: 20 ns {+239}Pu(|a,2n) (1969Me11); 19 ns {I8} {+241}Am(d,n) (1970Po01); 25 ns {I15} {+243}Am(p,3n) (1971Re11); 15.3 ns {I10} {+239}Pu(|a,2 n) (1971Br39 ); 20 ns {+239}Pu(|a,2n) (1972Ga42); 10 ns {I1} {+239}Pu(|a,2n) (1974SpZS ). 
$For theoretical calculations of T{-1/2}(SF) see, for example, 1978Po09, 1985Lo17, and 1990Bh02. 
${+239}Pu(a,2nf): fission fragment angular distributions were measured; spin and configuration assignments were proposed by 1974SpZS, 1974GaZD. See also 1975Kh06 for possible spins deduced from angular-distribution measurements of 1974SpZS. 
({+3}He,tF): fission probability was obtained from measured fission counts (singles) and the observed coincidences between fission fragments; barrier heights were deduced by 1976Ga11. Barrier parameters were also deduced by 1981Re06 from analysis of fission probability data of 1976Ga11. See 1972We09, 1980Ku14 and 1984Ku05 for calculated barrier parameters. 
{+238}Pu(|a,nF): |G(n)/|G(f) was deduced, compared with theory including pairing by 1973Me23. 


level_energy_unit: KEV
level_spin_parity: 0+
level_lifetime_unit: D
level_comment:
%SF$Deduced from the adopted T{-1/2}(SF); %{+34}Si was determined by 2000Og01. 
T$The measured values (in units of days) are 162.5 {I20} (1950Ha14), 162.46 {I32} (1954Gl37), 163.0 {I18} (1954Hu32), 162.7 {I1} (L.N.Treiman, R.A.Penneman, B.Bevan quoted in 1957Ho71), 163.2 {I2} (1975Ke02), 163.1 {I4} (1965Fl02, revised by 1977Di04), 162.76 {I8}, (1977Di04), 163.02 {I18} (1979Ch41), 161.35 {I30} (1981Us03), 163.17 {I11} and 162.82 {I26} (1982Ag02), 163.0 {I2} (1984Wi14). The uncertainties given for 1954Gl37, 1977Di04, 1979Ch41, 1981Us03, and 1982Ag02 are reassignments by 1986LoZT of the authors' original values. The evaluators consider the value of 1981Us03 to be an outlier. A weighted average of the other values is 162.877 {I63}. The evaluators adopt 162.88 {I8} where the uncertainty is the smallest of the input values. 
T{-1/2}(SF)=7.0|*10{+6} y {I2} is recommended by 2000Ho27 from measured partial half-lives of 7.2|*10{+6} y {I2} (1951Ha87), 6.82|*10{+6} y {I18} (1967Ar09, revised value; see 2000Ho27), 7.46|*10{+6} y {I6} (1979Ch41), 7.15|*10{+6} y {I15} (1982Ra33), 6.89|*10{+6} y {I17} (1982UmZZ), 6.98|*10{+6} y {I33} (1986Ze06; revised value; see 2000Ho27), 6.96|*10{+6} y {I18} (1989Us04). 
The partial half-life for {+34}Si decay was deduced by 2000Og01 as 1.4|*10{+23} s {I+5-3}. Their earlier results were reported in JINR-E7-93-57, p.48 (1993) and in 1997Tr17. 


level_energy_unit: KEV
level_energy_info: ;OFF=X
level_lifetime_unit: PS
level_lifetime_info: ;ISO=M1
level_comment:
Only SF decay observed. 100% SF branching is consistent with systematics of spontaneously fissioning isomer half-lives (see 1975Me28,1976Sl01). 
T measured by 1976Sl01. 
Assignment: {+240}Pu(|a,2n) E(|a)=26 MeV, {+243}Am(p,2n) E(p)=13 MeV (1976Sl01). 
Calculations of 1972We09 yield E=1.83 MeV, T{-1/2}=4.6 ps for the energy and half-life of the SF isomer. 


level_energy_unit: KEV
level_lifetime_unit: NS
level_lifetime_info: ;ISO=M2
level_comment:
T measured by 1971Re11. 
Assignment: {+240}Pu(|a,2n) excit (1971Br39), {+243}Am(p,2n) E(p)=20 MeV (1971Re11). 
It is not established whether the level decays by |g transition to the spontaneously fissioning 40-ps isomer, or by spontaneous fission (or both). 
E(level)=2.8 {I4} MeV deduced by 1973Br38 from threshold energy for production of the isomer through {+240}Pu(|a,2n) reaction. See also 1971Br39. 
From the anomalously high isomer excitation energy for the longer-lived isomer, 1971Br39 proposed that the longer-lived isomer was an excited state in the second potential well. 
1976Sl01 suggested that analogous to {+238}Pu, a two-quasiparticle isomeric state would be expected at about 1 MeV higher excitation energy than the 40-ps state. 


level_energy_unit: KEV
level_spin_parity: 5/2+
level_lifetime_unit: Y
level_comment:
$|m=0.40 {I8} (from 1973Ab03 with the uncertainty recommended by 2011StZZ) 
J$spin was measured by 1973Ab03 (electron paramagnetic resonance). Orbital assignments are from measured |m values and (d,t) data 
T$recommended by 1989Ho24 from weighted average of the revised values of 1986Ti03 and 1958Ch38. T{-1/2}=29.20 y {I12} obtained by 1986Ti03 from relative {+244}Cm and {+243}Cm |a activities using T{-1/2}({+244}Cm)=18.11 y {I2}. T{-1/2}=29.0 y {I8} obtained by 1958Ch38 from |a activities of {+243}Cm and {+244}Cm using T{-1/2}({+244}Cm)=18.4 y {I5}. A correction by the evaluators to the value of 1958Ch38 using the adopted T{-1/2}({+244}Cm)=18.1 y {I1} (2003Ak04) yields T{-1/2}({+243}Cm)=28.5 y {I8}. 
%EC$calculated by the evaluators from T{-1/2}(|e)=1.0|*10{+4} y {I1}, as obtained by 1958Ch38 from ratio of {+243}Am and {+243}Cm |a activities (correction for the adopted T{-1/2}'s of {+243}Am and {+243}Cm does not change the |e decay half-life), and from total half-life of 29.1 y {I1}. 
%SF$from T{-1/2}(SF)=5.5|*10{+11} y {I9}, measured by 1987Po19 from SF and |a activities, and total half-life of 29.1 y {I1}. 
MOMM1$estimated from EPR in 1973Ab03, relative to |m of {+241}Am. Compiled by 2011StZZ. 


level_energy_unit: KEV
level_spin_parity: 1/2+
level_lifetime_unit: US
level_comment:
J$E2 87.4|g to 5/2+; assignment in (d,t) 
T$from (K x-ray)(ce 87.4|g)(t) in {+243}Bk |e decay. 
E$from 87.4 {I1} |g-ray to ground state. 


level_energy_unit: KEV
level_spin_parity: 9/2+
level_comment:
E$assumed doublet consisting of the 9/2+ member of the 5/2[622] band and the 3/2+ member of the 1/2[631] band. 


level_energy_unit: KEV
level_spin_parity: (7/2+)
level_comment:
E$no K x-rays were observed in coincidence with the |a transition feeding the level. The level energy, therefore, must be less than the K-binding energy of 128 keV. E(level) is unweighted average of 133 keV {I4} in (d,t) and 95 keV {I16} in {+247}Cf |a decay derived from Q(|a) and measured E|a. 
J$unhindered |a decay from probable 7/2[624] ground state of {+247}Cf and assignment in (d,t). 


level_energy_unit: KEV
level_spin_parity: (9/2+)
level_comment:
E$other: 154 keV {I16} from Q(|a) and measured E|a in {+247}Cf |a decay. 
J$population in |a decay from the probable 7/2[624] ground state of {+247}Cf and assignment in (d,t) 


level_energy_unit: KEV
level_comment:
E$assumed doublet in (d,t) 
J$suggested J|p= (3/2-) and (5/2-) in (d,t) assuming doublet corresponds to the 3/2- and 5/2- members of the 1/2[501] band. 


level_energy_unit: KEV
level_lifetime_unit: NS
level_comment:
$Spontaneously fissioning shape isomer, only SF decay has been observed. 
T$from 1972Wo05. Measured values are: 45 ns (1969Me11), 38 ns {I10} (1970Po01), 45 ns {I20} (1971Re11), 40 ns (1972Ga42,1974GaZD), 42 ns {I6} (1972Wo07). 
$See 1977VaZW and 1980Bj02 for reviews of SF isomers. See also 1973PoZA for compilation of experimental half-lives. 
E$recommended by 1980Bj02. 
$E=1500 {I200} was deduced by 1973Br04 from {+242}Pu(|a,3n) excitation function and T{-1/2}(level) using a statistical model. Some calculated level energies are: E=1400 (1990Bh02), 1850 (1972We09), 2000 {I300} (1971Br39). 
$Assignment: {+243}Am(d,2n) (1970Po01,1971Re11); {+242}Pu(|a,3n) excit (1971Br39). 


level_energy_unit: KEV
level_spin_parity: (7/2+)
level_comment:
E$nonobservation of K x-rays in coincidence with |a's suggests that the level populated by the 6296-keV |a has an energy less than the K-binding energy of curium (128 keV). A level at 133 keV {I4} observed in the (d,t) reaction was tentatively assigned as the 7/2+, 7/2[624] state. This state is expected to be fed by the unhindered 6296-keV |a transition from the probable 7/2[624] ground state of {+247}Cf. The level energy here is from Q(|a)({+247}Cf)=6495 {I15} (2012Wa38) and E|a=6296 {I5}. 


level_energy_unit: KEV
level_spin_parity: 9/2+
level_comment:
$d|s/d|W=550 {I35} 
E$assumed doublet consisting of the 9/2+ member of the 5/2[622] band and the 3/2+ member of the 1/2[631] band. 


level_energy_unit: KEV
level_spin_parity: (3/2-) & (5/2-)
level_comment:
$d|s/d|W=174 {I17} 
E$assumed doublet consisting of the 3/2- and 5/2- members of the 1/2[501] band. 


level_energy_unit: KEV
level_spin_parity: 1/2+
level_lifetime_unit: US
level_comment:
CONF$|n1/2[631] Nilsson orbital. Decoupling parameter of a=-0.657 {I4} and rotational constant of A=6.60 {I2} keV can be obtained from the assigned band, which are in good agreement for the same configuration observed in the neighboring {+241}Pu isotope 


level_energy_unit: KEV
level_spin_parity: 1/2+
level_comment:
CONF$|n1/2[620] Nilsson orbital. Decoupling parameter of a=+0.447 {I5} and rotational constant of A=6.91 {I2} keV can be obtained from the assigned band, which are in good agreement for the same configuration observed in the neighboring {+241}Pu isotope 


level_energy_unit: KEV
level_spin_parity: 0+
level_lifetime_unit: Y
level_comment:
$%SF is deduced from the adopted total and partial half-lives. 
$The measured |a/SF activity ratios are |a/SF=743|*10{+3} {I1} (1965Me02), 742.0|*10{+3} {I35} (1972Ha80); 697.7|*10{+3} {I14} (1993Pa29). 
T$Weighted average of 17.9 y {I5} (1954Fr19; |a activity relative to {+242}Cm (this half-life will not change when the adopted T{-1/2}{+242}Cm= 162.88 d {I8} from email reply by M. Martin on 12 July 2017 is used), 18.099 y {I32} (1968Be26; 2|p |a counting; uncertainty was revised by 1989Ho24), 18.13 y {I4} (1972Ke29; calorimetry), 18.24 y {I25} (1982Po14; specific activity; revised by 1984Ho24). Other T{-1/2} measurements that were not included in the weighted average due to their large contribution to the chi-square: 19.2 y {I6} (1954St33; activity relative to {+242}Cm), 17.59 y {I6} (1961Ca01; specific activity) 
$T{-1/2}(SF)=1.32|*10{+7} y {I2} as recommended by 2000Ho27 is the weighted average of 1.4|*10{+7} y {I2} (1952Gh27; revised by 2000Ho27), 1.46|*10{+7} y {I6} (1963Ma56; gas scintillator), 1.346|*10{+7} y {I6} (1965Me02; from |a/SF counts), 1.33|*10{+7} y {I3} (1967Ar09; LiI scintillator), 1.250|*10{+7} y {I7} (1970Ba11), low geometry fission counter), 1.343|*10{+7} y {I6} (1972Ha80; from |a/SF counts), 1.263|*10{+7} y {I25} (1993Pa29; from |a/SF counts). 


level_energy_unit: KEV
level_spin_parity: 2+
level_lifetime_unit: PS
level_comment:
T$Measured by 1962Ch19 in the 10.1-h {+244}Am beta decay using the delayed coincidence technique between |g rays and conversion electron lines. T{-1/2}= 126.1 ps {I17} is calculated by the evaluator from B(E2)=14.58 {I19} measured in Coulomb excitation. 
J$42.965|g to gs is E2. 


level_energy_unit: KEV
level_spin_parity: (2+)
level_uncertain: ?
level_comment:
$This level is tentatively assigned. An alternate placement of the 977.796-keV transition would be to de excite a 977.8-keV 0+ level to the ground state (1984Ho02). 
J$977.796|g to 2+ state is E0(+M1+E2). 1984Ho02 proposed this level to be 2+ member of a K=0 band based on 984.9-keV level. 


level_energy_unit: KEV
level_spin_parity: 6+
level_lifetime_unit: MS
level_lifetime_info: ;ISO=M1
level_comment:
E$Probable Nilsson assignment is 6+,(|n 5/2[622]+ |n 7/2[624]). In this case, the beta branch from 10.1-hour {+244}Am would involve a transformation of the |n 5/2+[622] state to the |p 5/2-[523] state, as also suggested by 1962Va08. 
J$897.848|g to 4+ level is E2, 538.400|g decay to 8+ level is (E2) J=6 was also confirmed by the angular correlation measurement in the 10.1-h {+244}Am |b decay by 1963Ha29 
T$Measured by 1963Ha29 in 10.1-h {+244}Am beta decay by delayed coincidence between |b particles and conversion electrons 
$T{-1/2}(SF)>140 y (1964Va04). The authors attributed their observed SF activities to the {+244}Cm ground state SF decay. 


level_energy_unit: KEV
level_spin_parity: (1,2)
level_uncertain: ?
level_comment:
J$Gamma transitions to 0+ and 2+ states 
$See {+244}Am |b- decay (26-min) data set for comments on the multipolarities of these transitions. 


level_energy_unit: KEV
level_energy_info: ;OFF=X
level_lifetime_unit: NS
level_lifetime_info: ;ERR=GT;ISO=M2
level_comment:
E LEVEL ENERGY HELD FIXED IN LEAST-SQUARES ADJUSTMENT 
T$T{-1/2}(SF)>500 ns (1969MeZX). 
$Only SF decay observed (1969MeZX). 
$From fit to the experimental excitation function for {+242}Pu(|a,2n) reaction, 1971Br39 calculated E(level)=3.7 MeV {I3} with T{-1/2}SF>100 ns. In a later evaluation, 1973Br38 calculated the level energy as 3.0 MeV {I4} which is believed to be an excited state at the shape isomeric deformation. No recommended level energy was given in the review work by 1980Bj02. 
$No resonance structure was observed by 1973Ba55 nor 1974Ba28 for {+244}Cm in the {+243}Am({+3}He,dF) reaction. Estimate for the fission barrier was made from theoretical model fit to their measured fission probabilities as a function of excitation energy. 1976Ga11 deduced fission barrier heights and widths for neutron/fission from their {+243}Am({+3}He,dF) data. 


level_energy_unit: KEV
level_energy_info: ;OFF=Y
level_lifetime_unit: PS
level_lifetime_info: ;ERR=LE;ISO=M3
level_uncertain: S
level_comment:
E LEVEL ENERGY HELD FIXED IN LEAST-SQUARES ADJUSTMENT 
T$No short lived fission activity was observed by 1976Sl01 following the {+242}Pu(|a,2n) reaction; an upper limit for half-life was set from their lower limit on the ratio of isomer to prompt fission. From the correlation between isomers' half-lives and the fission barriers, the authors predicted 1 - 50 ps half-lives for the second fission isomer in the even-even curium isotopes. 
$For a systematics of fission isomer half-lives see 1975Me28 


level_energy_unit: KEV
level_spin_parity: 6+
level_lifetime_unit: MS
level_lifetime_info: ;ISO=M
level_comment:
T$From decay curve measurements in delayed coincidence between |b particles and conversion electrons (1963Ha29) 


level_energy_unit: KEV
level_spin_parity: (2+)
level_uncertain: ?
level_comment:
E$This level is tentatively assigned. An alternate placement of the 977.796-keV transition could be to de excite a 977.796-keV 0+ level to the ground state (1984Ho02). 


level_energy_unit: KEV
level_spin_parity: (4)
level_uncertain: ?
level_comment:
E$Expected to have the largest direct feeding |?40 % by |e-decay (2014So17) based on large intensity of the 217.3|g decay 


level_energy_unit: KEV
level_spin_parity: 2+
level_comment:
$T{-1/2}(42.957 level)=126.1 ps {I17} is calculated by the evaluator from B(E2)=14.58 {I19}. The conversion coefficient of |a(42.965|g)=1050 is used in calculation. T{-1/2}=97 ps {I5} was measured in 10.1-h {+244}Am |b decay by 1962Ch19 


level_energy_unit: KEV
level_energy_info: ;ERR=?
level_spin_parity: (1-)
level_comment:
E,J$proposed by 2019Tr05. Spin and parity is suggested by comparable intensities of 940.5|g and 983.5|g (2019Tr05) 


level_energy_unit: KEV
level_spin_parity: 7/2+
level_lifetime_unit: Y
level_comment:
J$Spin from measured paramagnetic resonance (1970Ab03). Parity from Nilsson orbital assignment which is in agreement with calculation using quasiparticle-phonon model (2015Sh07) and the projected shell model (2016Sa20) 
MOMM1$Electron Paramagnetic Resonance (1970Ab03,2019StZV) 
$rms charge radius <r{+2}>{+1/2}=5.848 fm {I18} (2013An02) 
T$From weighted average of 8245 y {I70} (2009KoZV, 2008KoZP), 8445 y {I100} (1982Po14), 8532 y {I53} (1971Ma32), and 8265 y {I180} (1969Me01). Other evaluated values: 8250 {I70} (2012Ch30), 8480 y {I60} (1989Ho24), 8500 y {I200} (1986LoZT). Earlier measurements: 1961Ca01, 1955Br02, 1954Fr19, 1954Hu50 
$T{-1/2}(SF)=1.4|*10{+12} y {I2}, measured by 1985Dr10 and recommended by 2000Ho27,1989Ho24 Theoretical calculations of T{-1/2}(SF): 9.5|*10{+12} y (2005RoZS). Others: 1978Po09, 1990Bh02, 2005Re16. 
$%SF is deduced by the evaluator from the adopted total and partial half-lives. 


level_energy_unit: KEV
level_spin_parity: 9/2+
level_lifetime_unit: NS
level_lifetime_info: ;ERR=LE
level_comment:
J$M1 240.9|g from 7/2+ 295.7-keV level; band member; from L transfer in {+246}Cm(d,t),{+244}Cm(d,t) 
T$From |a|g(t) in the decay of {+249}Cf (1972An08). 


level_energy_unit: KEV
level_spin_parity: 1/2+
level_lifetime_unit: US
level_lifetime_info: ;ISO=M
level_comment:
J$M1 385.6|g from (1/2+) 740.9-keV level; band member; from L transfer in {+246}Cm(d,t),{+244}Cm(d,t) 
T$From |g-ce delayed coincidence method in the decay of {+245}Bk (1975Ya03) 


level_energy_unit: KEV
level_spin_parity: 9/2-
level_lifetime_unit: NS
level_comment:
J$(E1) 388.15|g to 7/2+ g.s.; E1+M2 266.6|g to 11/2+ 121.6-keV level 
T$From |a|g(t) in the decay of {+249}Cf (1972An08). 


level_energy_unit: KEV
level_spin_parity: 11/2+
level_comment:
J$65.95|g to 9/2+ 350.6-keV level; 356|g from (11/2-) 771-keV level; band member; from L transfer in {+246}Cm(d,t),{+244}Cm(d,t) 


level_energy_unit: KEV
level_spin_parity: (3/2)-
level_comment:
J$E1 380.8|g to 5/2+ 252.8-keV level; no |g to 7/2+ 295.7-keV level; log{Ift}= 7.1 for |e branch from 3/2- excludes 7/2- 


level_energy_unit: KEV
level_spin_parity: 7/2-
level_comment:
J$M1(+E2) 255.47|g to 9/2- 388.2-keV level; large HF in |a decay from 9/2- parent excludes 9/2-; systematics of the experimental and calculated bandhead energies with the 7/2-[743] assignment in N=149 isotones: {+245}Cm, {+247}Cf, {+249}Fm (2012Zh01) 


level_energy_unit: KEV
level_spin_parity: (11/2-)
level_comment:
J$421.0|g to 9/2+ 350.6-keV level; 650.3|g to 11/2+ 121.6-keV level; band member; from L transfer in {+246}Cm(d,t),{+244}Cm(d,t) 


level_energy_unit: KEV
level_lifetime_unit: NS
level_lifetime_info: ;ISO=M1
level_comment:
E$Recommended in 1990Bh02. 
T$13.2 ns {I18} (1972Wo07), 23 ns {I5} (1971Br39). 13.2 ns {I18} recommended in 1973Br38, 13 ns {I2} in 1990Bh02. 


level_energy_unit: KEV
level_spin_parity: 0+
level_lifetime_unit: Y
level_comment:
T$From ingrowth activity method (2007Ko01). The evaluator is adopting the value from 2007Ko01 as the measurement uses a high-purity source and the absolute efficiencies are not needed as the half-life is determined from the activity ratio of the daughter {+246}Cm to the parent {+250}Cf. The T{-1/2}({+250}Cf)=13.08 y {I9} used by 2007Ko01 is the current value available in the ENSDF database (2001Ak11) Earlier measurements as specified in "Others" either used the absolute or specific activity methods with exception to 1955Br02 and 1956Bu91. The latter two used the ingrowth method but had very discrepant results. Others: 4852 y {I76} (1977Po20), 4820 y {I20} (1971Ma32) 4654 y {I40} (1971Mc19), 4711 y {I22} (1969Me01), 5480 y {I170} (1961Ca01), 6620 y {I320} (1956Bu91), 2300 y {I460} (1955Br02), 4000 y {I600} (1954Fr19) 
%SF,%A$From |a/SF= 3823 {I10}: weighted average of |a/SF=3822 {I10} (1969Me01), 3833 {I32} (1971Ma32). Spontaneous fission rate=9000 {I700} fission /mole (1981Gi02). 


level_energy_unit: KEV
level_spin_parity: 2+
level_lifetime_unit: PS
level_comment:
J$E2 42.852|g to 0+ g.s.; band member 
T$From B(E2)=14.94 {I19} measured in Coulomb excitation and |a=1064 {I15} 


level_energy_unit: KEV
level_spin_parity: 2-
level_comment:
J$E1 798.79|g to 2+ 43-keV level; (M1,E2) 34.8|g from 3- 876-keV level; no gamma from 5- 980-keV level 


level_energy_unit: KEV
level_spin_parity: 5-
level_comment:
J$natural parity yields negative parity for J=5 (observed in (d,d')); 685.1|g to 6+ 295-keV level; 838.5|g to 4+ 143-keV level; band member 


level_energy_unit: KEV
level_spin_parity: 8-
level_lifetime_unit: S
level_lifetime_info: ;ISO=M
level_comment:
J$E2 127.4|g to 6- 1051-keV level; 679.2|g to 8+ 499-keV level; calculated from Woods-Saxon single-particle energies (2008Ro21) and Gogny interaction (2006De23); systematics of N=150 isotones ({+244}Pu, {+248}Cf, {+250}No) 
$Configuration=7/2[624]~#9/2[734] (2019Sh34) 
$Identified as K|p=8- isomer (1973Mu03) 
T$from summed double coincidence intensities of 679|g, 153|g, 205|g(t) in ({+209}Bi,{+211}Bi|g) (2019Sh34) 


level_energy_unit: KEV
level_spin_parity: 1-
level_comment:
J$E1 1206.96|g to 2+ 43-keV level; natural parity yields negative parity for J=1 (observed in (d,d')) 


level_energy_unit: KEV
level_spin_parity: 3-
level_comment:
J$1257.62|g to 2+ 43-keV level; 1158.47|g to 4+ 142-keV level; natural parity yields negative parity for J=3 (observed in (d,d')); band member 


level_energy_unit: KEV
level_spin_parity: 3-
level_comment:
J$E1 401.68|g to 2+ 1124-keV level; 1383.94|g to 4+ 142-keV level; natural parity yields negative parity for J=3 (observed in (d,d')) 


level_energy_unit: KEV
level_spin_parity: 3+
level_comment:
J$1813.73|g to 2+ 43-keV level; 1714.61|g to 4+ 142-keV level, level not seen in (d,d') suggests a level with unnatural parity. 


level_energy_unit: KEV
level_spin_parity: 2+,3
level_comment:
J$1759.30|g to 4+ 143-keV level; 1858.7| g to 2+ 43-keV level; log{Ift}= 8.28 from J|p({+246}Am)=2(-) rules out 4+ 


level_energy_unit: KEV
level_spin_parity: 8-
level_lifetime_unit: S
level_lifetime_info: ;ISO=M
level_comment:
T$from summed double coincidence intensities of 679|g, 153|g, 205|g(t) (2019Sh34) 
$Configuration=7/2[624]~#9/2[734] (2019Sh34) 


level_energy_unit: KEV
level_spin_parity: 9/2-
level_lifetime_unit: Y
level_comment:
MOMM1$From electron paramagnetic resonance measurement (1973Ab03). Compiled by 2011StZZ. 
J$Spin measured by 1973Ab03 (electron paramagnetic resonance) and parity determined from the measured magnetic dipole moment and Nilsson diagram. 
T$Measured by 1971Fi01. This half-life is recommended by 1989Ho24. Earlier measurement: 1.64|*10{+7} y {i24} (1963Fi08). 


level_energy_unit: KEV
level_uncertain: ?
level_comment:
J$3/2+,1/2[620] state was tentatively assigned by 1971Br27 from (d,t) data. This state was observed at 433 keV in {+251}Cf |a decay. 


level_energy_unit: KEV
level_spin_parity: (9/2+)
level_comment:
$Level was assumed doublet in the (d,p),(d,t) reactions, and the other member was assigned to the 5/2+,3/2[622] state by 1971Br27. 


level_energy_unit: KEV
level_spin_parity: 0+
level_lifetime_unit: Y
level_comment:
T$recommended by 1989Ho24 from a weighted average of 3.52 {I4} (1969Me01), 3.60 {I4} (1971Ma32), and 3.40 {I3} (1971Mc19) in units of 10|*10{+5} y. 
$T{-1/2}(SF)=4.15|*10{+6} {I3} is recommended by 2000Ho27 from a weighted average of 4.22 {I12} (1969Me01), 4.20 {I5} (1971Ma32), and 4.11 {I3} (1971Mc19) in units of 10|*10{+6} years 
%A,%SF$from the adopted values for T{-1/2} and T{-1/2}(SF) 


level_energy_unit: KEV
level_energy_info: ;ERR=?
level_spin_parity: 0+
level_comment:
J L=0 in {+248}Cm(t,p) reaction. From the strong population of the 0+ level in (t,p) reaction, 1977Fl06 proposed that the level is a two-particle two-hole-pair vibrational state. 


level_energy_unit: KEV
level_spin_parity: 0+
level_comment:
$Population of {+248}Cm g.s. was observed to be 1.6 times stronger than the {+246}Cm g.s. population in (t,p) reaction. 


level_energy_unit: KEV
level_energy_info: ;ERR=?
level_spin_parity: 0+
level_comment:
$Large cross section for the 1084-keV level was observed. The strength was 36% of that for the g.s. (1977Fl06). This level was interpreted by 1977Fl06 as a two-particle two-hole-pair vibrational state. 


level_energy_unit: KEV
level_energy_info: ;ERR=?
level_spin_parity: 2+
level_lifetime_unit: PS
level_comment:
E LEVEL ENERGY HELD FIXED IN LEAST-SQUARES ADJUSTMENT 
$B(E2)=14.99 {I19} (1973Be44). An earlier value of 15.0 {I6} from this same group was published in 1971Fo17. Other: 13.7 {I9} (1986Cz02) 


level_energy_unit: KEV
level_spin_parity: 1/2+
level_lifetime_unit: MIN
level_comment:
J$from (d,p) measurements by 1971Br27 based on DWBA analysis of cross sections, Nilsson level systematics for N=153 isotones ({+251}Cf, {+253}Fm, {+255}No) and calculated bandhead energies using the cranked shell model with the pairing correlations (2012Zh01) 
%B-$No |a decay observed. Calculated T{-1/2}(|a)|?1|*10{+8} d (2019Mo01) 
T$from 1973DrZM. No details have been provided by 1973DrZM. Prior evaluations in Nuclear Data Sheets (2011Ab07, 1999Ar21, 1990Sc03, 1981Sc22, 1976Sc09) have cited an incorrect reference. Other: 64 min {I3} (1958Ea06), 64.3 min {I6} (1975HoZA). It is noted that the evaluator is unable to verify this value. 


level_energy_unit: KEV
level_spin_parity: (7/2+)
level_lifetime_unit: US
level_lifetime_info: ;ERR=?;ISO=M
level_comment:
J$from favored |a decay from (7/2+) {+253}Cf 
T$from delayed coin (1966As12). It is noted that the evaluator is unable to verify this value as this private communication is not available. 


level_energy_unit: KEV
level_spin_parity: 3/2+
level_comment:
J$J=1/2 or 3/2 from being populated by primary gamma (4505.0|g). 159.215|g to (7/2+) 48.774-keV level and from (d,p) measurements by 1971Br27 based on DWBA analysis of cross sections and band member 


level_energy_unit: KEV
level_spin_parity: 9/2+
level_comment:
J$from (d,p) measurements by 1971Br27 based on DWBA analysis of cross sections, and band member 
E$from (d,p). Other: 350 {I5} from (|a,{+3}He) 


level_energy_unit: KEV
level_spin_parity: (11/2-)
level_lifetime_unit: NS
level_comment:
J$E1 265.7|g to (9/2+) 109.55-keV level, 182.89-keV level, and configuration 11/2[725] 
$Configuration=11/2[725] 
T$Weighted average of 18.7 ns {I9} from (particle)(266|g)(t) and 23 ns {I2} from (particle)(193|g)(t) in the one-neutron stripping reaction {+248}Cm({+16}O,{+15}O|g) (2008Is05) 


level_energy_unit: KEV
level_spin_parity: 3/2-
level_comment:
J$from (d,p) measurements by 1971Br27 based on DWBA analysis of cross sections, 470.197|g to 1/2+ g.s. 


level_energy_unit: KEV
level_spin_parity: (1/2-,3/2-)
level_comment:
J$J=1/2 or 3/2 from being populated by primary gamma (4219.0|g). Intense primary gammas are often E1 transitions (1982Ho07) 


level_energy_unit: KEV
level_spin_parity: (5/2-)
level_comment:
J$257.74|g to 7/2+ 289.09-keV level, 76.64|g to 3/2- 470.207-keV level, 339.23|g to 3/2+ 208.001-keV level, band member 


level_energy_unit: KEV
level_spin_parity: (3/2-)
level_comment:
J$772.80|g to 1/2+ g.s., configuration from calculation with Coriolis interaction by 1982Ho07, consistent with rotational parameter A=8.0 


level_energy_unit: KEV
level_spin_parity: (7/2-)
level_comment:
J$band member. This state is expected to be populated strongly by the (d,p) reaction as suggested by the authors in 1982Ho07 


level_energy_unit: KEV
level_spin_parity: (1/2-)
level_comment:
J$J=1/2 or 3/2 from being populated by primary gamma (3796.1|g). Band head energy assigned by 1982Ho07 based on calculated excitation energy of the odd-neutron configuration 1/2-[501] for {+243}Cm, {+245}Cm, {+247}Cm and {+249}Cm by 1971Ga20 
$Configuration=1/2-[501] 


level_energy_unit: KEV
level_spin_parity: (5/2+,7/2+,9/2+)
level_lifetime_unit: PS
level_lifetime_info: ;ERR=LT
level_comment:
J$(M1) 981.1|g to (7/2+) 48.199-keV level 
T$From estimated lifetime by 2008Is05 to be much shorter than 2 ps stopping time of the Doppler-shifted 981|g in the thick target backing in the {+248}Cm({+18}O,{+17}O|g) 


level_energy_unit: KEV
level_spin_parity: (13/2+)
level_comment:
J$from {+248}Cm({+4}He,{+3}He) (2009Ah03) 
$Configuration=1/2[880] (2009Ah03) 
E$weighted average of 1353 {I7} from (d,p) and 1360 {I5} from (|a,{+3}He) 


level_energy_unit: KEV
level_spin_parity: 1/2+
level_uncertain: S
level_comment:
E$Neutron capture state. E=S(n)= 4713.37 keV {I25} (2021Wa16) is in agreement with the deduced value of 4713.7 keV {I4} by 19802Ho07 
J$from s-wave capture on the 0+ target, J{+|p}=1/2+ or 3/2+; no gammas to levels with J>5/2 


level_energy_unit: KEV
level_spin_parity: (7/2+)
level_lifetime_unit: US
level_lifetime_info: ;ERR=?;ISO=M
level_comment:
T$From delayed coin (1966As12). It is noted that evaluator is unable to verify this value as this private communication is not available. 


level_energy_unit: KEV
level_spin_parity: 1/2+
level_uncertain: S
level_comment:
E LEVEL ENERGY HELD FIXED IN LEAST-SQUARES ADJUSTMENT 
E$Neutron capture state. E=S(n)=4713.37 keV {I25} (2021Wa16) 


level_energy_unit: KEV
level_spin_parity: 11/2-
level_lifetime_unit: NS
level_comment:
T$Weighted average of 18.7 ns {I9} from (particle)(266|g)(t) and 23 ns {I2} from (particle)(193|g)(t) (2008Is05) 


level_energy_unit: KEV
level_spin_parity: (9/2+)
level_lifetime_unit: PS
level_lifetime_info: ;ERR=LT
level_comment:
T$From estimated lifetime by 2008Is05 to be much shorter than 2 ps stopping time of the Doppler-shifted 981|g in the thick target backing 


level_energy_unit: KEV
level_spin_parity: 0+
level_lifetime_unit: Y
level_lifetime_info: ;ERR=AP
level_comment:
Only SF decay has been observed. Spontaneous fission half-life was measured: T{-1/2}(SF)=17.4|*10{+3} y {I24} (1966Rg01); 11.3|*10{+3} y {I5} (1967Me16). Other measurement: 20|*10{+3} y (1957Hu76). T{-1/2}(SF)=11.3|*10{+3} y {I5} is recommended by 1989Ho24 and 2000Ho27. 
Any probable |a and |b{+-} decay branchings may Be deduced from estimated partial half-lives (see below): if T{-1/2}(|a)=45.5|*10{+3} y {I7} and T{-1/2}(|b{+-})|?106|*10{+3} y, then, by using T{-1/2}(SF)=11.3|*10{+3} y, the total half-life and decay branchings are calculated as T{-1/2}|?8.3|*10{+3}, and %SF|?74, %|a|?18, %|b{+-}|?8. 
From absence of {+250}Cf in debris of a thermonuclear explosion test, 1956Fi11 deduced that either {+250}Cm is stable against |b decay or its |b half-life is >130 y. 
Because of the available Q(|b{+-})({+250}Cm)=37 {I11}, any |b transition from {+250}Cm should populate only the 2- g.s. of {+250}Bk. Requirement of log| {If{+1u}t}|>8.5 yields T{-1/2}(|b{+-})|>6.7|*10{+3} y. If log| {If{+1u}t}|?9.7, as it is for the {+250}Bk |b{+-} decay to {+250}Cf g.s., then T{-1/2}(|b{+-})|?106|*10{+3} y. 
From r{-0} systematics (see 1998Ak04), r{-0}=1.515 {I5} is estimated; by using this r{-0} parameter, Q(|a)({+250}Cm)=5269 {I19} (from 1995Au04), I|a(unobserved 5086|a; g.s. to g.s.)=85 {I15} per 100 |a decays [from systematics I|a(to g.s.)/I|a(to 2+) for the region], and by requiring that HF(5086|a)=1.0, the partial |a decay half-life of {+250}Cm is calculated as T{-1/2}(|a)=45.5|*10{+3} y {I7}. 
For a systematic study of spontaneous fissioning nuclei, see, for example, 1997Ro12. 
The kinetic energy distribution of fission fragments were measured by 1973Ho02. 


level_energy_unit: KEV
level_spin_parity: 2+
level_comment:
J hindrance factor (2.9) for the 5791|a from {+254}Cf; energy systematics of 2+ levels in nearby even-A californium isotopes. 


level_energy_unit: KEV
level_spin_parity: 2+
level_comment:
E LEVEL ENERGY HELD FIXED IN LEAST-SQUARES ADJUSTMENT 
E$ deduced from fit of rotational frequencies to kinetic moment of inertia (Harris expansion) 


level_energy_unit: KEV
level_spin_parity: (1/2+)
level_lifetime_unit: MIN
level_comment:
T$From 1978Lo13. 
%B-$No |a decay expected; calculated T{-1/2}(|a)|?1|*10{+12} min (2019Mo01). Calculated T{-1/2}(SF)|?5|*10{+4} min (1985Lo17). 


level_energy_unit: KEV
level_spin_parity: 0+
level_lifetime_unit: D
level_lifetime_info: ;ERR=LT
level_uncertain: ?
level_comment:
E$indirectly deduced from the detection of {+252}Cf (T{-1/2}=2.647 y) in the debris of a thermonuclear test (1960Di03, 1966Rg01) 
%B-$expected to be the dominant decay mode of {+252}Cm, considering the theoretical half-life for |a decay is 10{+13.6} s (2019Mo01) 
T$estimated by 1966Rg01 from absence of {+252}Cm in the debris of two thermonuclear tests analyzed in mass spectrometric measurements. 
$Theoretical |b decay T{-1/2} > 100 s (2019Mo01) 


level_energy_unit: KEV
level_lifetime_unit: S
level_comment:
$From theoretical |a and |b decay half-lives of 4.6 s and 9.5 s, respectively in 2019Mo01, |a decay is expected to be 68%, and |e+|b{++} decay as 32%. 
E$detected |a activity is assumed to correspond to the g.s. of {+233}Bk 
J$3/2- from |W(proton)=3/2- in theoretical calculations (2019Mo01) 
T$from measured correlation times of |a-decay and reaction products (2015De22). 
$In a correlated chain (2015De22) starting with {+233}Bk, measured E|a=7.77 MeV {I2} and T{-1/2}=21 s {I+48-17} was followed by three correlated events: E|a=8.00 MeV {I2}, T{-1/2}=6.4 ms {I+149-54} assigned to {+229}Am decay); E|a=16.6 MeV, T{-1/2}=3.8 ms {I+76-27} (pileup event from {+225}Np and {+221}Pa decays); E|a=6.75 MeV {I2}, T{-1/2}=110 s {I+250-90} (assigned to {+213}Fr decay). No event was seen from {+217}Ac, possibly due to its short half-life 


level_energy_unit: KEV
level_energy_info: ;OFF=X
level_lifetime_unit: S
level_comment:
T$Deduced by 2016Ka13 from eleven {+234}Bk |a-decay events to {+230}Am. Identified E|a=7960 keV {I20}, 7860 keV {I20}, 7760 keV {I20}, and 7620 keV {I20} from {+234}Bk. Measured half-life appears to be the shorter one between two, reported earlier by the same research group in 2003MoZT (Proc. Frontiers of Collective Motion, Aizu, Japan, November 2002, H.Sagawa and H.Iwasaki, eds., p.140) of lifetime 65 s and 339 s. 


level_energy_unit: KEV
level_spin_parity: (4+,6-)
level_lifetime_unit: S
level_comment:
%EC,%A$from 2017Ko02 based on {+240}Es |a decay only correlated to {+236}Cm |a decay with no observation of {+240}Es and {+236}Bk |a-|a correlation, however, as pointed out in 2020Po07, events assigned as {+213}Rn |a decay in fig.4(c) of 2017Ko02 could be {+236}Bk |a decay. As a result, %|a and %|e are deduced by evaluator based on total 12 {+240}Es |a-decay events correlated with 10 {+236}Cm |a-decay events and 2 {+236}Bk |a-decay events. 
J$from systematics with |p3/2[521] (f{-7/2}) and |p7/2[633] orbitals expected to be near the proton Fermi surface for Z=97 and |n5/2[752] (j{-15/2}) near the neutron Fermi surface for N=139 resulting in two possible configurations |p3/2[521]~#|n5/2[752] or |p7/2[633]~#|n5/2[752] for the ground state. Tentative assignments of K|p=4+ or K|p=6- based on the Gallagher-Moszkowski rule. 
T$from Er-|a-fission(t) (2017Ko02). Other: |? 19 s (2020Po07, from two recoil-|a events). 


level_energy_unit: KEV
level_spin_parity: (1)
level_comment:
E$from difference in energies of two |a's from {+240}Es 
J$tentative assignments of K|p=1+ or K|p=1- based on the Gallagher-Moszkowski rule for configurations |p3/2[521]~#|n5/2[752] or |p7/2[633]~#|n5/2[752]; or K|p=1+ based on the |a decay with HF=2 from {+240}Es K|p=(1+) g.s. state with configuration |p7/2[633]~#|n5/2[633] as proposed in the Adopted Levels of {+240}Es. 


level_energy_unit: KEV
level_comment:
$Decay modes and half-life are unknown experimentally. From theoretical calculations in 2019Mo01, T{-1/2}(|b decay)=71 s, and T{-1/2}(|a)=832 s, which suggests %|e+|b{++}=92, %|a=8. 


level_energy_unit: KEV
level_lifetime_unit: S
level_comment:
%|e+%B: No |a branch was observed (1994Kr03) 
T$from 1994Kr03. Other: T{-1/2}|?2 Min (1994La25) 
1994Kr03 and 1994La25 observed delayed fission with probability 4.8|*10{+-4} {I20} (1994Kr03). 


level_energy_unit: KEV
level_spin_parity: (3/2-,7/2+)
level_comment:
T decay of {+239}Bk was not detected. T{-1/2}|?100 s from systematics and theory (2010An08). No a nor SF observed (2010An08) 
$Partial half-life estimates are: T{-1/2}(|a)|?115 h (1997Mo25), T{-1/2}(|e)|?12 min (1973Ta30). 
J$J|p=3/2- or 7/2+ depending upon whether {+243}Es g.s. J|p is 7/2+ or 3/2- respectively. From syst 3/2[521] or 7/2[633] are the expected low-lying states. |a HF suggests that 7/2+ is the g.s. (the HF for 7/2[633] to 3/2[521] should be a factor 4 bigger than the HF for 3/2[521]. to 7/2[633] transition because of phase space considerations). 


level_energy_unit: KEV
level_spin_parity: (7/2+,3/2-)
level_comment:
J$J|p=7/2+ or 3/2- depending upon whether {+243}Es g.s. J|p is 7/2+ or 3/2-, respectively. 
J$ Configuration=7/2+[633] or 3/2-[521] 


level_energy_unit: KEV
level_lifetime_unit: MIN
level_comment:
T$ from 1983Ga05 other: 5 min {I2} (1980Ga07). %|e|?100, as adopted by 1980Ga07, but systematics (1972El21,2003Au02) suggest 10% for |a decay. |b{++} or |e decays were not observed. 2001Mo07 calculated T{-1/2} for |a-decay as 37.5 h 


level_energy_unit: KEV
level_comment:
E calculated from the observed E|a=7570 {I20} from {+244}Es |a-decay (1973Es02) and Q(|a)({+244}Es)=7940 {I100} (syst,2003Au03) 


level_energy_unit: KEV
level_comment:
E calculated from the observed E|a=7570 {I20} from {+244}Es and Q(|a)({+244}Es)=7940 {I100} (syst,2003Au03). 


level_energy_unit: KEV
level_lifetime_unit: MIN
level_comment:
%EC+%B+$$ Only the |e+|b{++} decay mode has been observed. No |a or SF activities were identified: %|a<1, %SF<0.03 (1979Wi03). 
T measured by 1979Wi03. 


level_energy_unit: KEV
level_energy_info: ;OFF=X
level_lifetime_unit: NS
level_comment:
Only SF decay has been observed. 
T measured by 1972Wo07. 
Assignment: {+241}Am(|a,3n) excit (1972Wo07). 


level_energy_unit: KEV
level_energy_info: ;OFF=Y
level_lifetime_unit: NS
level_comment:
Only SF decay has been observed. 
T measured by 1972Wo07. Other measurement: 1972Ga42. 
Assignment: {+241}Am(|a,3n) excit (1972Wo07). 


level_energy_unit: KEV
level_spin_parity: (3/2-)
level_lifetime_unit: H
level_comment:
T$from 1950Th52. Others: 4.5 h {I1} (1953Hu60), 4.5 h {I3} (1956Ch77); note that both are unpublished reports. 
J$analogy with {+245}Bk suggests 3/2-,3/2[521] assignment; see also footnote on J|p of (7/2+), |?18-keV level 
$Partial half-life for spontaneous-fission decay calculated by 1985Lo17 and 1978Po09: log[T{-1/2}(SF in years)]|?3.6 and |?5.0 from plots in 1985Lo17 and 1978Po09, respectively, yield spontaneous fission branchings|?1.3|*10{+-5}% and |?5.1|*10{+-7}%. 


level_energy_unit: KEV
level_energy_info: ;ERR=AP;ERR=?
level_spin_parity: (7/2+)
level_comment:
E$|DE=20 keV with level energy derived from Q|a and E|a. This allows the possibility of the (7/2+) state being the ground state, although systematics suggest the ground state is (3/2-). 


level_energy_unit: KEV
level_energy_info: ;ERR=AP;ERR=?
level_lifetime_unit: NS
level_lifetime_info: ;ERR=?
level_comment:
T$from 1972Ga42. 
$Assignment: {+241}Am(|a,2n) systematics (1972Ga42). 
$Spontaneously fissioning shape isomer, only SF decay has been observed. 
E$1972Vy07 deduced level energy from {+241}Am(|a,2n) excitation function and reaction threshold; suggested E=2.2 MeV {I2} as the best level energy. 


level_energy_unit: KEV
level_spin_parity: (4-)
level_lifetime_unit: H
level_comment:
$Branchings were determined by 1956Ch77 from {+244}Cm yield and {+244}Bk |a activity; |a/|e ratio= 6 |*10{+-5}. Uncertainty is deduced by using T{-1/2}(|a decay)=8 y {I3}, quoted by 1956Ch77. 
T$From weighted average of three values from the decay curves of 187|g, 217|g and 891|g in {+244}Bk electron capture decay measured by 2014So17. Other: 4.35 h {I15} (1956Ch77) 
J$Analogy to {+243}Bk and {+245}Bk for 97 th proton, to {+243}Cm and {+241}Pu for 147 th neutron state suggests 4-,(|p 3/2[521]+|n 5/2[622]) configuration. 


level_energy_unit: KEV
level_energy_info: ;OFF=X
level_lifetime_unit: NS
level_lifetime_info: ;ISO=M1
level_comment:
$Only SF decay observed (1972Ga42,1972Wo07). 
T$From measured half-life in 1972Wo07. Other: |>30 ns (1972Ga42). Theoretical calculations: T{-1/2}(SF)=61 ns (1972We09), 7.76 |ms (2005Re16) 
E$Level energy has not been experimentally determined. Calculations of 1972We09 suggest E=1.68 MeV. 


level_energy_unit: KEV
level_spin_parity: (3/2-)
level_lifetime_unit: D
level_comment:
T$From weighted average of 4.95 d {I10} (1951Hu39), 4.98 d {I2} (1956Ma32), and 4.90 d {I3} (1976Ah03). 
J$Nilsson assignment for the g.s. of the 97th proton. 


level_energy_unit: KEV
level_energy_info: ;ERR=CA;ERR=?
level_lifetime_unit: NS
level_comment:
$Only SF decay was observed. T{-1/2}(|g)/T{-1/2}(SF) was calculated by 1972We09 as 5.6|*10{+-8}. 
E$Calculated by 1972We09. 
T$From 1971Re11 ({+243}Am({+4}He,2n), E|a=26 MeV), 1972Ga42 ({+243}Am({+4}He,2n), E|a=24 MeV) 


level_energy_unit: KEV
level_energy_info: ;OFF=X
level_spin_parity: 2(-)
level_lifetime_unit: D
level_lifetime_info: ;ISO=M
level_comment:
E$This level is the only known isomer in this nucleus. Predicted by 1987So10 
J$log{Ift}'s of |?7 to 2-, 3- and 1- states in {+246}Cm require J=2. Configuration=((|p 3/2[521])-(|n 7/2[624])) favors |p=-. 
T$Weighted average of 1.80 d {I2} (1976Ah03) and 1.83 d {I15} (1966Or01) 


level_energy_unit: KEV
level_spin_parity: 3/2-
level_lifetime_unit: Y
level_comment:
$A calculated half-life of |?10000 y for spontaneous fission (1985Lo17) yields %SF|?12. 
T$From 1965Mi08 
J$Favored |a decay from g.s level in {+251}Es 


level_energy_unit: KEV
level_spin_parity: (9/2)+
level_comment:
J$L=2 in {+249}Bk(p,t) reaction [J|p({+249}Bk)=7/2+]; log{Ift}=6.05 for |e feeding from (7/2+) {+247}Cf 


level_energy_unit: KEV
level_spin_parity: 7/2+
level_comment:
$Relative=100 
$The differential cross section at |q=20|' for the 41-keV level was estimated to be about 30 |mb/sr. 


level_energy_unit: KEV
level_energy_info: ;OFF=Z
level_spin_parity: (6+,8-)
level_lifetime_unit: Y
level_lifetime_info: ;ERR=GT
level_comment:
$Assignment: {+246}Cm(|a,pn) chem, ms (1965Mi08). 
J the odd proton may be in the 7/2[633] Nilsson state in analogy to {+249}Bk, and the odd neutron in the 9/2[734] state in analogy to {+247}Cm and {+249}Cf. The Gallagher-Moszkowski rule predicts the parallel coupled 8- state to be lower in energy than the 1- member of the doublet. The long-lived state might be the 8- member of this doublet. However, it is also possible that this may be the (6+) level at E=0.0+y fed in |a decay of {+252}Es rather than the 8- level proposed by 1973Fi06. An assignment of either 6+ or 8- is consistent with the absence of any |b{+-} decay to {+248}Cf. 
T deduced by 1965Mi08 from observation of no change in {+248}Bk/{+247}Bk mass ratio of their sample for a period of ten months within the limits of analysis. T{-1/2}(|b{+-})>1|*10{+4} y was deduced by 1965Mi08 from nonobservation of {+248}Cf |a activities 


level_energy_unit: KEV
level_energy_info: ;OFF=X
level_spin_parity: 1(-)
level_lifetime_unit: H
level_lifetime_info: ;ISO=M1
level_comment:
$The ratio of |e decay/|b{+-} decay was determined by 1978Gr10 from measured I(Curium K| x ray from |e decay)/I(550.7|g from |b{+-} decay)= 4.25 {I28} and I(550.7|g)=7.1 {I5} per 100 |b{+-} decays. 
E$Q(|b{+-})=860 {I20} measured by 1978Gr10, compared with the systematics value of 841 {I71} from 2012Wa38, suggests that E(level)=20 {I+74-20} 
T$from 1978Gr10. Others: 16 h {I3} (1956Ch77), and 23 h {I5} (1956Hu27) 
J$log| {Ift}=7.6 to 2+ and 7.1 to 0+ in |e decay (7.6 to 2+ and 7.8 to 0+ in |b{+-} decay) give J=1. Probable configuration of |p7/2[633]~#|n9/2[734] gives |p=- 


level_energy_unit: KEV
level_energy_info: ;OFF=Y
level_spin_parity: (6+)
level_comment:
E$Q(|a)({+252}Es)=6739 {I3} from E|a=6632 {I3}, and Q(|a)=6789 {I50} from systematics as given in 2012Wa38, suggest that this level lies within 100 keV of the g.s. 
J from the ratio of energy spacings, K=6 was assigned by 1973Fi06 for the rotational band based on this level, and a |p3/2[521]~#|n9/2[734] configuration was proposed. The |a hindrance factor for the |a transition from {+252}Es is consistent with this configuration. 


level_energy_unit: KEV
level_energy_info: ;OFF=Y
level_spin_parity: (7+)
level_comment:
J$E2 |g to 6+. Member of the K|p=6+ band. The |a hindrance factor is consistent with this assignment 


level_energy_unit: KEV
level_energy_info: ;OFF=Y
level_spin_parity: (8-)
level_comment:
J$E1 |g to (7+). No |g to (6+) 
J$1973Fi06 suggest the configuration K|p=8-, |p7/2[633]~#|n9/2[734]; however, this configuration is not consistent with the |a hindrance factor of 2710. The transition would require changes in both the neutron and proton orbitals, and hindrance factors for such transitions are typically much larger 


level_energy_unit: KEV
level_energy_info: ;OFF=Y
level_spin_parity: (8+)
level_comment:
J$|g's to (6+) and (7+). Member of the K|p=6+ band. The |a hindrance factor is consistent with this assignment 


level_energy_unit: KEV
level_energy_info: ;OFF=Y
level_spin_parity: (4-,5-,6-)
level_comment:
J 418.5|g from (5-) state is M1. The authors of 1973Fi06 propose J|p=4-. 
$Although a probable configuration of K=4, |p3/2[521]~#|n5/2[622] is consistent with the M1 transition from the 5-, |p3/2[521]~#|n7/2[613] state, the hindrance factor for the |a from {+252}Es is not. One would expect the HF to be about a factor of hundred less than the experimental value of 2250. 


level_energy_unit: KEV
level_energy_info: ;OFF=Y
level_spin_parity: (4-,5-,6-)
level_comment:
J 377.4|g from (5-) state is M1. The authors of 1973Fi06 propose that it may be the J|p=5- member of a band based on the 171.5+y level 


level_energy_unit: KEV
level_energy_info: ;OFF=Y
level_spin_parity: (5-)
level_comment:
J$HF=5.1 from (5-) suggests probable configuration |p3/2[521]~#|n7/2[613], the same as that of the {+252}Es g.s. 


level_energy_unit: KEV
level_energy_info: ;OFF=Y
level_spin_parity: (7+)
level_comment:
J$A K|p=7+, |p7/2[633]~#|n7/2[613] configuration is suggested by 1973Fi06. The |a hindrance factor is consistent with this assignment 


level_energy_unit: KEV
level_energy_info: ;OFF=Y
level_spin_parity: (6-)
level_comment:
J$The energy spacing and the |a hindrance factor suggest that the level is the 6- member of the K|p=5- band built on the 590.0+Y level 


level_energy_unit: KEV
level_energy_info: ;OFF=Y
level_spin_parity: (8+)
level_comment:
J$The energy spacing and the |a hindrance factor suggest that the level is the 8+ member of a rotational band built on the 624+Y level 


level_energy_unit: KEV
level_energy_info: ;OFF=Y
level_spin_parity: (6+)
level_comment:
E$Q(|a)({+252}Es)=6739 {I3} from E|a=6632 {I3},and Q(|a)=6789 {I50} from systematics as given in 2012Wa38, suggest that this level lies within 100 keV of the g.s. 


level_energy_unit: KEV
level_spin_parity: 7/2+
level_lifetime_unit: D
level_comment:
%A$From |a/|b{+-}=1.37|*10{+-5} {I10} 1969Mi08. Based on the argument of 2013Ah03 who preferred %|a=0.00137 {I10} over 0.00145 {I8}, both of which are from two separate methods in 1969Mi08. The former value does not depend on detector solid angle and the initial analysis of the number of {+249}Bk atoms. Others: |a/|b{+-}=2.2|*10{+-5} {I3} (1957Ea01) 
%SF$from T{-1/2}(SF)=1.87|*10{+9} y {I9} (1969Mi08). Other: |>1.4|*10{+9} y (1957Ea01) 
MOMM1$From electron paramagnetic resonance method (1972Bo67,2019StZV) 
J$J from electron paramagnetic resonance (1967Wo01); |p=+ from configuration=(7/2[633]) and favored |a decay from {+253}Es (J|p=7/2+) 
T$Weighted average of 327.2 d {I3} from growth of daughter activity {+249}Cf and the |g-ray intensities from subsequent decay of {+249}Cf (2014Ch47), 329 d {I2} from chemical purification followed by |b{+-} decay measurement (1999Po33 supersedes 1985Po26: |Dt{-1/2}=4 days quoted as 2|s) and 325 d {I7} from beta decay measurement (1974Gl10). Others: 314 d {I4} (1957Ea01: |Dt{-1/2}=8 days quoted as about 2|s ), |?365 d (1954Di11), 290 d {I20} (1954Ma98), 314 d {I8} (1957Ea01) 
$Configuration=7/2[633] 


level_energy_unit: KEV
level_spin_parity: 3/2-
level_lifetime_unit: MS
level_lifetime_info: ;ERR=?;ISO=M
level_comment:
J$log| {Ift}=5.902 from 1/2+ {+249}Cm suggests spin 1/2, 3/2; T{-1/2} is consistent with M2 transition to g.s., |DL|>3 ruled out (B(E3)(W.u.)|?519 (RUL=100), B(M3)(W.u.)=7390 (RUL=10)). 


level_energy_unit: KEV
level_spin_parity: (1/2+)
level_comment:
J$Fed by |b-decay from 1/2+ favors 1/2 or 3/2. {I368}.77|g to 3/2- 8.773-keV level; cross section ratio in (|a,t)({+3}He,d) reaction (1975Er01) 


level_energy_unit: KEV
level_spin_parity: (5/2+)
level_comment:
J$M1 389.17|g to 7/2+ g.s.; calculated energies considering effects of of the Coriolis interaction and particle pairing among levels in the band (1964Ho10) 


level_energy_unit: KEV
level_spin_parity: (9/2+)
level_comment:
J$(M1) 475.00 |g's to 7/2+ g.s., (M1) 433.20|g to 9/2+ 41.805-keV level, 11/2+ level, (M1) 381.23|g to 11/2+ 93.759-keV level 


level_energy_unit: KEV
level_spin_parity: (7/2+)
level_comment:
J$498.6|g to 7/2+g.s., 456.84|g to 9/2+ 41.805-keV level, 416.3|g to 7/2- 82.597-keV level; band member 


level_energy_unit: KEV
level_spin_parity: (9/2+)
level_comment:
J$477.40|g to 9/2+ 41.80-keV level, 436.8|g to 7/2- 82.597-keV level, 425.43|g to 11/2+ 93.759-keV level; band member 


level_energy_unit: KEV
level_spin_parity: (1/2)
level_comment:
J$From low cross section ratio in the (|a,t),({+3}He,d) measurements (1975Er01) which is consistent with low {Il}-value assignments and possible member of a K=1/2 band 


level_energy_unit: KEV
level_spin_parity: (3/2-)
level_comment:
J$Fed by |b-decay from 1/2- {+253}Es favors 1/2 and 3/2; low cross section ratio in the (|a,t),({+3}He,d) measurements (1975Er01) which is consistent with low {Il}-value assignments and possible member of a K=1/2 band 


level_energy_unit: KEV
level_spin_parity: (1/2-)
level_comment:
J$Fed by |b decay from 1/2- {+253}Es favors 1/2- or 3/2-, (M1+E2) 560.42|g to (3/2-) 8.773-keV level; band member 


level_energy_unit: KEV
level_spin_parity: (5/2+)
level_comment:
J$From decay pattern and likely a member of the 3/2+[651] band (2005Ah03); 624.3|g to 7/2+ g.s, 235.1|g to (5/2+) 389.170-keV level 


level_energy_unit: KEV
level_spin_parity: (5/2-)
level_comment:
J$664.0|g to 3/2- 8.773-keV level, 672.8|g to 7/2+ g.s; assigned configuration 5/2-[523] (2005Ah03) as it is similar the decay of the state at 447.8 keV in {+247}Bk (2015Ne04) 
$Configuration=5/2-[523] 


level_energy_unit: KEV
level_spin_parity: (7/2+)
level_comment:
J$From decay pattern and likely a member of the 3/2+[651] band (2005Ah03); 661.2|g to 9/2+ 41.805-keV level, 314.2|g to (5/2+) 389.170-keV level 


level_energy_unit: KEV
level_spin_parity: (7/2-)
level_comment:
J$From decay pattern (2005Ah03); 282.2|g to 7/2+ 428.955-keV level, 236.1|g to (9/2+) 475.002-keV level 


level_energy_unit: KEV
level_spin_parity: (9/2-)
level_comment:
E$Identified as 7/2-[514] band member in the (|a,t),({+3}He,d) reaction (1975Er01). 
J$From cross section ratio measurements in (|a,t)({+3}He,d) reaction (1975Er01). Expected to be a 7/2-[514] band member (1975Er01,2005Ah03) 


level_energy_unit: KEV
level_spin_parity: (9/2-)
level_comment:
J$767.9|g to 7/2+ g.s., 726.1|g to 9/2+ 41.805-keV level; 9/2 favored as there is no decay to 5/2. |p member of negative vibrational band similar to the vibrational bands at approximately the same energy in {+248}Cm (2005Ah03,1975Ya13) 


level_energy_unit: KEV
level_spin_parity: (9/2+)
level_comment:
J$From decay pattern and likely a member of the 3/2+[651] band (2005Ah03); 227.1|g to (11/2+) 542.095-keV level, 340.2|g to 7/2+ 428.955-keV level 


level_energy_unit: KEV
level_spin_parity: (3/2-)
level_comment:
J$Possible assignment {7/2[633]~#2{+-}}3/2- (2005Ah03); 890.5|g to 3/2{+-} 8.773-keV level, 860.3|g to 5/2{+-} 39.616-keV level 


level_energy_unit: KEV
level_spin_parity: 9/2+
level_comment:
J$Assignment of level as 9/2[624] bandhead based on plausibility of the associated rotational constant (2005Ah03) 
$Configuration=9/2[624] 


level_energy_unit: KEV
level_energy_info: ;ERR=?
level_spin_parity: 7/2-
level_comment:
$S({+3}He,d)=0.18 {I2}, S(|a,t)=0.55 {I3} 
E$Reference state, excitation energy assumed to be 83 keV 


level_energy_unit: KEV
level_spin_parity: 9/2+
level_comment:
$B(E2)=6.81 {I25} (from F. K. McGowan priv. comm. 1988; evaluator is unable to obtain the private communication) 


level_energy_unit: KEV
level_spin_parity: 11/2+
level_comment:
$B(E2)=1.75 {I25} (from F. K. McGowan priv. comm. 1988; evaluator is unable to obtain the private communication) 


level_energy_unit: KEV
level_spin_parity: 9/2+
level_lifetime_unit: PS
level_comment:
T$From indirect measurement of the distance the recoil travelled before emitting conversion electrons (1965Ho15) 


level_energy_unit: KEV
level_comment:
E$ Possible 11/2+ member of 1/2[400] band; 2005Ah03 calculated 639 keV for expected 11/2+ member from rotational constant and decoupling parameter quoted above for the band. 135 |g seen in coin with 425 transition from 9/2+ member. 


level_energy_unit: KEV
level_spin_parity: 2-
level_lifetime_unit: H
level_comment:
T measurement of 1979Re01. Other measured half-lives are 3.10 h (1954Gh24), 3.222 h {I5} (1959Va02), 3.103 h {I19} (1988Po05). 
J log| {Ift}=7.2 for |b to 3+ state rules out J<2; from log| {Ift}'s to 0+ states, J|p Ne 2+ and J is not >2. 
Among the available Nilsson orbitals, analogy to {+251}Bk and {+251}Cf for the proton and neutron states suggests that probable configuration is 2-,(p 3/2[521]+n 1/2[620]). 


level_energy_unit: KEV
level_energy_info: ;ERR=?
level_spin_parity: (4+)
level_lifetime_unit: US
level_comment:
J (M2) to g.s.; |a hindrance factor of |a from 2.757-d {+254}Es is consistent with the J|p and configuration assignments. 


level_energy_unit: KEV
level_energy_info: ;ERR=?
level_spin_parity: (5-)
level_lifetime_unit: NS
level_comment:
J 61.91-keV (E1) transition to (4+). Hindrance factor for the |a from (7+),(p 7/2[633],n 7/2[613]) 275.7-d {+254}Es is consistent with J|p=(5-) and the configuration of (p 3/2[521],n 7/2[613]). 


level_energy_unit: KEV
level_energy_info: ;ERR=?
level_spin_parity: (1-)
level_comment:
J (M1) to g.s. J|p and configuration was assigned by 1973Ah04 in 39.3-h {+254}Es |a decay and by 1982HoZE in (n,|g) reaction. 


level_energy_unit: KEV
level_energy_info: ;ERR=?
level_spin_parity: (3+)
level_comment:
J (M1) transitions from 2+ level at 211.82 and to (4+) level at 35.59. 
E the order of 96.38- and 79.86-keV gammas, feeding and deexciting the level, respectively, were reversed in 39.3-h {+254}Es |a decay and (n,|g) works, with two different level energies. The same configuration assignment was proposed by 1973Ah04 and by 1982HoZE. The order for these two gammas chosen here is mostly based on the intensity balance in |a decay at this level. However, uncertainties on the transition intensities of these gammas do not rule out the reverse order. Therefore, the level energy could very well Be 131.97 keV. 
Another reason for adopting this order is that if the 3+ state were at 131.97 keV, the rotational band parameter would Be much too small, assuming the assignment of the 148.60-keV level as the band's 4+ member is correct. 
An expected E1 transition to g.s. either 115.45 keV or 131.97 keV, which would determine the level's correct energy, would Be obscured by the K|a{-1}| x ray and K|b{-2}'| x ray. 
See also the 39.3-h {+254}Es |a decay set. 


level_energy_unit: KEV
level_energy_info: ;ERR=?
level_spin_parity: (6+)
level_comment:
J 52.16|g and 94.91 |g's to (5+) and (4+) states are (M1+E2) and (E2), respectively; |a hindrance factor in 275.7-d {+254}Es |a decay. 


level_energy_unit: KEV
level_energy_info: ;ERR=?
level_spin_parity: (5-)
level_comment:
J (M1) and (E2) transitions to the (4-) and (3-) members of the band, respectively; energy fit to the band. 


level_energy_unit: KEV
level_energy_info: ;ERR=?
level_spin_parity: (2-)
level_comment:
J assignment was made by 1982HoZE. The (M1) and (M1+E2) transitions to the (3-) and 2- states of the g.s. band, respectively, are consistent with the suggested configuration, which is reasonable among the available Nilsson states expected at low energies. 


level_energy_unit: KEV
level_energy_info: ;ERR=?
level_spin_parity: (4+)
level_comment:
J (M1) transitions to (4+) and (5+) states of the K=4 band, and the energy spacing from the 115.44 level are consistent with this J|p assignment. 


level_energy_unit: KEV
level_energy_info: ;ERR=?
level_spin_parity: (6-)
level_comment:
J (M1+E2) to (5-); rotational parameter. |a hindrance factor is consistent with the J|p and configuration assignments. 


level_energy_unit: KEV
level_energy_info: ;ERR=?
level_spin_parity: (1+)
level_lifetime_unit: NS
level_comment:
J (E1) transitions to (2-) and (1-) states; no |g to (3-). The K=0,(p 7/2[633],n 7/2[613]) configuration, assigned by 1973Ah04 in 39.3-h {+254}Es |a decay and by 1982HoZE in (n,|g), is not consistent with HF=270 for the |a from 2+,2 (p 7/2[633],n 3/2[622]) parent state; it is also not consistent with |g transitions to members of K=1 and K=2 bands with (p 3/2[521]|+n 1/2[620]) configurations. 


level_energy_unit: KEV
level_spin_parity: (7+)
level_comment:
J hindrance factor of 2350 for 6324|a from 275.7-d {+254}Es is consistent with its transition from J|p,K=7+,7,(p 7/2[633],n 7/2[613]) parent to (7+) of K=4,(p 7/2[633],n 1/2[620]) band. 


level_energy_unit: KEV
level_energy_info: ;ERR=?
level_spin_parity: (4-)
level_comment:
J (M1) transitions to (3-) and (4-) states of g.s. band. J|p=(4-) is preferred from nonobservation of |g to 2- g.s. Energy fit to level is somewhat poor. 


level_energy_unit: KEV
level_energy_info: ;ERR=?
level_spin_parity: 2+
level_comment:
J parity is from E1 character of 211.82|g to 2- g.s. Spin is from favored |a decay from 39.3-h {+254}Es. 


level_energy_unit: KEV
level_energy_info: ;ERR=?
level_spin_parity: (0+)
level_comment:
J (M1) and (E1) transitions to (1+) and (1-), respectively; no |g t0 J=2 and higher J|p states. A=6.80, if this and 175.12-keV levels are 0+ and 1+ members of a K=0 band, as proposed by 1982HoZE. 


level_energy_unit: KEV
level_energy_info: ;ERR=?
level_spin_parity: (3+)
level_comment:
J HF(6357|a)=30 {I3}, in 39.3-h {+254}Es |a decay, is consistent with |a transition from 2+,2(p 7/2[633],n 3/2[622]) parent to this state with main configuration of 3+,2(p 7/2[633],n 3/2[622]) . 
E 121.29|g deexciting this level is assumed to Be incorrectly shown in decay scheme of 1982HoZE to decay to the 148.60-keV level: it is placed here between this level and the 115.44-keV level. E(level)=236 {I3} from E|a's. 


level_energy_unit: KEV
level_spin_parity: (9+)
level_comment:
J (M1,E2) to (8+) member of the K=7 band; HF(|a)=380 is consistent with |a transition from the 7+,7(p 7/2[633],n 7/2[613]) parent. 


level_energy_unit: KEV
level_spin_parity: (7-)
level_comment:
J (M1,E2) to (6-) amd |g to (5-) members of the band; HF=224 {I22} for |a transition from the 7+,7(p 7/2[633],n 7/2[613]) parent. 


level_energy_unit: KEV
level_energy_info: ;ERR=?
level_spin_parity: (5+)
level_comment:
J J|p=5+ of K=5,(p 7/2[633]+n 3/2[622]) band assignment was made by 1982HoZE from M1 |g transitions to 4+ and 5+ members of K=4,(p 7/2[633],n 1/2[620]) band. The level observed at 316 keV in 39.3-h {+254}Es |a decay was assigned by 1973Ah04 to J|p=5+ of K=2,(p 7/2[633]-n 3/2[622]) band. Both of these 5+ states may Be populated by |a in 39.3-h {+254}Es. 


level_energy_unit: KEV
level_energy_info: ;ERR=?
level_spin_parity: (6+)
level_comment:
J (M1) transitions to (5+) and (6+) members of K=4 band; (6+) is inferred from non-observation of an E2 to the band's (4+) member. 


level_energy_unit: KEV
level_energy_info: ;ERR=?
level_spin_parity: (6+)
level_comment:
J K,J|p=6,6+, (p 5/2[642],n 7/2[613]) state was proposed by 1982HoZE from (n,|g), and also by 1982KoZZ in {+254}Es |a decay data which is not included in this evaluation, since it is tentative. It should Be pointed out that an |a transition to this state from the 7,7+ (p 7/2[633],n 7/2[613]) parent is expected to have low hindrance factor. 


level_energy_unit: KEV
level_comment:
E calculated from Q(|a)({+254}Es)=6615.7 {I15} and E|a=6105 {I2}. This level may Be identical to the state identified in (n,|g) at 406-keV. However, in their preliminary |a decay work, 1982KoZZ observed a new |a to 406-keV level, presumably in addition to an |a to the 413-keV level. If the 6105|a is a doublet, HF(|a to 406)|>22 which is consistent with an |a transition between the 7+,7(p 7/2[633],n 7/2[613]) parent and a 6+,6(p 5/2[642],n 7/2[613]) daughter state. |a and |g spectra with higher resolution are needed to resolve whether or not these two levels are the same. 


level_energy_unit: KEV
level_comment:
This level is probably not the same state observed in (n,g): the n 1/2[761] is a particle state, as identified in 249Cf from (d,p) data. Probability of this quisi-particle state in 254Es gs configuration is probably negligible. 


level_energy_unit: KEV
level_energy_info: ;ERR=?
level_comment:
J J|p,K=6+,6 (p 7/2[633],n 5/2+[622]) was proposed from (n,|g) data. The same configuration was assigned by 1982KoZZ to a level at 355.3 keV from {+254}Es |a decay. 


level_energy_unit: KEV
level_spin_parity: (7+)
level_lifetime_unit: US
level_comment:
E THE EA(TO THIS LEVEL)-EA(TO THE 97.49-KEV LEVEL) YIELD E(LEVEL)=84.1 22; EG=385 2 FROM 472-KEV LEVEL GIVES E(LEVEL)=87 3. 


level_energy_unit: KEV
level_spin_parity: (8+)
level_comment:
E EG=70.4 1 TO THE 86-KEV LEVEL GIVES E(LEVEL)=156 2; FROM Q=6615.7 15 AND EA=6358.4 15, E(LEVEL)=155.6 22. 


level_energy_unit: KEV
level_energy_info: ;ERR=?
level_spin_parity: (1+)
level_lifetime_unit: NS
level_comment:
K=0,(p 7/2[633],n 7/2[613]) configuration was assigned by 1973Ah04. See adopted levels for a comment. 


level_energy_unit: KEV
level_spin_parity: (5+)
level_comment:
J J|p=5+ of K=2,(p 7/2[633],n 3/2[622]) band was assigned by 1973Ah04. From (n,|g) data, J|p=5+ of K=5,(p 7/2[633],n 3/2[622]) was assigned to a 316.46-keV level. 


level_energy_unit: KEV
level_energy_info: ;ERR=?
level_spin_parity: 4+
level_comment:
E$ energy from 'adopted levels' dataset for {+250}Bk in ENSDF database used for normalization 
$d|s/d|W=170 |mb/sr {I7} (90|'), 130 |mb/sr {I8} (125|'); calculated used for normalization of other relative cross sections 


level_energy_unit: KEV
level_spin_parity: (3/2-)
level_lifetime_unit: MIN
level_comment:
T$Weighted average of 55.6 min {I11} (1984Li05) and 57.0 min {I17} (1967Di02). Other: 55.6 min (1978Lo13, citing unpublished data). 
%B-$No |a decay, SF expected; calculated T{-1/2}(|a)|?2|*10{+9} min (2019Mo01), calculated T{-1/2}(SF)|?5|*10{+7} min (1985Lo17) 


level_energy_unit: KEV
level_uncertain: ?
level_comment:
E$indirectly deduced from the detection of {+252}Cf (T{-1/2}=2.647 y) in the debris of a thermonuclear test. 
%B-$expected to be the dominant decay mode of {+252}Bk, considering the theoretical half-life for |a decay is 10{+12.2} s (2019Mo01) 
$Theoretical |b decay T{-1/2} > 100 s (2019Mo01) 


level_energy_unit: KEV
level_lifetime_unit: S
level_comment:
T from 1995La09: deduced using the maximum-likelihood method, the uncertainty is statistical only. In Table 1 (1995La09), T{-1/2}=2.4 s +0.8 -0.4 from {+207}Pb({+34}S,4n) and T{-1/2}=1.9 s {I3} from {+206}Pb({+34}S,3n) are presented. 
%SF estimated using a cross section value of 0.5 nb (but 0.05 nb in 1995La09, Table 1) for the {+206}Pb({+34}S,3n), {+207}Pb({+34}S,4n) reactions on the assumption that SF Branching is dependent on the absolute cross sections (1995La09). 


level_energy_unit: KEV
level_spin_parity: (3/2+)
level_lifetime_unit: S
level_comment:
T$ measured by 2010Kh06 from time distribution of Er-SF and Er-|a correlated events 
$ SF decay total kinetic energy=183 MeV {I10} (2010Kh06) 
$ Production |s<0.6 nb for E({+36}S)=163.6 MeV, 2.5 nb {I+8-5} for E({+36}S)=170.0 MeV, 3.2 {I11} for E({+36}S)=172.6 MeV, 1.4 nb {I4} for E({+36}S)=173.0 MeV, <1.7 nb for E({+36}S)=174.3 MeV 


level_energy_unit: KEV
level_lifetime_unit: S
level_uncertain: S
level_comment:
T from 1981Mu12 
Calculated values of T{-1/2}(|e): |?100 s (1973Ta30); |?5.6 s (1997Mo25). From |a syst, %|a>50. 
Calculated T{-1/2}(SF)=5.7|*10{+3} y (1994EfZW). 
J expected low-lying configurations are 5/2[633] and 3/2[631] 


level_energy_unit: KEV
level_lifetime_unit: S
level_comment:
T$from recoil-|a-|a(t) (2020Kh10) 
%A$from number of |a decays of {+243}Fm and {+239}Cf (2020Kh10). 


level_energy_unit: KEV
level_spin_parity: 0+
level_lifetime_unit: MIN
level_comment:
$Except for half-life and decay modes, no other properties of the decay of {+240}Cf are known. 
T$ weighted average from 0.9 min {I2} (1995La09); 0.8 min {I+3-2} (1995La09); 1.06 min {I15} (1970Si19) 
$ T{-1/2}(SF) |? 53 min (recommended value by 2000Ho27) from 1995La09. The SF decay mode has been observed by 1995La09. 
$ Only the |a decay and SF decay modes have been observed. However, calculations of 1997Mo25 predict T{-1/2}=54 s for |b decay and T{-1/2}=74 s for |a decay, suggesting that a significant fraction of the decay proceeds by |b decay. However gross theory calculations of 1973Ta30 predict 400-10{+6} s which suggests <14% |e+|b{++} decay 


level_energy_unit: KEV
level_spin_parity: 0+
level_lifetime_unit: S
level_comment:
%A$ uncertainty assigned by the compiler based on %SF=1.5 {I2}. 2010Kh06 quote 98.5 {I23} in table 2 
$%|e+%|b{++} decay mode is found to be negligible (2010Kh06) 
$ Total Kinetic energy (TKE) in SF decay=186 MeV {I10} (2010Kh06) 
T$ 2010Kh06 quote from 1970Si09: Phys. Rev. C2, 1948 
$ Production |s=75 nb {I16} for E({+36}S)=165.5 MeV and 196 nb {I10} for E({+36}S)=170.3 MeV and {+207}Pb target 
$ Production |s=76 nb {I10} for E({+36}S)=163.6 MeV and 12 nb {I+5-4} for E({+36}S)=172.6 MeV and {+206}Pb target 


level_energy_unit: KEV
level_spin_parity: (7/2-)
level_lifetime_unit: MIN
level_comment:
$The electron-capture branch has not been observed. The 7342|a from {+241}Cf is assumed by the evaluator to be a favored transition with HF=2.0. This gives %|a|?25 and thus %|e+%|b+|?75 
T$From 1970Si19. Others: 2.35 m {I18} (2010AsZX) 
J$An analogy to {+235}U and {+237}Pu, both with 143 neutrons, suggest the configuration 7/2[743] 


level_energy_unit: KEV
level_energy_info: ;ERR=AP;ERR=?
level_spin_parity: (1/2+)
level_comment:
J$the HF for |a decay from {+245}Fm determines the configuration to be the same as that of the {+245}Fm g.s. If configuration=1/2[631] for {+245}Fm, in analogy to {+241}Cm, {+239}Pu, and {+237}U with 145 neutrons, then that configuration applies also to this level 


level_energy_unit: KEV
level_energy_info: ;ERR=AP;ERR=?
level_comment:
E$From Q(|a)({+245}Fm)=8440 {I100,syst} and E|a=8150 {I20}, with the uncertainty in Q(|a) being a systematics value, one gets E=155 {I102} 


level_energy_unit: KEV
level_lifetime_unit: MIN
level_comment:
T$from Er-|a-|a-|a(t) (2022Te01). 
$E|a=7360 {I27} was observed following the decay of {+241}Cm (2022Te01) 


level_energy_unit: KEV
level_spin_parity: 0+
level_lifetime_unit: MIN
level_comment:
%A$From |a decay of {+246}Fm (2011Ve03). Others: 80 % {I20} deduced by 1981Mu12 from relative alpha intensities of mother and daughter decay following {+246}Fm decay. 
%EC+%B+$Deduced from |b{+}/|e obtained from intensity ratio of |a lines of {+242}Cf and {+246}Fm by 2011Ve03. 
%SF$The upper limit for SF decay was obtained by 1995La09. 
T$The measured half-lives are T{-1/2}({+242}Cf)=3.7 min {I3} (1967Il01), 3.2 min {I5} (1967Fi04), 3.4 min {I2} (1967Si07), and 3.68 min {I44} (1970Si19). A weighted average of these values gives 3.49 {I15}. The evaluators assign as uncertainty the smallest of the input values, giving 3.49 {I20} and then rounds off the value. 


level_energy_unit: KEV
level_energy_info: ;OFF=X
level_comment:
$Excited state decays by |e-delayed SF mode 
E$Assumed based on observations of three |a events during the beam pauses. 
$|e decay-delayed fission was observed by 1994La25 and by 2000Sh10. Based on the ratio of the number of fission events and the number of |a decays from {+242}Cf g.s., 2000Sh10 determined the probability of delayed fission to be 0.006 {I2}. 


level_energy_unit: KEV
level_spin_parity: (1/2+)
level_lifetime_unit: MIN
level_comment:
T$weighted average of 12.5 min {I10} (1967Fi04) and 10.3 min {I5} (1967Si08). 
J$unhindered |a decay from {+247}Fm 5.1-sec isomeric level and systematics of N=145 isotones suggests J|p=1/2+ with configuration 1/2+[631]. 
%EC+%B+,%A$1967Si08 estimate (|a+|e)/7060|a=10 {I2} from measured cross section for 7060|a of {+243}Cf and calculated maximum cross sections for {+235}U({+12}C,4n), {+236}U({+12}C,6n) reactions. From relative intensities of {+243}Cf |a's, 7060|a/7170|a|?2.5, branchings were calculated to be |a/(|a+|e)|?0.14, |e/(|a+|e)|?0.86. 


level_energy_unit: KEV
level_energy_info: ;ERR=AP;ERR=?
level_spin_parity: (3/2+)
level_comment:
E$from systematics of 3/2+ to 1/2+ spacings in the 1/2+[631] band, E=7 keV {I2} is extrapolated by 2006He27. 


level_energy_unit: KEV
level_energy_info: ;ERR=AP;ERR=?
level_spin_parity: (5/2+)
level_comment:
J$from systematics of the energy difference between the 7/2+ member and the 5/2+ bandhead of the 5/2+[622] Nisson level. 


level_energy_unit: KEV
level_energy_info: ;ERR=AP;ERR=?
level_spin_parity: (7/2+)
level_comment:
J$unhindered |a decay from {+247}Fm ground state with J|p=(7/2+) and configuration 7/2+[624]; the same J|p and configuration are suggested 


level_energy_unit: KEV
level_spin_parity: (1/2+)
level_lifetime_unit: MIN
level_comment:
J$from {+243}Cf Adopted Levels in the ENSDF database (Sept 2013 update) 
T$measured by 2018Ko05, from (evaporation residues)|a-correlated decay curve, with gate on |a in the range of 6.98-7.09 MeV. This value can be compared with 10.7 min {I5} in {+243}Cf Adopted Levels in the ENSDF database, taken as weighted average of 12.5 min {I10} from 1967Fi04: Phys. Lett. 24B, 340; and 10.3 min {I5} from 1967Si08: Phys. Lett. |b{-24}, 333. 


level_energy_unit: KEV
level_spin_parity: 0+
level_lifetime_unit: MIN
level_comment:
T$From 1967Si08. Other measured half-lives: 25 min {i3} (1956Ch43), 20.4 min {i16} (1967Fi04), 20 min {i11} (1973Es02). 
$Only |a decay has been observed. 


level_energy_unit: KEV
level_spin_parity: 2+
level_comment:
E$Calculated from measured E|a in {+248}Fm |a decay and Q|a({+248}Fm)=7995 {I8} (2017Wa10) 
J$From band member 


level_energy_unit: KEV
level_energy_info: ;OFF=X
level_comment:
$Only the SF decay has been identified. 
$Half-life of this fission isomer has not been measured. 
E$The isomeric state was produced by {+244}Es |e decay. Level energy has not been determined experimentally. Calculations by 1974YaZI yield E(level)=0.9 MeV. 


level_energy_unit: KEV
level_spin_parity: 0+
level_lifetime_unit: MIN
level_comment:
$%|a determined by 2018Ko05 from comparison of the number of |a decays from {+248}Fm and {+244}Cf from a gas-vetoed |a-particle energy spectrum as shown in their Fig. 4. This value can be compared with %|a|<100 in {+244}Cf Adopted Levels in the ENSDF database (August 2017 update) 
T$measured by 2018Ko05, from (evaporation residues)|a-correlated decay curve with gate on |a in the range of 7.12-7.27 MeV. This value can be compared with 19.4 min {I6} in {+244}Cf Adopted Levels in the ENSDF database, taken from 1967Si08: Phys. Lett. |b{-24}, 333. Others: 20 min {i11} (1973Es02: Phys. Fenn. 8, 357, two authors in 1973Es02 same as in 1967Si08); 20.4 min {i16} (1967Fi04: Phys. Lett. 24B, 340); 25 min {I3} (1956Ch43: Phys. Rev. 102, 747). 


level_energy_unit: KEV
level_spin_parity: 1/2+
level_lifetime_unit: MIN
level_comment:
T$Unweighted average of 43.6 min {I8} (1967Fi04) and 46.4 min {I3} (1996Ma72). Other: 44 min (1956Ch43). 
%A,%EC$From the intensity of the 252-keV |g ray from {+245}Bk |e decay (I(252|g)=31.2%) relative to the alpha-particle intensity from {+245}Cf |a decay (1996Ma72). The evaluator has adjusted the branching ratio using the current absolute intensity for (I(252|g)=30.4 % {I27}) in {+245}Bk |e decay Others: %|a=36 {I4} (1992ShZZ), %|a= 36.0 {I26} (1996Ma72), |a|?30 (1956Ch43) 
J$Favored alpha decay to {+241}Cm (J|p=1/2+) from {+245}Cf g.s. 


level_energy_unit: KEV
level_spin_parity: (7/2+)
level_comment:
$Configuration=|n7/2[624] (2012He09) 
J$The 7540-keV |a from {+249}Fm g.s. with J|p=(7/2)+ is expected to be a favored transition. 


level_energy_unit: KEV
level_spin_parity: (7/2+)
level_comment:
$Configuration=|n7/2[624] (2012He09) 
E$From 2011Lo06. Others: |? 55 keV (2012He09), 55 keV {I10} (2004He28), 


level_energy_unit: KEV
level_spin_parity: 0+
level_lifetime_unit: H
level_comment:
T$From 1951Hu39. Other: 1951Gh23 
%SF$From T{-1/2}(SF)=1810 y {I240}: unweighted average of 2000 y {I200} (1968Sk01), 1340 y {I160} (1963Fr04), 2100 y {I300} (1953Hu85). Other: T{-1/2}(SF)=1800 y {I600}, recommended in 2000Ho27. 


level_energy_unit: KEV
level_energy_info: ;ERR=AP;ERR=?
level_lifetime_unit: NS
level_lifetime_info: ;ISO=M
level_comment:
T$From fission fragment distribution along the flight path and fitting (1968Ga04). 
$SF isomer produced by {+238}U({+12}C,4n) (1968Ga04). Energy from difference between ground and isomer threshold energies as estimated by 1968Ga04 
$See |e delayed fission from {+246}Es (2001Sh09,1980Ga07) 


level_energy_unit: KEV
level_spin_parity: (7/2+)
level_lifetime_unit: H
level_comment:
$Branchings were determined by 1984Ah02 from measured alpha and Cm K x-ray intensity ratio of 4.7|*10{+-4} {I5}; the K x-ray intensity was taken as 72.3 per 100 |e decays. 
T$From 1984Ah02 and 1979Ah03. Other measurements: 2.45 h {I15} (1956Ch77), 2.5 h (1954Hu50). 
J$Analogy to {+245}Cm suggests 7/2[624] neutron orbital. 


level_energy_unit: KEV
level_spin_parity: (9/2-)
level_comment:
J$E1 358.3|g to (11/2+) and E1 480.4|g to (7/2+). Favoured |a transition from {+251}Fm with HF=1.63 {I13} 


level_energy_unit: KEV
level_spin_parity: (7/2-)
level_comment:
J$|g's to the (7/2+) and (9/2+); analogy to a similar band at 644 keV in {+245}Cm, 1973Ah02 suggested the 7/2-, 7/2[743] assignment. 


level_energy_unit: KEV
level_spin_parity: 0+
level_lifetime_unit: D
level_comment:
T,%SF$1973Hu01 report T{-1/2}=333.5 d {I28} and a/SF=3.5|*10{+4} {I3}. These data give T{-1/2}(SF)=3.2|*10{+4} y {I3} (recommended by 2000Ho27). Other T{-1/2}(SF): 4.1|*10{+4} y {I4} (1968Sk01) 
T$from 1973Hu01 


level_energy_unit: KEV
level_comment:
J$assigned by the authors as the possible 10+ member of the g.s. band; however, the 10+ member is assigned at E=737.3 in ({+18}O,xn|g) 


level_energy_unit: KEV
level_spin_parity: 2-
level_lifetime_unit: NS
level_comment:
$K|p=2- isomer (2022Or04) 
T$from measured mean lifetime |t=6.7 ns {I2} (2022Or04) by ({+19}O)|g|g(t) 


level_energy_unit: KEV
level_lifetime_unit: NS
level_lifetime_info: ;ERR=GT;ISO=M
level_uncertain: ?
level_comment:
$K|>5 isomer (2022Or04) 
$Possible K|p=5-, |p3/2[521]~#|p7/2[633] state or K|p=8-, |n9/2[734]~#|n1/2[620] state (2022Or04), based on theoretical calculations 
$This level could possibly be associated with a known 8- level at 1261 keV from (d,t) work by 2008Ka27 


level_energy_unit: KEV
level_lifetime_unit: NS
level_uncertain: ?
level_comment:
E$from Fig. 8 in 2022Or04. Authors list (930) in Table I. 
J$If K|p=5- for the 0.90-MeV state, then E1 for the 47.8|g suggests 4+,5+,6+ for the 0.95-MeV state. 
T$from measured mean lifetime |t=16.8 ns {I5} (2022Or04) by ({+19}O)|g|g(t) 


level_energy_unit: KEV
level_uncertain: ?
level_comment:
$Level taken from (d,t) work of 2008Ka27 (Phys. Rev. C 78, 014301); tentatively assigned in the present work based on strong 429.6|g in delayed coin with the 550.6|g 


level_energy_unit: KEV
level_spin_parity: 9/2-
level_lifetime_unit: Y
level_comment:
MOMM1,MOME2$Deduced from the weighted mean values for the ground state HFS parameters (2023We04) 
J$From favored |a to 9/2-, 9/2[734] level in {+245}Cm. 
T$From weighted average of 350.6 y {I21} (1973St15), 352 y {I6} (1969Me01), 345 y {I15} (1969Mi08) and 360 y {I40} (1957Ea01) 
%SF$fom T{-1/2}(SF)=7.2|*10{+10} {I7}; unweighted average of 8.5|*10{+10} y {I5} (1987Ta26), 6.87|*10{+10} y {I33} (1969Mi08), 6.14|*10{+10} y {I37} (1966Rg04) 


level_energy_unit: KEV
level_spin_parity: 5/2+
level_lifetime_unit: US
level_lifetime_info: ;ISO=M
level_comment:
J$M2+E3 234.6|g to 9/2{+-}g.s., E2 271.8|g from 1/2+ 416.8-keV level. 
T$From |a|g(t) in {+253}Fm |a decay (1967Ah02) 


level_energy_unit: KEV
level_spin_parity: 9/2+
level_comment:
J$E1 375.1|g to 11/2{+-} 62.48-keV level; E1 437.6|g to 9/2- g.s.; M1+E2 58.01|g to 7/2+ 379.54-keV level 


level_energy_unit: KEV
level_spin_parity: (9/2-)
level_comment:
J$902.6|g to 9/2- g.s., 766.3|g to 13/2{+-} 136.2-keV level; log{Ift}=7.8 from 7/2+ {+249}Es |e decay; band member 


level_energy_unit: KEV
level_spin_parity: (7/2-,9/2)
level_comment:
J$1137.3|g to 11/2{+-} 62.48-keV level; 1199.8|g to 9/2- g.s.; log{Ift}=7.8 from 7/2+ {+249}Es |e decay. 


level_energy_unit: KEV
level_spin_parity: (7/2)-
level_comment:
J$M1+E2 1218.5|g to 9/2- g.s.; log{Ift}=5.9 from 7/2+ {+249}Es |e decay. The low log{Ift} indicates that this is not the 7/2[743] hole state. 1976Ah07 has suggested that this is a 3-quasiparticle state with configuration=((|p 7/2[633])(|p 3/2[521])(|n 3/2[622])) 


level_energy_unit: KEV
level_spin_parity: 27/2+
level_comment:
J$159|g to 25/2+ 1107.4-keV; 305.8|g to 23/2+ 960.2-keV level; log{Ift}=7.2 from 7/2+ {+249}Es |e decay; band member 


level_energy_unit: KEV
level_spin_parity: (9/2-)
level_comment:
J$1205.1|g to 11/2{+-} 62.48-keV level; 1267.8|g to 9/2- g.s.; log{Ift}= 7.2 from 7/2+ {+249}Es |e decay 


level_energy_unit: KEV
level_spin_parity: (7/2)-
level_comment:
E$K|p=7/2-. Three-quasiparticle state. 
$Configuration=((|p 7/2[633])(|p 3/2[521])(|n 3/2[622])) (1976Ah07) 


level_energy_unit: KEV
level_spin_parity: 0+
level_lifetime_unit: Y
level_comment:
T measurement of 1969Me01. Other measurement: 10.9 y {I8} (1957Ea01). 
Branchings are from unweighted average of the measured |a/SF=1330 {I45} (1963Ph01), 1260 {I40} (1965Me02). 
Cross sections for |a, t, and p emission following fission were measured by 1985Wi10. 
Cross sections of fission fragments in {+238}U({+12}C,F) were measured and effective moment of inertia at saddle point was deduced by 1990Li26. The angular distribution of fission fragments in {+238}U({+12}C,F) were measured by 1986Ka12 and 1985Ja14. 
Neutron multiplicity was measured by 1980Ho01 from fragment-neutron coincidences. Average number of neutron emitted in SF decay was measured by 1971Or03. 
Fission-fragment kinetic energy distribution was measured by 1973Ho02. 


level_energy_unit: KEV
level_spin_parity: 2+
level_lifetime_unit: PS
level_comment:
J E2 transition to 0+ g.s. 
T calculated from B(E2)=0.11 {I1}, deduced in (d,d'), and adopted |g branchings from the level. 


level_energy_unit: KEV
level_spin_parity: (2)-
level_comment:
J E1 to 2+; no 1210|g to g.s.; |e decay from 1(-) {+250}Es suggests J|p Ne 3-. 
Almost pure 2-,(n 9/2[734]-n 5/2[622]) configuration was suggested in 1980Ah01. The |e decay transition from the 1-,(n 7/2[633]-n 9/2[734]) {+250}Es parent could Be via the p 7/2[633] to p 5/2[622] transition. The n 5/2[622] state is a hole state, close to the 9/2[734] state; some admixture of 1-,(n 9/2[734]-n 5/2[622]) configuration in 2.22-h {+250}Es can explain this |e transition. 
The decay from the 2-,(p 3/2[521]+n 1/2[620]) {+250}Bk g.s., however, is not consistent with a |b transition to an almost pure 2-,(n 9/2[734]-n 5/2[622]) state; this |b branch requires configuration admixtures in {+250}Bk g.s. or in this 1209.97-keV level, or both. The log| {Ift} of 9.30 for this 2- to 2- |b transition and population of the same level in 1(-) {+250}Es |e decay with a log| {Ift} oF 7.36 would only Be consistent with some admixture. Therefore, its structure should Be quite mixed, not almost pure two-neutron state as proposed. 
If the 1209.97 level is indeed a mixed state, the level at 1210 keV, seen in (|a,t) reaction (which populates two proton states), could also Be the same level. Because of insufficient data, the level populated in (|a,t) is listed here with the level seen in (d,d') at 1211 keV. 


level_energy_unit: KEV
level_spin_parity: (3-)
level_comment:
J from (d,d'); large B(E3) suggests octupole vibration 
The level observed in (|a,t) is assumed to populate a two-proton component of this collective state. 
Population of this level in {+250}Bk |b{+-} decay is not established. 


level_energy_unit: KEV
level_spin_parity: (3-)
level_comment:
J from (d,d') data, 1980Ah01 suggested that this level is the 3- member of a K=2 band, based at 1209.97 keV level. 


level_energy_unit: KEV
level_spin_parity: 2+
level_comment:
J E2 to g.s. From the absence of any 0+ and 1+ levels in the vicinity of this level, 1980Ah03 suggested K=2 for this state. 


level_energy_unit: KEV
level_spin_parity: (3+)
level_comment:
J |g's to 2+, 4+; |b feeding from 2- {+250}Bk. The tentative assignment of this level to K=2 rotational band is based on its energy difference with the 1658-keV level. 


level_energy_unit: KEV
level_energy_info: ;ERR=?
level_comment:
This level is probably the 2-,(n 9/2[734],n 5/2[622]) state assigned by 1980Ah03 in 2.22-h {+250}Es |e decay. 


level_energy_unit: KEV
level_spin_parity: 9-
level_comment:
$ Configuration=|n9/2[734]~$ |n7/2[613], K|p=8- 
$d|s/d|W(90|')=34 |mb/sr {I4}, d|s/d|W(135|')=51 |mb/sr {I5} 


level_energy_unit: KEV
level_spin_parity: (5+)
level_comment:
$Configuration=|n9/2[734]~$ |n1/2[750], K|p=(5+) 
$d|s/d|W(90|')=246 |mb/sr {I10}, d|s/d|W(135|')=0.26 mb/sr {I7} 


level_energy_unit: KEV
level_spin_parity: (4+)
level_comment:
$Configuration=|n9/2[734]~$ |n1/2[750], K|p=(4+) 
$d|s/d|W(90|')=135 |mb/sr {I7}, d|s/d|W(135|')=136 |mb/sr {I46} 


level_energy_unit: KEV
level_spin_parity: 1/2+
level_lifetime_unit: Y
level_comment:
J$favored |a decay to 1/2+ in {+247}Cm. 
T$weighted average of 892 y {I88} (1968Ch03), 900 y {I50} (1969Me01) 
%SF$SF has not been observed, however, calculated T{-1/2}(SF)|?1000 y (1985Lo17) 


level_energy_unit: KEV
level_spin_parity: 7/2+
level_comment:
J$E2 |g to 3/2+ level, (M1+E2) |g to 5/2+ level; band structure (E=105.75 {I3} from band parameters) 


level_energy_unit: KEV
level_spin_parity: 7/2+
level_lifetime_unit: NS
level_comment:
T$from |a|g(t) (1971Ah01); other 37 ns {I2} |a|g(t) (1964As01) 
J$E2 |g to 3/2+ level, (M1+E2) |g to 5/2+ level; band structure and configuration=7/2+[613] (2005Ah09) 


level_energy_unit: KEV
level_spin_parity: 9/2+
level_comment:
J$M1(+E2) |g to 7/2+ level; favored |a decay from {+255}Fm suggests band structure with 7/2+ 106.309 level. 


level_energy_unit: KEV
level_spin_parity: 5/2+
level_comment:
J$|g's to 3/2+ and 5/2+ levels; log| {Ift}=7.2 from {+251}Bk |b{+-} decay, log| {Ift}=6.9 from {+251}Es |e decay; band structure 


level_energy_unit: KEV
level_spin_parity: 11/2+
level_comment:
J$M1(+E2) |g to 9/2+ level, (E2) |g to 7/2+ level; band structure; HF in {+255}Fm |a decay suggests membership in the 7/2[613] band 


level_energy_unit: KEV
level_spin_parity: (15/2+)
level_comment:
J$(M1) |g to (13/2+) level, |g to 11/2+ level; rotational structure (E=423.7 {I16} from rotational parameters) 


level_energy_unit: KEV
level_spin_parity: 1/2+
level_lifetime_unit: Y
level_comment:
MOMM1$deduced from the weighted mean values for the ground state HFS parameters using new theoretical calculations. 


level_energy_unit: KEV
level_spin_parity: 0+
level_lifetime_unit: Y
level_comment:
T$2.647 y {I3} adopted from 1994KhZW on the analysis of the following measured half-lives: 2.646 y {I4} (1965Me02), 2.621 y {I6} (1969De23), 2.659 y {I10} (1973Mi05), 2.638 y {I7} (1974Sp02), 2.637 y {I5} (1976Mo30), 2.640 y {I7} (1982La25), 2.651 y {I4} (1984SmZV), 2.648 y {I2} (W.G. Alberts and M. Matzke, PTB Mitteilungen 93, 315 (1983)), and 2.6503 y {I31} (1985Ax02). This analysis took into account the duration and the number of measurements in each experiment by comparing them with a formulated ideal experiment. Other measured half-lives: 2.55 y {I15} (1957Ea01); 2.628 y {I10} (1974Sh15); 2.653 y {I1} (quoted in 1992Ra08 as private communication J.R. Smith). Other evaluated half-lives: 2.645 y {I8} (1986LoZT: an average of 2.638 y and 2.651 y with a quoted error sufficiently large to cover the range of uncertainty); 2.648 y {I2} (1992Ra08: Rajeval method); 2.650 y {I2} (1994Ka08: Modified Bayesian Method). 
$%|a and %SF from weighted average of deduced %SF values from |a/SF=31.56 {I35} (1993Pa29), 31.5 {I3} (1970Al23), 31.3 {I5} (1970Al23), 31.3 {I2} (1965Me02), 31 {I1} (1954Ma98) and measured %SF value of 3.1028 {I27} (2018Be29). Other |a/SF measurements: T{-1/2}(SF)=66 y {I10} (1957Ea01), |a/SF=36.4 (1961Se18). 


level_energy_unit: KEV
level_spin_parity: 2+
level_lifetime_unit: PS
level_comment:
T$calculated from B(E2)|^=16.7 e{+2}b{+2} {I11} in Coulomb excitation with |a(45.72|g)=917. 
J$E2 |g to 0+; populated from 0+ by Coulomb excitation. 


level_energy_unit: KEV
level_spin_parity: (2+)
level_comment:
J$|gs to 0+ and 2+, no |g to 4+; analogous to the K=2, 2+ band head of K{+|p}=2+ band observed in {+250}Cf and {+254}Fm. 


level_energy_unit: KEV
level_spin_parity: (2-)
level_comment:
J$no |gs to 0+ or 4+; 785.1|g to 2+, analogous to the K=2,2- band head of K{+|p}=2- band observed in {+250}Cf, and consistent with its properties. 


level_energy_unit: KEV
level_spin_parity: (3+)
level_comment:
J$E1 |g to (2-); M1 |g to (2+); |gs to 2+ and 4+; and no |g to 0+. 
$the two-quasiparticle configuration of |n 1/2[620] + |n 7/2[613] was proposed by 1973Fi06. This assignment is consistent with its population in {+252}Es |e decay. 


level_energy_unit: KEV
level_spin_parity: 2+
level_lifetime_unit: PS
level_comment:
$The intrinsic quadrupole moment, Q(0)=12.9 {I4}, was calculated by 1971Fo17 from B(E2)|^ of 16.7 {I11} with rigid rotor assumption. 
$T{-1/2}=92 ps {I6} is calculated from B(E2)|^=16.7 e{+2}b{+2} {I11} with |a(45.72|g)=917. 
E$deduced from E|a'; no |g ray measured (1971Fo17). 
J$from systematics of even-even nuclei (1971Fo17). 


level_energy_unit: KEV
level_spin_parity: 0+
level_lifetime_unit: Y
level_comment:
T$from weighted average of 5 individual measurements of different {+252}Cf sources. Individual values were 2.6481 y {I20} (stat) {I28} (syst), 2.6468 y {I22} (stat) {I27} (syst), 2.6521 y {I16} (stat) {I16} (syst), 2.6451 y {I25} (stat) {I25} (syst), and 2.6510 y {I55} (stat) {I55} (syst). In the final weighted average, an additional contribution of 0.05% in quadrature was added to the systematic uncertainty. 


level_energy_unit: KEV
level_spin_parity: (7/2+)
level_lifetime_unit: D
level_comment:
J$allowed or first forbidden non-unique |b{+-} decays to 7/2+ g.s. and (9/2+) excited state in {+253}Es limits J to 7/2 or 9/2. Nilsson model suggests configuration=(|n 7/2[613]) for N=155. 
T$from 1969DrZZ; other: 17.6 d {I2} (1965Me02). Both results were deduced from the growth of {+253}Es (1965Me02) 


level_energy_unit: KEV
level_spin_parity: (7/2)+
level_lifetime_unit: D
level_comment:
MOMM1,MOME2$deduced from the weighted mean values for the ground state HFS parameters using new theoretical calculations. 


level_energy_unit: KEV
level_spin_parity: 0+
level_lifetime_unit: D
level_comment:
%A$from the |a and fission counts, the branching ratio was determined by 1968Be21 as |a/fission=0.00310 {I16}. Earlier measurement: %|a|?0.2, %SF|?99.8 (F. Asaro, I. Perlman- quoted by 1978LeZA) 
T$measured by 1963Ph01. This value was also recommended by 1965Me02. The partial SF half-life of 60.9 d {I9} was recommended by 2000Ho27; the SF branching of 99.69% {I2} yields T{-1/2}=60.7 d {I9}. Other half-life measurements: 61.9 d {I11} (1965Me02), 60.3 d {I11} (1957Hu70, revised by 1965Me02), 56.2 d (1956Fi11, reanalyzed by 1957Hu70), 60 d {I10} (1955Be99), 85 d {I15} (1955Ha35) 


level_energy_unit: KEV
level_energy_info: ;ERR=SY;ERR=?
level_spin_parity: [2+]
level_uncertain: S
level_comment:
E,J$level not seen experimentally. Energy and J|p here is from systematics of known 2+ g.s. band members in A=244-252 Cf isotopes. 


level_energy_unit: KEV
level_spin_parity: 0+
level_lifetime_unit: D
level_comment:
T$from Adopted Levels 
$Assumed that the ground state of {+254}Cf is populated indirectly by |g transitions from higher levels 


level_energy_unit: KEV
level_energy_info: ;ERR=SY;ERR=?
level_spin_parity: [2+]
level_uncertain: S
level_comment:
E,J$level not seen experimentally. Energy and J|p here is from systematics of known 2+ g.s. band members in A=244-252 Cf isotopes. Since the 84.2 level in {+254}Es is likely K|p=2+, |p7/2[633]~#|n 3/2[622] state, high log| {Ift} value of |?10 is consistent with K-forbiddenness for the |e transition 


level_energy_unit: KEV
level_spin_parity: (7/2+)
level_lifetime_unit: MIN
level_comment:
J configuration=(|n 7/2[613]) from Nilsson model (1994Cw02). Allowed, hindered |b{+-} decay to configuration=(|p 7/2[633]) with log| {Ift}=5.7 {I5} is consistent with this assignment. 
T from 1981Lo15 
%A calculated T{-1/2}(|a)|?4|*10{+10} min (1997Mo25) gives %|a|?2|*10{+-7} 


level_energy_unit: KEV
level_spin_parity: 0+
level_lifetime_unit: MIN
level_comment:
T$measured by 1980Ho04. 
$Only SF-decay mode has been observed. Possible |a decay branch can be estimated by various methods: 1. by requiring HF(|a to g.s. of {+252}Cm)=1.0, I|a=5.0|*10{+-7}% {I20} is deduced using r{-0}({+252}Cm)=1.533 fm {I20} from local r{-0} trend given in 1998Ak04, and Q(|a)({+256}Cf)=5560 {I100} (2017Wa10). The estimated intensity of 0.80 {I20} per |a decay for the |a to g.s. gives %|a=6.2|*10{+-7} {I30}. 2. from semiempirical Geiger-Nuttal formula, 1997Po18 calculated T{-1/2}(|a)=9|*10{+3} y, from which %|a=2.6|*10{+-7} is obtained. 3. theoretical calculations of 1997Mo25 yield T{-1/2}(|a)=1|*10{+12} s which corresponds to %|a=7.8|*10{+-8}. 


level_energy_unit: KEV
level_spin_parity: (1+)
level_lifetime_unit: S
level_comment:
%A,%EC,%ECSF$From 2017Ko02. %|eSF=16 {I6} per 100 |e decays reported in 2017Ko02 
J$From systematics and the proposed configuration. The assignment is tentative 
T$From implant-8190|a(t) and implant-8090|a(t). From the observed 15 implant-fission(t) events, a value of T{-1/2}=5 s {I2} was obtained. 
$E|a=8190 keV {I30} (27 events) and 8090 keV {I30} (60 events) in 2017Ko02, correlated with E|a=6954 keV {I20} of {+236}Cm. The implant-|a events were correlated within a 30 s time window. 
CONF$From systematics of Es (Z=99) isotopes, |p7/2[633] (i{-13/2}) and |p3/2[521] (f{-7/2}) orbitals are expected near the proton Fermi surface, while the |n5/2[633] (g{-9/2}) orbital is expected near the neutron Fermi surface for N=141 isotones. Thus, using the Gallagher-Moszkowski rule, one may expect K|p=1+, |p7/2[633]~#|n5/2[633] for the ground state and K|p=6+, |p7/2[633]~#|n5/2[633] for an excited isomeric state. K|p=1-, |p3/2[521]~#|n5/2[633] is a possible alternative. The assignments are tentative 


level_energy_unit: KEV
level_spin_parity: (1+)
level_lifetime_unit: S
level_comment:
%A,%EC,%ECSF$From 2017Ko02. %|eSF=16 {I6} per 100 |e decays reported in 2017Ko02 
J$From systematics and the proposed configuration. The assignment is tentative and proposed by compiler. 
T$From implant-8190|a(t) and implant-8090|a(t). From the observed 15 implant-fission(t) events, a value of T{-1/2}=5 s {I2} was obtained. 
$E|a=8190 keV {I30} (27 events) and 8090 keV {I30} (60 events) in 2017Ko02, correlated with E|a=6954 keV {I20} of {+236}Cm. The implant-|a events were correlated within a 30 s time window. 
CONF$From systematics of Es (Z=99) isotopes, |p7/2[633] (i{-13/2}) and |p3/2[521] (f{-7/2}) orbitals are expected near the proton Fermi surface, while the |n5/2[633] (g{-9/2}) orbital is expected near the neutron Fermi surface for N=141 isotones. Thus, using the Gallagher-Moszkowski rule, one may expect K|p=1+, |p7/2[633]~#|n5/2[633] for the ground state and K|p=6+, |p7/2[633]~#|n5/2[633] for an excited isomeric state. K|p=1-, |p3/2[521]~#|n5/2[633] is a possible alternative. The assignments are tentative 


level_energy_unit: KEV
level_lifetime_unit: S
level_comment:
T$from 2020Po07, deduced from five EVR-|a (not #3 event in authors' Table I) correlated events. Five lifetimes are: 0.6 s, 14.37 s, 1.20 s, 10.00 s and 7.65 s. This value can be compared with 6 s {I2} in 2017Ko02: Phys. Lett. B764, 265 (2017) 
$Average E|a=8120 {I77} (2020Po07) emitted by the decay of {+240}Es, from five E|a values in authors' Table I 


level_energy_unit: KEV
level_lifetime_unit: S
level_comment:
T$from 2020Kh08, deduced from four EVR-|a correlated events. Five mean lifetimes were: 5.6 s, 15.5 s, 2.99 s and 27.4 s. This value can be compared with 6 s {I2} in 2017Ko02: Phys. Lett. B764, 265 (2017) 
$E|a=8050 (2020Kh08) from event #2, emitted by the decay of {+240}Es. This can be compared with a strong |a of 8090 keV {I30}, and a somewhat weaker |a of 8190 keV {I30} in 2017Ko02. 


level_energy_unit: KEV
level_lifetime_unit: S
level_comment:
T$From 1996Ni09 
J$Systematics (see 1972El21) suggests that the g.s. has the configuration 3/2[521] or 7/2[623] 


level_energy_unit: KEV
level_lifetime_unit: S
level_comment:
$|a-decay mode has been seen by 2020Kh08 and 1996Ni09, but branching ratio is unknown. From theoretical calculations in 2019Mo01 (At. Data Nucl. Data Tables 125, 1), T{-1/2}(|b decay)=9.9 s, and T{-1/2}(|a)=389 s, which suggests %|e+|b{++}=97, %|a=3. 
T$from 2020Kh08, deduced from nine EVR-|a correlated events. Nine mean lifetimes were: 5 s, 20 s, 4.73 s, 0.24 s, 2.86 s, 6.87 s, 11.5 s, 15.1 s and 2.97 s. This value can be compared with 8 s {I+6-4} in 1996Ni09: Zeit. Physik A356, 11. 
$E|a=8132 {I20}, compiler's unweighted average from five events with values of 8140, 8120, 8120, 8090 and 8190 keV, measured by 2020Kh08. This can be compared with a strong |a of 8113 keV {I20} in 1996Ni09. 


level_energy_unit: KEV
level_lifetime_unit: S
level_comment:
%EC$From 2010An08. 
T$From 2010An08. Others: 11 s {I3} (2000Sh10), 16 s {I+6-4} (1996Ni09) 
$Probability of |e-delayed fission=1.3% {I+12-7} (2010An08), 0.6% {I2} (2000Sh10) 


level_energy_unit: KEV
level_lifetime_unit: S
level_comment:
T$from 662|a (t) events. Other: 18.2 s {I+45-30} from 26 fission events (2024Kh02) 
$|eDF = 0.015 {I4} (2024Kh02), from total Er-|a and Er-fission events, and using the |e({+242}Es)=59 % {I3} 
%EC$from observed |a events from {+242}Es and |a events from the |e daughter, {+242}Cf. 


level_energy_unit: KEV
level_energy_info: ;OFF=X
level_spin_parity: (7/2+)
level_lifetime_unit: S
level_comment:
%A$from the ratio of correlated {+247}Md-{+243}Es parent-daughter |a decays and uncorrelated {+247}Md |a decays (2010An08). Other: estimation of %|a>30 and %|e<70 by 1973Es02 from intensities of |a's from {+243}Es and {+243}Cf decays (only strongest |a's from each nucleus were observed). 
T$weighted average of 21 s {I2} (1973Es02), 21 s {I4} (1976GhZU), 21 s {I5} (1989Ha27), 19 s {I4} (1994HoZW), 23 s {I3} (2010An08). 
J$Nilsson orbit systematics (see, for example, 1972El21) suggest either 3/2[521] or 7/2[633] Nilsson state for the {+243}Es ground state. 


level_energy_unit: KEV
level_energy_info: ;OFF=Z
level_spin_parity: (1/2-)
level_comment:
J$unhindered |a decay from the 0.25 s isomer in {+247}Md with configuration 1/2[521]. 
E$z-y<150 keV as non-observation of coincidences between K x-rays and the 8783|a suggests that energy difference between (1/2-) and (3/2-) states is lower than K shell binding energy. 


level_energy_unit: KEV
level_energy_info: ;OFF=X
level_spin_parity: (7/2+)
level_lifetime_unit: S
level_comment:
%A$from the ratio of correlated {+247}Md-{+243}Es parent-daughter |a decays and uncorrelated {+247}Md |a decays (2010An08). Other: estimation of %|a>30 and %|e<70 by 1973Es02 from intensities of |a's from {+243}Es and {+243}Cf decays (only strongest |a's from each nucleus were observed). 
T$from 7893|a(t) relative to {+247}Md |a decays (2010An08). 
J$proposed configuration 7/2[633] (2010An08). 


level_energy_unit: KEV
level_energy_info: ;OFF=Z
level_spin_parity: (1/2-)
level_comment:
J$proposed configuration = 1/2[521], HF=2.5 from (1/2-) parent. 
E$z-y<150 keV as non-observation of coincidences between K x-rays and the 8783|a suggests that energy difference between (1/2-) and (3/2-) states is lower than K shell binding energy of 146.5 keV. 


level_energy_unit: KEV
level_energy_info: ;OFF=X
level_lifetime_unit: S
level_comment:
E$from Adopted Levels of {+243}Es in ENSDF database 
T$from recoil-|a(t) in 2019Br06 
$Production cross section=37 nb {I10} at E(beam)=210.0 MeV {I10} without degrader, 32 nb {I9} at E(beam)=208.0 MeV {I10} with degrader (2019Br06) 


level_energy_unit: KEV
level_lifetime_unit: S
level_comment:
$Alpha and electron capture branchings were derived by 1973Es02 from alpha counts from {+244}Es and from {+244}Cf decays, assuming that {+244}Cf decays 100% by |a. 
$Delayed fission following electron-capture decay to {+244}Cf was observed by 1980Ga07 and by 2002Sh02. 
$Relative probability for electron-capture delayed fission, defined as the ratio of number of delayed fission events to the number of electron-capture events, was obtained by 2002Sh02 from measured fission counts/{+244}Cf alphas to be 0.00012 {I4}. Delayed fission events were identified by the half-life of {+244}Es, the |e parent. 
$Cross sections for {+244}Es production and for delayed fission were measured, and the relative delayed-fission probability was deduced by 1980Ga07 to be about 0.00010. 
T$Measured by 1973Es02 from alpha counts. Other measurements: 40 s {I5} (1971EsZY), 38 s {I11} (from delayed-fission counts) (2002Sh02) 


level_energy_unit: KEV
level_spin_parity: (3/2-)
level_lifetime_unit: S
level_comment:
%A$from counting of |a decays of {+249}Md and its |a-decay daughter {+245}Es (2019Br06) Others: %|a=80 {I+20-50} (1985He22), %|e=20 {I+50-20} (1985He22), %|a= 40 {I10} (1973Es01). 
T$Weighted average of 72 s {+60-24} (2022Te01), 65 s {I6} (2019Br06), 55 s {I+12-18} (2008Ga25), 80 s {I+96-28} (1985He22), 66 s 6 (1989Ha27), and 80 s {I9} (1967Mi06) 
J$Systematics of Nilsson orbitals suggests either the 3/2[521] or the 7/2[633] state. 3/2[521] and 7/2[633] orbitals are close in energy and either could be the g.s. However, 2005He27 estimate that 7/2+ bandhead of 7/2[633] band lies |?30 keV above the 3/2- bandhead of 3/2[521] band, hence the g.s is assigned (3/2-) 


level_energy_unit: KEV
level_energy_info: ;OFF=X
level_spin_parity: (7/2+)
level_comment:
$Configuration=7/2[633] 
E$x |?30 keV (15 {I+-15} keV)(2005He27) 
J$From 7/2[633] Nilsson orbital assignment (2005He27) and E1 253.2|g from 7/2- 253.2+X level 


level_energy_unit: KEV
level_energy_info: ;OFF=X;ERR=?
level_spin_parity: (9/2+)
level_comment:
J$From systematics of |g feeding from the (7/2-) level in {+243}Es (2014Ne14), {+247}Es (2015Ne04) and {+249} (2012He09), {+251}Es (2005He27) 


level_energy_unit: KEV
level_energy_info: ;OFF=X
level_spin_parity: (7/2-)
level_comment:
$Configuration=7/2[514] 
$Favored |a decay from J|=(7/2-) {+249}Md and 7/2[514] Nilsson orbital assignment (2005He27) 


level_energy_unit: KEV
level_spin_parity: (3/2-)
level_lifetime_unit: S
level_comment:
J$Systematics of Nilsson orbitals suggests either the 3/2[521] or the 7/2[633] state. 3/2[521] and 7/2[633] orbitals are close in energy and either could be the g.s. However, 2005He27 estimate that 7/2+ bandhead of 7/2[633] band lies |?30 keV above the 3/2- bandhead of 3/2[521] band, hence the g.s is assigned (3/2-) 


level_energy_unit: KEV
level_energy_info: ;OFF=X
level_spin_parity: (7/2+)
level_comment:
E$x |?30 keV {I15} (2005He27). x=30 keV {I21} deduced by evaluator (see comments at Ex=253.2+x 
$Configuration=7/2[633] 


level_energy_unit: KEV
level_energy_info: ;OFF=X
level_spin_parity: (7/2-)
level_comment:
E$x=30 keV {I21} deduced by evaluator using Q|a (g.s.)=8441 keV {I18} and E|a=8026 keV {I10} 
$Configuration=7/2[514] 


level_energy_unit: KEV
level_energy_info: ;OFF=X
level_lifetime_unit: MIN
level_lifetime_info: ;ISO=M
level_comment:
$%|a,%|e: From |a/|e=0.11 {I2} (1967Mi06) 
$%|e-f|?0.003, |e delayed fission from 1980Ga07. 
J$From single particle systematics the expected configurations are (|n,5/2[622]) ({+239}U, {+241}Pu, {+243}Cm) and (|p,7/2[633]) ({+249}Es, {+253}Es) or (|p,3/2[521]) ({+245}Es, {+251}Es). The first combination leads to J|p=6+ and 1+, the second to J|p=4- and 1-. In both cases, the high spin level is expected to be lower in energy than the low spin level (Gallagher-Moszkowski rule). 1987So10 predicts the existence of 4-, 1- isomers in this nucleus. 
T$Weighted average of 6.0 min {I12} (2001Sh09), 8.2 min {I36} (1989Ha27) and 7.7 min {I5} (1967Mi06). Other: 8 min (1980Ga07). 


level_energy_unit: KEV
level_energy_info: ;OFF=X
level_spin_parity: (7/2+)
level_comment:
E LEVEL ENERGY HELD FIXED IN LEAST-SQUARES ADJUSTMENT 
$Proposed configuration=7/2[633] (1989Ha27) 
E$The assignment to g.s. is not certain; 3/2[521] and 7/2[633] orbitals are close in energy and either could be the g.s., 2005He27 estimate that 7/2+ bandhead of 7/2[633] band lies |?30 keV above the 3/2- bandhead of 3/2[521] band. 


level_energy_unit: KEV
level_energy_info: ;OFF=X
level_spin_parity: (9/2+)
level_comment:
E$The unobserved transition depopulating this level is shown by 2006Ch52 to be a highly-converted (possibly M1) transition. 
J$Suggested by theoretical calculations in 2006Ch52. 


level_energy_unit: KEV
level_energy_info: ;OFF=X
level_spin_parity: (7/2-)
level_comment:
$Proposed configuration=7/2[514] (based upon multipolarities proposed for depopulating |g transitions). 


level_energy_unit: KEV
level_energy_info: ;OFF=X
level_spin_parity: (7/2+)
level_lifetime_unit: MIN
level_comment:
E$X|?30 keV 
E LEVEL ENERGY HELD FIXED IN LEAST-SQUARES ADJUSTMENT 
$Proposed configuration=7/2[633](1989Ha27) 
$Observation of the ground-state in {+247}Fm |e decay is indirect. 
$|a branching was estimated by 1967Mi06 from observed |a yield and calculated total cross section for {+238}U({+14}N,{+5}N) reaction. 
J$Analogy to {+249}Es suggests 7/2[633] state. 
T$From 1989Ha27. Others: 5.0 min {I3} (1967Mi06), 4.7 min {I3} (1973Es01). 


level_energy_unit: KEV
level_spin_parity: (2-,0+)
level_lifetime_unit: MIN
level_comment:
J analogy to {+249}Es, {+251}Es, {+253}Es isotopes suggests either |p3/2[521] or |p7/2[633] Nilsson state for the 99{+th} proton and analogy to {+243}Pu, {+245}Cm, {+247}Cf suggests |n7/2[624] orbital for the 149{+th} neutron state. Therefore, the configuration is either K|p=2-: |p 3/2[521], |n7/2[624] or K|p=0+: |p7/2[633], |n7/2[624]. 
T$weighted average (min) of 23 {I3} (2001Sh09), 28 {I5} (1970Ah01), and 25 {I5} (1956Ch67). Other: 19 {I13} (1989Ha27) 
%EC$|e/|a|?400 was estimated by 1956Ch67 from observed |a counts of {+248}Es and {+248}Cf decays. This gives %|a|?0.25. The evaluator assigns this as <0.6 to get |e=99.7 {I3} 
$|e-delayed fission has been measured by 1980Ga07, who report 3|*10{+-5}% and by 2001Sh09 who report 3.5|*10{+-4}% {I18}, a factor of 10 larger 


level_energy_unit: KEV
level_spin_parity: 7/2+
level_lifetime_unit: MIN
level_comment:
$%|a=0.57 {I8} from |a/K-xray= 0.007 {I7} (1970Ah01), I(K-xray)= 81.8 % {I5} (1976Ah07) and I|a/I(|a+|e)=5.7|*10{+-3} {I8} (1976Ah07) 
$Configuration=(|p7/2[633])(2012He09) 
J$From log| {Ift}=6.7 to 9/2- g.s. and log| {Ift}=7.2 to 5/2+ level in {+249}Cf limits J to 7/2; log| {Ift}=8.9 to 11/2- level in {+249}Cf rules out J|p=7/2- 
T$From weighted average of half-lives from decay measurement of the 379.5|g from the {+249}Es |e decay: 102 min {I42} (1989Ha27), 102.2 m {I6} (1976Ah07) and 1.7 h {I1} (1970Ah01). Others: 1.8 h (1956Ha80) 


level_energy_unit: KEV
level_spin_parity: (7/2-)
level_comment:
E$from E|g=353.2 {I4} 
$Configuration=|p7/2[514] 
J$(E1) 353.2|g to 7/2+ g.s; from favored |a decay from (7/2-) {+253}Md. Alpha hindrance factor|?1 was deduced by 2012He09, based on a single 7103|a branch with theoretical half-life from 1980Po10 and 1983Ru11 


level_energy_unit: KEV
level_spin_parity: (6+)
level_lifetime_unit: H
level_comment:
T measured by 1977Fr03. Earlier measurement: 8.3 h {I2} (1970Ah01). 
J the log| {Ift} values for |e decays to (5)- and (6)- states in {+250}Cf suggest J=5 or 6. 
In analogy to {+245}Pu, {+247}Cm and {+249}Cf, the 155th odd neutron probably is in the n 9/2[734] state; analogy to {+249}Es suggests p 3/2[521] orbital, analogy to {+251}Es, {+253}Es suggests p 7/2[633] for the 99th proton. The most probable assignment is, therefore, 6+,(p 3/2[521],n 9/2[734]). 
The |e decays to 1457-, 1478- and 1499-keV levels in {+250}Cf are consistent with |e transitions from p 7/2[633] to n 9/2[734], from p 3/2[521] to n 3/2[622], and from p 3/2[521] to n 1/2[620] states, respectively. 
|a decay was not observed, and an upper limit of 3% was given by 1970Ah01. 


level_energy_unit: KEV
level_energy_info: ;OFF=X
level_spin_parity: 1(-)
level_lifetime_unit: H
level_lifetime_info: ;ISO=M1
level_comment:
T measured by 1980Ah03; earlier measurement: 2.1 h {I2} (1970Ah01). 
J J=1 from the log| {Ift} values for |e decays to 0+, 2+, and 2- states in {+250}Cf. 1980Ah03 assigned 1-,(p 7/2[633],n 9/2[734]) configuration. 
Only the |e decay was studied; no |a's were observed. 
E the level energy has not been determined. The authors of 1980Ah03 assigned this level to an isomeric state by using the Gallagher-Moszkowski rule. The 8-,(p 7/2[633],n 9/2[734]) state is expected to lie lower than the 1-,(p 7/2[633],n 9/2[734]) state, suggesting, therefore, the 1- is not the g.s. 


level_energy_unit: KEV
level_spin_parity: 3/2-
level_lifetime_unit: H
level_comment:
T$From 1970Ah01. Other: 1.5 days (1956Ha80). 
%A$Deduced by evaluator from the observed ratio of |a-decay to K x-rays I(|a)/I(X{-K})=0.008 {I2} (1970Ah01) and K x-rays per electron capture I(X{-K})/I(|e)=0.64 {I5} (2005Ah09). 
J$Favored |a decay to 3/2{+-} ground state of {+247}Bk (1979Ah03). Further evidence comes from population of the 3/2{+-}[521] band but not the 7/2{++}[633] band in electron-capture decay to {+251}Cf (1970Ah01). Spectroscopic factors measured in {+250}Cf(|a,t) support this assignment. 


level_energy_unit: KEV
level_spin_parity: (7/2)+
level_comment:
J$log| {Ift}=6.75 from (9/2-) {+251}Fm limits J to 7/2, 9/2, 11/2; Nilsson model gives 7/2{++}[633] as expected low-energy level. Positive parity based on known M1+E2 transition from 7/2{+-}[514] level. 


level_energy_unit: KEV
level_spin_parity: 7/2-
level_comment:
J$Favored |a decay from 7/2{+-} {+255}Md, E1 component of 405.6-keV |g to 9/2{++} state and M1 component of 429.7-keV |g to 5/2{+-} state constrain spin to be 7/2{+-}. 


level_energy_unit: KEV
level_spin_parity: (11/2)+
level_comment:
J$E2 |g to (7/2{++}) and |g with M1 component to (13/2{++}) require 11/2{++}. Positive parity due to E2 decay to (7/2){++} level. 


level_energy_unit: KEV
level_spin_parity: (13/2)+
level_comment:
J$M1+E2 |g decays to 11/2{++}, 13/2{++}, and 15/2{++} requires 13/2{++}. E2 to (9/2){++} state requires positive parity. 


level_energy_unit: KEV
level_spin_parity: (11/2)+
level_comment:
$Interpreted as a three-quasiparticle state, but a configuration could not be definitively assigned. See {+251}Fm |e decay. 
J$M1 component of |g to 13/2{++} and E2 |g to 7/2{++} requires 11/2{++}. 


level_energy_unit: KEV
level_spin_parity: (11/2)+
level_comment:
$Interpreted as a three-quasiparticle state, but a configuration could not be definitively assigned. The most likely configuration is stated to be |[|n9/2-[734]~#|n5/2+[622]~#|p3/2-[521]|]11/2+. 


level_energy_unit: KEV
level_spin_parity: (9/2-)
level_uncertain: ?
level_comment:
E$From |DE{-|a} assuming that the 7274-keV |a-decay populates the 9/2{+-} member of the 7/2{+-}[514] band. This is rather different than E(level)=523 {I2} keV from 250Cf(|a,t), and should be regarded as tentative. Not included in Adopted Levels. 


level_energy_unit: KEV
level_spin_parity: (5-)
level_lifetime_unit: D
level_comment:
%EC,%A$from 1973Fi06 based on the measured ratio of |a and 785.1|g (0.7 photon per |e decay) intensities. T{-1/2}(|b{+-})>20 y (1956Ha80). 
J$|b{+-} decay to (3+) with log| {Ift}=8.3 {I4}; no |b{+-} and |e branches to K{+|p}=0+ g.s. bands in {+252}Cf and in {+252}Fm. Possible K{+|p}=5-, |p3/2{+-}[521]~#|n7/2{++}[613] configuration for {+252}Es g.s. is consistent with its |b decay and with the |a decay from {+256}Md. 
T$from 1977Ah03. Other: |?140 d (1956Ha80), 350 d {I50} (1973Fi06), 471 d {I5} (1975AhZW). 


level_energy_unit: KEV
level_spin_parity: (1-)
level_comment:
J$favored |a from {+256}Md g.s, which was suggested to be J=1-, K=0 with configuration |p7/2{+-}[514]~#|n7/2{++}[613] (1993Mo18). 


level_energy_unit: KEV
level_spin_parity: (1-)
level_comment:
J$Favored |a from {+256}Md g.s, which was suggested to be J=1-, K=0 with configuration |p7/2{+-}[514]~#|n7/2{++}[613] (1993Mo18). 


level_energy_unit: KEV
level_spin_parity: 7/2+
level_lifetime_unit: D
level_comment:
J$7/2 from optical spectroscopy (1970Wo14), |p=+ from configuration=(|p 7/2[633]) from |m (1972El21) 
T$from 20.467 d {I24} (1969DrZZ); others: 20.50 d {I17} (1987Po22), 20.31 d {I16} (1982Po13), 20.7 d {I3} (1966Rg01), 20.03 d {I1} (1956Jo09) 
%SF$from %|a/%SF=1.15|*10{+7} {I3} (1965Me02), resulting in T{-1/2}(SF)=6.4|*10{+5} y {I2} 
2000Ho27 have recommended SF half-life as 6.3|*10{+5} y {I2} from weighted average of values given by 1954Fi14, 1956Jo09 and 1965Me02. Other SF half-life calculations: 2005Re16, 2004Ro01 


level_energy_unit: KEV
level_comment:
J$This level has been observed in the alpha decay of {+257}Md and assigned the Nilsson state 3/2-3/2[521] (1993Mo18). However, there is no evidence of being populated from {+253}Fm (1/2+1/2[620]) as it would be expected. A 106-keV M2 |g-ray transition to the ground state (7/2+7/2[633]) in {+253}Es has not been observed (1967Ah02). 


level_energy_unit: KEV
level_spin_parity: (7/2-)
level_comment:
J$|g's to 7/2+ g.s. and (9/2+) level indicate J|p 5/2+,7/2,9/2+. From Nilsson model the most likely single-particle configuration=(|p 7/2[514]). 


level_energy_unit: KEV
level_comment:
Conversion electrons from |g-ray decay to the ground state of {+253}Es have not been observed in {+253}Fm |e decay. Thus, a 3/2-3/2[521] Nilsson state assignment (1993Mo18) to this level could not be confirmed. 


level_energy_unit: KEV
level_spin_parity: (7+)
level_lifetime_unit: D
level_comment:
MOMM1$from |a(|q) in oriented nuclei, sign is unknown (2009Se09,2011Gu11,2010Gu05) 
$A{-2}=+0.47 {I7}; A{-4}=-0.030 {I14} at 90 mK for the 6429 keV |a transition from this level (2009Se09,2011Gu11) 
T$measurement by 1975Ah04. Other measured half-lives are: 266 d {I4} (1988Po05), 276 d {I76} (1962Un01), 480 d {I70} (1958Sc35), 272 d (from G.G. Harvey et al. (1955) as quoted by 1964Hy02 on page 960) 
J$analogy to {+253}Es suggests |p7/2[633] for the 99th proton, and analogy to {+255}Fm suggests |n7/2[613] for the 155th neutron state. From favored |a to (7+) {+250}Bk, and |a(|q) from oriented nuclei (2005Se08), a high-spin assignment for the {+254}Es g.s. is consistent with weak |b and |e branches to {+254}Fm and {+254}Cf, respectively. No |a branch from 51.5-d {+258}Md is expected. The observation of a weak |a suggests some admixture with other configurations. 
$1985Ok04 determined |b{+-} decay/total=1.74|*10{+-6} {I8} from relative intensities of {+254}Es and {+254}Fm |a's; {+254}Fm was in equilibrium with {+254}Es. Earlier measurement: %|b{+-}<2|*10{+-4} (1966Mc02). 
$%SF<3|*10{+-6} is from T{-1/2}(SF)>2.5|*10{+7} y, measured by 1967Fi03. Other measurement: 1965Me02. 
$A partial half-life of |?8|*10{+3} s for |e decay, calculated by 1973Ta30 from the |b gross theory, suggests %|e|?0.03%. 


level_energy_unit: KEV
level_spin_parity: 2+
level_lifetime_unit: H
level_lifetime_info: ;ISO=M1
level_comment:
T$measurement by 1962Un01 from |b and |g counting, weighted average of three results. Other measurements: 38.5 h {I10} (1956Jo09), 36.3 h (1954Ch23), 37 h {I1} (1954Fi14) 
$%|b{+-}/%|a=302 {I9} (1973Ah04) from intensities of 39-h {+254}Es and {+254}Fm |a decays 
$%|e/%|b{+-}=7.8|*10{+-4} {I6} (1963Ph01) from the rates of |a emission and spontaneous fission in {+254}Fm and {+254}Cf daughters, chemically separated from {+254}Es. 
$%IT<3 was deduced by 1973Ah04 by following growth in the 6429|a peak of 275.7-d {+254}Es. %IT is probably much less than 3% as gamma transition to (7+) g.s. requires M5 multipolarity. 
$%SF is calculated from T{-1/2}(SF)>10 y, listed by 1954Fi14. 
$All branchings are adopted from the experimental |b{+-}/|a, |e/|b{+-}, T{-1/2}(SF), and the upper limit for isomeric transition given above. Other measurements: %|b{+-}/%|a=382 {I30} (1967Fi03). 
J$spin was measured by 1975Go05 by using atomic-beam resonance method; parity is from the hindrance factor of 6382|a to the positive-parity level at 211-keV in {+250}Bk, and agreement of measured |m with theoretical calculations (see 1975Go05) for a state with configuration=|p7/2[633]~#|n3/2[622], 2+ 
$From their measured spectroscopic quadrupole moment, 1975Go05 calculated the deformation parameter, |e=0.21. 
E$From Q(|a)({+254}Es 39.3 h)=6699.9 {I20} (based on Q(|a) for g.s. in 2017Wa10), and E|a=6383.9 {I20}, 6383.9 {I20} recalibrated |a from 39.3 h {I2} {+254}Es level to the 211.82-keV, 35.587 levels in {+250}Bk, respectively. 


level_energy_unit: KEV
level_uncertain: ?
level_comment:
E$existence of a level at 214.7 keV is not certain, as it relies on only one |g ray to ground state, and another |g placed from the 402-keV level, from 189.1- and 214.7-keV gammas forming a cascade, whose ordering is not certain 
J$1993Mo18 suggested that this level may be the 6- state with configuration=|p3/2[521]~#|n9/2[615]. A |g transition from this level to the g.s. with 7+, |p7/2[633]~#|n7/2[613] configuration would be highly hindered. Theoretical analysis by 2007Sa02 disagrees with the assignment of 6- bandhead for the proposed configuration, as the calculated bandhead energy for this configuration is predicted by 2007Sa02 as above 350 keV 


level_energy_unit: KEV
level_spin_parity: (7+)
level_uncertain: ?
level_comment:
$No |g decay of this level is known 
J$possible (M1+E2) |g from (8+) level. Assignment by 1993Mo18 as 7- member of K|p=6- band is not adopted here 


level_energy_unit: KEV
level_spin_parity: (8+)
level_comment:
J$1993Mo18 proposed this level as the 8- member of the suggested K|p=6- band. For K|p=8-, |p7/2[514]~#|n9/2[615] of the {+258}Md g.s., |a hindrance factor of 28 for the 6788|a is inconsistent with the proposed configuration (HF of such an |a transition between is expected as much greater than 100). 2007Sa02, in their theoretical analysis assign this level as K|p=8+, J|p=8+ with configuration= |p7/2[633]~#|n9/2[615] 


level_energy_unit: KEV
level_comment:
$The gamma decay of this level is largely unknown 
J$(7-) from theoretical analysis by 2007Sa02 with configuration= |p7/2[514]~#|n7/2[613], K|p=7- 


level_energy_unit: KEV
level_spin_parity: (8-)
level_comment:
J$favored |a decay from 51.50-d {+258}Md. Configuration of this state should be the same as that of the parent 51.50-d, {+258}Md which is probably 8- with main configuration=|p7/2[514]~#|n9/2[615]. If the ground state (7+) has configuration=|p7/2[633]~#|n7/2[613], large admixtures in g.s. or in 447.9-keV level configurations are expected because of the 447.9-keV |g transition which would be forbidden (since otherwise, it would require both the proton and the neutron states to change) 
$By assuming that the 80.0- and 171.1-keV levels are the 8+ and 9+ states of the g.s. rotational band, 1993Mo18 pointed out that the relative intensities of the 276.8-, 376.8- and 447.9-keV gammas disagree with the expected relative I|g values to 7+, 8+, and 9+ rotational band members; and they proposed that the 447.9-keV level has an admixture from another rotational band. 


level_energy_unit: KEV
level_spin_parity: (7+:10+)
level_comment:
J$gammas to (8+) and (9+). 1993Mo18 proposed this level as 9- member of K|p=6- band, which is not adopted here 


level_energy_unit: KEV
level_spin_parity: (8+)
level_comment:
J$large lower limit for HF is consistent with 8+ member of g.s. rotational band, however, other possibilities are not excluded. 


level_energy_unit: KEV
level_spin_parity: (9+)
level_comment:
J$large lower limit for HF is consistent with 9+ member of g.s. rotational band. 
$Note that there is a large non-physical negative transition intensity balance at the 171-keV level. 


level_energy_unit: KEV
level_uncertain: ?
level_comment:
J$6- bandhead (1993Mo18) with configuration=|p3/2[521]~#|n9/2[615], but 2007Sa02 analysis did not support this assignment, as the calculated energy for the bandhead for this configuration is above 350 keV 


level_energy_unit: KEV
level_spin_parity: (8+)
level_comment:
$The gamma decay of this level is not fully known 
J$8- member of 6- band (1993Mo18), but 8+ in the theoretical analysis by 2007Sa02 with configuration=|p7/2[633]~#|n9/2[615] 


level_energy_unit: KEV
level_spin_parity: (7-)
level_comment:
$The gamma decay of this level is largely unknown 
J$(7-,8-) (1993Mo18); 7- in the theoretical analysis by 2007Sa02 with configuration=|p7/2[514]~#|n7/2[613] 


level_energy_unit: KEV
level_spin_parity: 7
level_comment:
J$from fit to hyperfine spectrum (2022No01) 
MOMM1,MOME2$from hyperfine parameters for the ground state taking as a reference |m=4.10 {I7} (syst) {I12} (syst) and Q=6.7 {I8} for {+253}Es. 


level_energy_unit: KEV
level_spin_parity: (7/2+)
level_lifetime_unit: D
level_comment:
Deduced by evaluators from %|a/%|b{+-}=0.087 {i4}; and %|b{+-}/%SF=2.22|*10{+4} {i10} (1967Fi03). Other: %|a/%|b{+-}=0.093 {i3} (1966Rg01) 
T{-1/2}(SF)=2600 y {i100} (1967Fi03,2000Ho27). 
J configuration=(|p 7/2[633]) from Nilsson model (1994Cw02). Pattern of |a decay to {+251}Bk is consistent with this assignment. 
T from 1966Rg01. Other: 38 d {I2} (1987Po22) 


level_energy_unit: KEV
level_spin_parity: (1+,0-)
level_lifetime_unit: MIN
level_comment:
T$measured by 1981Lo15. The authors could not exclude the possibility that although no evidence was observed, some 7.6-h {+256}Es could have been produced in {+255}Es(n,|g),E=thermal reaction. 1981Lo15 pointed out that if this isomeric state was also produced, then the actual half-life should be slightly smaller than the given value. 
J$in analogy to {+253}Es and to {+257}Fm, possible configuration= |p7/2[633]~#|n9/2[615] or |p3/2[521]~#n3/2[622]. 
E$Gallagher-Moszkowski rule predicts the 1+ state with configuration=|p7/2[633]-|n9/2[615] to be lower in energy than the 8+ state with configuration=|p7/2[633]+|n9/2[615]. Similarly, the 0- state with configuration=|p3/2[521]-|n3/2[622] is expected to be lower than the 3- state with configuration=|p3/2[521]+|n3/2[622]. The low-spin 25.4-min state is adopted as the ground state of {+256}Es on this basis only in the absence of any experimental evidence. 
$Only the |b{+-} decay mode is observed. The theoretical calculations by 1997Mo25 give T{-1/2}(|a)=1|*10{+10} s for |a partial half-life. 


level_energy_unit: KEV
level_energy_info: ;OFF=X
level_spin_parity: (8+)
level_lifetime_unit: H
level_lifetime_info: ;ERR=?;ISO=M1
level_comment:
T$measured by 1976HoZB. 
$Assignment: {+254}Es(t,p), chem, parent of {+256}Fm (1976HoZB, 1976HuZU, 1976HoZF). Production |s of the isomer also measured by 2013Kr14 in {+238}U+{+238}U reaction at GSI. 
J$|b decays to the 1425.5-, 1560.2-keV levels in {+256}Fm and no decay to low-spin states imply J=6,7,8. Possible configuration= |p7/2[633]+|n9/2[615] is consistent with |b{+-} decay to the proposed 7- state with configuration=|p7/2[633]+|p7/2[514] state in {+256}Fm at 1425.5 keV. 
$No Es x-rays were observed, suggesting no isomeric transition to {+256}Es g.s., and no |a particles to {+252}Bk were found (1976HoZB) 
$|b-delayed-fission activity was observed by 1989Ha10, and the measured |b-delayed-fission probability (number of delayed fissions/100 |b{+-} decays of 7.6-h {+256}Es) was measured to be 2|*10{+-5} or 0.002 per 100 |b{+-} decays 


level_energy_unit: KEV
level_lifetime_unit: D
level_comment:
J possibly 7/2[633] from analogy with {+253}Es 
T from 1987Po22, 1991Po17 (followed |g rays accompanying |b-decay). Other: 8.7 d {I9} (followed neutron activity from SF, 1987Po22) 
%A calculated T{-1/2}(|a)|?2|*10{+6} d (1997Mo25) 


level_energy_unit: KEV
level_spin_parity: 0+
level_lifetime_unit: MS
level_comment:
Only SF decay was observed (1975Te01). 
|a and |e branchings are estimated to be small from calculated partial half-lives: T{-1/2}(|a)=20-250 ms (1975Te01), 10{+0.62} s (2019Mo01); T{-1/2}(|b{++})=9.7633 s (2019Mo01), |?100 s (1973Ta30). See also 1988Sa35 for calculations of partial half-lives for decays by Sn emission, as well as for SF and |a decays. See 2000Po25 and 1997Po18 semiempirical formulas deduced for T{-1/2}(|a) from experimental half-lives in the heavy-nuclei region. 
T measured by 1975Te01. This half-life is recommended also by 2000Ho27. 


level_energy_unit: KEV
level_spin_parity: (7/2-)
level_lifetime_unit: MS
level_comment:
T$from evaporation residue (Er)-|a(t) in 2008Kh10 with 1400 measured correlations. Other: 221 ms {I12} from Er-SF(t) (2008Kh10); 180 ms {I+80-40} (1981Mu12) from 10 Er-|a correlations. 
J$analogy with {+237}Pu and {+235}U suggest J|p=7/2- of the 7/2[743] Nilsson state. The 1/2[631] state is 0.0765 keV above the 7/2[743] state in {+235}U, 145.5 keV in {+237}Pu, |?152 keV in {+239}Cm, and |?150 keV in {+241}Cf. Calculations in 2011Ad15 also give J|p=7/2- for the ground state. 
%A$other: estimated as 40% {I20} (1981Mu12) by parent-daughter correlation technique where alphas from {+243}Fm and from its daughter {+239}Cf were counted, and by assuming the |a branching of {+239}Cf is 100%. The alpha branching of {+239}Cf has not been determined. 
$1975KoYO=N.N.KOLESNILOV AND A.G.DEMIN, JINR P6-9421 (1975) 


level_energy_unit: KEV
level_lifetime_unit: MS
level_comment:
T,%A$from 2008Kh10. These values are also reported in 2020Kh10. 
$E|a=8546 {I8} is observed from the ground state and proposed to populate an excited state in {+239}Cf. 


level_energy_unit: KEV
level_spin_parity: 0+
level_lifetime_unit: MS
level_comment:
$SF, |a decay, and |e branching ratios deduced by 2008Kh10. 
T$From 2008Kh10. Others (from heavy ion induced reactions): 3.47 ms {I26} (2013SvZZ), 4.3 ms {I+45-16} (1989Il02), 3.0 ms {I5} (1979Ga06: as recommended by 2000Ho27), 4.0 ms {I5} (1975Og02), 3.3 ms {I5} (1967Nu01) 
$Q{-|a}<8.6 MeV (2008Kh10) 


level_energy_unit: KEV
level_lifetime_unit: MS
level_comment:
$SF, |a decay and |e branching ratios deduced by 2008Kh10 
$%|a: The |a decays observed in 2008Kh10, could not be distinguished from decay of ground and isomeric states of {+214}Fr. Hence an upper limit was deduced for the |a branching 
$%|e: An upper limit for the |e branching was deduced by 2008Kh10 by observing |a decays from {+244}Cf. {+244}Cf is thought to be the grand-daughter from |e decay of {+244}Fm ({+244}Fm|){+244}Es|) {+244}Cf). However authors (2008Kh10) state that the events from {+244}Cf are likely due to the production of {+244}Es from the p2n evaporation channel and hence only an upper limit for the |e branching was deduced. 
T$From 2008Kh10 from a total of 1700 SF decay events. Others (from heavy ion induced reactions): 3.47 ms {I26} (2012Sv02), 4.3 ms {I+45-16} (1989Il02), 3.0 ms {I5} (1979Ga06), 4.0 ms {I5} (1975Og02), 3.3 ms {I5} (1967Nu01) 
$Q{-|a}<8.6 MeV (2008Kh10) 


level_energy_unit: KEV
level_spin_parity: (1/2+)
level_lifetime_unit: S
level_comment:
J$(1/2+) based on systematics of N=145 isotones ({+239}Pu, {+241}Cm, {+243}Cf); 1/2+[631] calculated with the two-center shell model (TCSM) code (2010Ad19), and the cranked shell model (CSM) code with pairing correlations treated by a particle-number conserving (PNC) method (2012Zh01) 
$%|a |? 100 (2020Kh10) 
$%|e+|b{+} from correlations of the {+249}No alpha activity with subsequent alpha decays of energy 7728(20) keV and T{-1/2}= 1.2 m {I+10-4} measured by 2022Te01 which corresponds to the |a decay of {+245}Es. Other: %|e < 7 based number of observed {+245}Es (2020Kh10), 
$%SF < 0.3 based on number of observed fission and |a events (2020Kh10). 
T$Weighted average of 5.5 s {I7} from time distribution (2022Te01), 7.7 s {I+53-23} from Er-|a-|a(t) (2022Lo03) and 4.2 s {I13} from |a decay curve (1967Nu01). See also T{-1/2}=5.4 s {I8} from 2021Sv02 (superseded and same group as 2022Te01) 
$T{-1/2}(SF)>1.1 h, estimated from excitation function systematics (2000Ho27). 
$Configuration=1/2+[631] 


level_energy_unit: KEV
level_spin_parity: 0+
level_lifetime_unit: S
level_comment:
T$From weighted average of 1.50 s {I+8-7} (time distribution between implanted recoil nuclei and fission-fragments: 2022Is05), 1.6 s {I2} (|a(recoil) correlated decay curve: 2012Pi05), 1.54 s {I4} (time distribution between implanted nuclei and |a particles 2011Ve03) in ({+40}Ar,2n|g) 
%A,%EC+%B+$From 2011Ve03 
%SF$From weighted average of 6.1 % {I5}(2022Is05), 6.8 % {I6} (2011Ve03), 5 % {I3} (2010Sv01) 


level_energy_unit: KEV
level_spin_parity: 0+
level_lifetime_unit: S
level_comment:
T$From weighted average of 1.50 s {I+8-7} (time distribution between implanted recoil nuclei and fission-fragments: 2022Is05), 1.6 s {I2} (|a(recoil) correlated decay curve: 2012Pi05), 1.54 s {I4} (time distribution between implanted nuclei and |a particles 2011Ve03). 
%A,%EC+%B+$From 2011Ve03 
%SF$From weighted average of 6.1 % {I5}(2022Is05), 6.8 % {I6} (2011Ve03), 5 % {I3} (2010Sv01) 
$E|a: 8244 keV {I7} (2012Pi05), 8243 keV {I5} (2011Ve03), 8240 keV {I20} (2010An08). 


level_energy_unit: KEV
level_spin_parity: (7/2+)
level_lifetime_unit: S
level_comment:
T$From 2006He27. Others: 57 s {I+30-17} (2009Fo02), 29 s {I1} (2004He28), 37 s {I+21-10} (1989He03), 35 s {I4} (1967Fl15) 
J$From favoured alpha transition (HF|?0.68) from g.s level in {+251}No and proposed configuration=7/2[624] (2006He27,2004He28) 


level_energy_unit: KEV
level_spin_parity: (1/2+)
level_lifetime_unit: S
level_lifetime_info: ;ISO=M
level_comment:
J$From favoured alpha transition (HF|?1.1) from 106-keV level in {+251}No and proposed configuration=1/2[631] (2006He27,2004He28) 
T$From 2006He27. Other: 4.3 s {I4} (2004He28) 
E$From 2006He27 based on the mean value derived from the |a energy in the |aK x-ray measurement and the difference in measured Q(|a) values for decays from g.s. to g.s and g.s to isomeric states. 


level_energy_unit: KEV
level_spin_parity: (7/2+)
level_lifetime_unit: S
level_comment:
T$From 2006He27. Others: 57 s {I+30-17} (2009Fo02), 29 s {I1} (2004He28), 37 s {I+21-10} (1989He03), 35 s {I4} (1967Fl15) 
$Proposed configuration=7/2[624] (2006He27,2004He28) 


level_energy_unit: KEV
level_spin_parity: (1/2+)
level_lifetime_unit: S
level_lifetime_info: ;ISO=M
level_comment:
T$From 2006He27. Other: 4.3 s {I4} (2004He28) 
E$From 2006He27 based on the mean value derived from the |a energy in the |aK x-ray measurement and the difference in measured Q(|a) values for decays from g.s. to g.s and g.s to isomeric states. Other: |?29 keV (2004He28) 
$Proposed configuration=1/2[631] (2006He27,2004He28). 


level_energy_unit: KEV
level_spin_parity: (1/2+)
level_lifetime_unit: S
level_lifetime_info: ;ISO=M
level_comment:
E$From 2006He27 based on the mean value derived from the |a energy in the |aK x-ray measurement and the difference in measured Q(|a) values for decays from g.s. to g.s and g.s to isomeric states. 
T$From 2006He27. Other: 4.3 s {I4} (2004He28) 
$Proposed configuration=1/2[631] (2006He27,2004He28) 


level_energy_unit: KEV
level_spin_parity: 0+
level_lifetime_unit: S
level_comment:
%A$from 100-%|e. 1993An10 measured %|a=93 {I17} 
%SF$from T{-1/2}(SF)=10 h {I5} (1967Nu01) 
%EC$from the assumption that log| {Ift}>6 for any |e branch, one has %|e varying from <0.7% for decay to the expected 0+ level at or near the g.s., to <0.08 for decay to states at or near 1000 keV. The evaluator adopts a conservative upper limit of 10% for the total |e feeding (%|b{++} will be negligible) 
T$weighted average of 32.3 s {I15} from 2010KeZY in {+202}Hg({+48}Ca,2n|g) and 35.1 s {I8} from 2011Ga19 in {+252}No |a decay 
T$from {+202}Hg({+48}Ca,2n|g). Others: 24 s {I7} (1973Es01), 32 s {I6} (1970Dr05), and 36 s {I4} (1966Ak01). T{-1/2}(SF)=10 h {I6} (1967Nu01). Recommended by 2000Ho27. Other: |?60 h (1970Dr05) 


level_energy_unit: KEV
level_energy_info: ;ERR=GT;ERR=?
level_lifetime_unit: MS
level_lifetime_info: ;ISO=M
level_uncertain: ?
level_comment:
E,J$see {+202}Hg({+48}Ca,2n|g) for a discussion of the energy and possible configuration assignment for this isomer 


level_energy_unit: KEV
level_energy_info: ;ERR=GT;ERR=?
level_lifetime_unit: MS
level_uncertain: ?
level_comment:
E$the 904|g which follows decay of the 10.1-ms isomer, is in coincidence with electrons with energy up to |?170 keV 
J$no definitive configuration assignment can be made. See 2010KeZY for a discussion of several possibilities 


level_energy_unit: KEV
level_uncertain: ?
level_comment:
E$Calculated by the evaluator from E|a in 1997He29. May consist of unresolved doublet as observed by 1997He29 


level_energy_unit: KEV
level_spin_parity: (7/2+)
level_lifetime_unit: MIN
level_comment:
J$Analogy with other N=149 nuclei ({+243}Pu, {+245}Cm, {+247}Cf). Configuration=7/2[624] (2012He09) 
T$Weighted average from 1.95 min {I25} (2006Ni09) and 2.6 min {I7} (1966Ak01). Other: 2.5 min (1959Pe27) 
%A$From the number of recorded |a's in {+253}No and {+249}Fm (2012He09). Other: 32.7 {I85} (1993An10) 


level_energy_unit: KEV
level_spin_parity: (9/2-)
level_comment:
J$E1 150.6|g to (11/2+) 129.2-keV level, E1 221.7|g to (9/2+) 58.20-keV level and configuration=9/2[734] (2012He09) 
$Configuration=9/2[734] (2012He09) 


level_energy_unit: KEV
level_spin_parity: 0+
level_lifetime_unit: MIN
level_comment:
T 30 min {I3} was measured by 1957Am47 and 1966Ak01. Other measurements: |?30 min (1954At35,1957Am47), |?33 min (1962Do11). 
No |e decay activity was observed: |e/|a<0.1 (1957Am47). 
%SF=0.0069 {I10}, T{-1/2}(SF)=0.83 y {I15} (1989La07). Other measurement: %SF|?0.0006 (1970Dr05). 


level_energy_unit: KEV
level_energy_info: ;OFF=X
level_lifetime_unit: S
level_lifetime_info: ;ISO=M1
level_comment:
T measured by 1973Gh03. 
Assignment: {+249}Cf(|a,3n), parent of 30-min {+250}Fm; {+242}Pu({+12}C,X), {+243}Am({+11}B,X) and {+249}Cf({+4}He,x) cross-bombardment technique; not produced in {+243}Am({+12}C) and in {+243}Am({+13}C) reactions (1973Gh03). 
IT-decay mode is inferred by 1971Gh03 from the observation of 7.44-MeV |a's of the 30-min {+250}Fm g.s. No |g transitions have been observed deexciting this state. 
No evidence for decays by |a emission or spontaneous fission were seen, and the upper limits for such decay modes were placed by 1973Gh03 to Be of the order of 20%. 
Spontaneous fission branch was searched by 1989La07, and no evidence for SF activity from the 1.8- s isomer was seen: T{-1/2}(SF; 1.8-s isomer)/T{-1/2}(SF; g.s.)|>0.1 was determined, which corresponds to T{-1/2}(SF isomer)|>0.07 y, %SF|<8.2|*10{+-5} (1989La07). 
Possible configurations, 8-,(n 7/2[624],n 9/2[734]) or 7-,(p 7/2[633],p 7/2[514]), were suggested by 1973Gh03 to explain the existence of this isomeric state. The authors pointed out the existence of low-lying high-spin isomers also in the A=170-190 region. 
E level energy is not measured. A J|p=7- isomer with half-life of 70 ns was observed in {+256}Fm at 1425.5 keV. Calculations by 1991So15 for {+250}Fm predict 7-,(p7/2[633],p7/2[514]) state at 1.7 MeV, and 8-,(n9/2[734],n7/2[624]) state at 0.8 MeV. See 1991So15 for other configurations with K=7, K=8, and their calculated level energies. 
Potential energy and partial half-lives for SF decay from the states with 8-,(n9/2[734],n7/2[624]) and the 7-,(p7/2[514],p7/2[633]) configurations were calculated by 1986Ba43; their calculations yielded T{-1/2}(SF)=1.82|*10{+5} y and 9.77|*10{+8} y for the 8- and 7- states, respectively, and T{-1/2}=85.1 y for the 0+ ground state, which is a factor of 100 larger than the measured value. 


level_energy_unit: KEV
level_energy_info: ;OFF=Y
level_comment:
Only the SF decay was observed. No other decay modes have been searched; the level was populated in |e decay of {+250}Md (1980Ga07). 
E the level is proposed as being in the second potential well. The level energy has not been determined. See 1980Ga07 for calculation and evaluation of the inner fission barrier. 


level_energy_unit: KEV
level_spin_parity: 0+
level_lifetime_unit: MIN
level_comment:
T$ from 2006Ba09: Phys Rev C 73, 024308 (2006), from time interval between the arrival of recoils and subsequent |a decay event 


level_energy_unit: KEV
level_energy_info: ;OFF=X
level_lifetime_unit: S
level_lifetime_info: ;ISO=M
level_comment:
T$ from 2007Gr17, timing of conversion electrons 
E$ Possibly K|p=8- isomer in {+250}Fm with configuration= |n7/2[624]~#|n9/2[734]. Prominent |g rays from this isomer: 682, 835 and 870; weak |g rays: 47, 70, 82, 153, 789, 819 and 876. 


level_energy_unit: KEV
level_lifetime_unit: MIN
level_comment:
T$ measured by 2008Ga25 from 68 |a-decay chains of {+258}Db 
$ Decay modes from 'adopted levels' dataset for {+250}Fm in ENSDF database 


level_energy_unit: KEV
level_spin_parity: (9/2-)
level_lifetime_unit: H
level_comment:
%A$From 1978Ah02, with the remaining decay mode being electron capture. Note that 1973Ah02 gives %|a=1.9 {I2}. The evaluator has assumed that the more recent value supersedes the former value from the same authors. 
T$From 1973Ah02. Others: |?7 h (1957Am47,1967Ch17). 
J$Favored |a decay to (9/2-) state in {+247}Cf (1973Ah02) 


level_energy_unit: KEV
level_spin_parity: (5/2+)
level_lifetime_unit: US
level_comment:
J$M2 |g to ground state allows either 5/2+ or 13/2+, but the latter is excluded due to non-existence of fast E1 decay to 11/2- level. 


level_energy_unit: KEV
level_spin_parity: (1/2+)
level_lifetime_unit: NS
level_comment:
J$Inferred by presence of E2 |g to (5/2+) state but lack of transitions to (7/2+) and (9/2+) states. 


level_energy_unit: KEV
level_spin_parity: (1/2+)
level_lifetime_unit: NS
level_lifetime_info: ;ERR=LT
level_comment:
J$M1 decays to (1/2+) and (3/2+) levels, combined with favored |a decay to this level from the 1/2+[620] configuration in {+255}No. 


level_energy_unit: KEV
level_spin_parity: (5/2+)
level_lifetime_unit: US
level_comment:
T$Weighted average of 21 |ms {I3} (2006He20), 21.1 |ms {I19} (2011As03), and 23.7 |ms {I11} (2018Re07). Other: 1971Di03 reports a lifetime of 15.2 |ms {23}. 


level_energy_unit: KEV
level_spin_parity: 0+
level_lifetime_unit: H
level_comment:
%A,%SF$the branching ratio was measured by counting |a and fission in a 2|p proportional counter (1984Ah02). 
T$measured by 1984Ah02. Other measurements: 22.7 h {I7} (1956Fr07), 23.0 h {I13} (1967Ch17). 
$T{-1/2}(SF)=115 y {I60}, measured by 1966Rg04, gives %SF=0.0025 {I13}. T{-1/2}(SF)=125 y {I8} was calculated from SF/|a=0.0023% {I2} (1984Ah02) and the total half-life of 25.39 h {I4} (1984Ah02). 


level_energy_unit: KEV
level_spin_parity: 2+
level_comment:
E$from E|a(to 0+)-E|a(to 2+)=41.5 {I13}, |a energy difference measured by M. Asai, JAEA-Review 2016-025, p9, uncertainty also reported in 2015As05. Other: 47 {I5} from E|a(to 0+)-E|a(to 2+)= 46 {I5} (1990Ho03). 1990Ho03 report |a energy difference of 45.9 {I12}, but then state the 1 |s error is 5 keV due to interfering activities near the low intensity alpha. 


level_energy_unit: KEV
level_energy_info: ;OFF=X;ERR=?
level_spin_parity: 11/2-
level_lifetime_unit: US
level_lifetime_info: ;ISO=M
level_comment:
T$ obtained by fitting the (ce)|g coin decay curve by an exponential function (2011An13). Other: 0.5 |ms {I3} (2010St14) 
J$Configuration=|n11/2[725] from syst of N=153 (2010St14) 


level_energy_unit: KEV
level_spin_parity: 3/2+
level_comment:
J$favored |a decay from 3/2[622] state, same configuration assigned to 124 level in {+253}Fm 
$The band assignment is tentative. 


level_energy_unit: KEV
level_spin_parity: 0+
level_lifetime_unit: H
level_comment:
$%|a/%SF=1689 {I8}, weighted average of 1695 {I8} and 1664 {I17}, measured by 1967Fi03. Other measurements: 1956Jo09. 
T$measurement by 1967Fi03. Earlier measurements: 3.24 h {I1} (1956Jo09), 3.2 h (1954Ch23) 


level_energy_unit: KEV
level_spin_parity: 3+
level_comment:
J$584.18|g and 688.68|g, E2(+M1) to 4+ and 2+, respectively; |b feeding from 2+ parent rules out 4+, and 2+ is less likely from absence of |g to 0+; gamma-vibrational band member 


level_energy_unit: KEV
level_spin_parity: 7/2+
level_lifetime_unit: H
level_comment:
MOMM1 Resonance Ionization Spectroscopy (2005Bb14) 
MOME2 Resonance Ionization Spectroscopy (2005Bb14) 
J Favored |a decay to 7/2[613] band in {+251}Cf. See 1995Ci09, 1995Du05 for calculations of g.s. configuration. 
T from 1964As01; other measurements: 21.5 h {I1} (1956Jo09), 19.9 h {I3} (1963Ph01) 
%SF from SF/|a=2.4|*10{+-7} {I+11-9} (1963Ph01,2000Ho27). 


level_energy_unit: KEV
level_spin_parity: (9/2+)
level_comment:
E from A=6.723 keV {I16} and B=-0.0014 keV {I3} (parameters of the 7/2[613] band in {+251}Cf) one obtains E(9/2+)=60.0 {I5} 


level_energy_unit: KEV
level_spin_parity: 0+
level_lifetime_unit: MIN
level_comment:
T$weighted average of 150 min {I4} (1981Lo15), 157.6 min {I13} (1972Fl04), 157 min {I2} (1968Ho13), 162 min {I6} (1965Si14), 160 min {I10} (1958Ph40). Other: |?3-4 h (1955Ch30) 
$Branching: |a/(|a+SF)=0.081 {I3} was determined by 1968Ho13 from |a and SF counts. Other measurement: SF/|a=35 {I10} (1965Si14). 
$Emission of |a rays, tritons and protons in the SF of {+256}Fm was studied by 1985Wi10. 


level_energy_unit: KEV
level_spin_parity: (2-)
level_comment:
J |g transitions to the (2+),(3+) states of K=2 |g-vibrational band, and |g to only 2+ of the K=0 g.s. band; no |g rays to 0+,4+ of the K=0 g.s. band. 


level_energy_unit: KEV
level_spin_parity: (3+)
level_comment:
J |g transitions to 2+, (2-) and 4+ state rule out J<2, 2-, J>3 for 1099.7 level; 218.1|g to (2-) might be E1, as deduced from intensity balance at the 882.8 level in 7.6-h {+256}Es |b{+-} decay. The probable J|p values, then, are 2+ and 3+. From the branching ratios of deexciting gammas, 1989Ha10 suggested J|p=3+ which is consistent with absence of |g to the 0+ g.s. 


level_energy_unit: KEV
level_spin_parity: (5+)
level_comment:
J |g transitions to (3+) and (4+) states of K=2 band, but no |g to 2+ bandhead imply J|p of 5+ for the 1251.6 level. 


level_energy_unit: KEV
level_spin_parity: (7-)
level_lifetime_unit: NS
level_lifetime_info: ;ISO=M
level_comment:
T$from 1989Ha10 by (|b)(231|g)(t) data. The observed |b-delayed fission activities were consistent with this half-life. 
$The partial half-life for fission was deduced by 1989Ha10 as 0.8 ms {I+88-7} from the |b-delayed-fission probability of 2|*10{+-5} (measured number of delayed fissions/total number of |b{+-} decays of 7.6-h {+256}Es; two fission events were observed.) 
J |g transitions to 8+ and (5-) states, relative photon intensities of deexciting |g rays, and nonobservation of transitions to 5+, 4+ states suggest J|p=(7-). 1989Ha10 pointed out that this level could be analogous to the 7-,two-quasiparticle state predicted for {+254}Fm by 1964So02: K|p=7-, |p7/2[633]~#|p7/2[514]. 


level_energy_unit: KEV
level_spin_parity: (7+,8+)
level_comment:
J log| {Ift} for the |b branch from 7.6-h {+256}Es indicates an allowed transition, if completion of the decay scheme would not decrease |b intensity considerably. If J|p(7.6-h {+256}Es parent)=8+, then |p(1560 level)=+. From |g transition to the (7-) state, J|p=7+ or 8+ may be deduced. Because of the assumptions made, however, these suggested spins should be considered as very tentative. 


level_energy_unit: KEV
level_spin_parity: (5+)
level_comment:
J |g transitions to (3+), (4+) and probably to (5+) states; 1989Ha10 suggested that the 1328.4- and 1251.8-keV levels are members of a band, as indicated by their energy differences. 


level_energy_unit: KEV
level_spin_parity: (7-)
level_lifetime_unit: NS
level_lifetime_info: ;ISO=M
level_comment:
$K|p=(7-) 
T$determined by 1989Ha10 from (231|g)|b(t) measurements. 
$If |p(1560 level)=+ and 134.7|g is E1, then |p(1425.5 level)=-. The corresponding log| {Ift} of 5.2 (for I|b=86%) is quite low for a first-forbidden |b decay from 8+ parent. 
$If 134.7|g is M1/E2, the log| {Ift} values would be consistent. 


level_energy_unit: KEV
level_spin_parity: (7+,8+)
level_comment:
J$from probable allowed character of the |b transition to the 1559.9-keV level from the (8+) parent state, and |g to (7-) 


level_energy_unit: KEV
level_spin_parity: (9/2+)
level_lifetime_unit: D
level_comment:
J from favored |a HF to (9/2+) in {+253}Cf, configuration=(|n 9/2[615]) 
T from 1973Wi03. Others: 85 d {I25} (1967As02), 94 d {I10} (1966Rg01), 80 d {I5} (1965Si14), 79 d {I8} (1964Hu02) 
%SF$From |a/SF=475 {i10} (1973Wi03,2000Ho27); others: 1967As02, 1966Rg01, 1964Hu02, 1965Si14. Nucleus is |b{+-}, |e stable. 


level_energy_unit: KEV
level_spin_parity: 0+
level_lifetime_unit: US
level_comment:
$Only SF decay has been observed. The |b decay mode is forbidden 
T$average value of 370 |ms {I43} at 3|s is recommended by 1986Hu05 from their two measurements: 380 |ms {I60} (1971Hu03, with 3|s uncertainty) and 360 |ms {I20} (1986Hu05). 
$Theoretical partial half-lives for |a decay predict very small |a branch: T{-1/2}(|a)=12.9 y (1997Mo25), 86 d (1997Po18) 


level_energy_unit: KEV
level_lifetime_unit: S
level_comment:
T from 2000Ho27. Other values: 1.5 s {I3} (1980Hu03), 1.6 s {I1} (1985So03). 
%SF only SF observed (1980Hu03). 
%B- from Q(|b{+-})<430 and log| {Ift}>5.3 T{-1/2}(|b{+-})>1|*10{+4} s 
%A calculated T{-1/2}(|a)|?3|*10{+11} s (1997Mo25) 


level_energy_unit: KEV
level_lifetime_unit: S
level_comment:
$In 2020Po07, 100% |a decay mode is assumed, considering that possible {+244}Md |e decay would lead to fission events, either from |a-delayed fission or from the spontaneous fission of the {+244}Fm daughter ground state, whereas no such events were observed at the FIONA focal plane in the present experiment. In addition, measured half-life is in agreement with expected half-lives of 1.7 s {I+27-7} from Viola-Seaborg (VS) formula, 0.7 s {I+25-5} from Royer formula, and 1.0 s {I29-8} from the superfluid tunneling model (STM), favoring a dominant |a decay mode. From theoretical T{-1/2}=10.3 s for |b decay, and 1.15 s for |a decay (2019Mo01) also, dominant |a decay mode is expected. 
$From the similarity of |a1 and |a2 energies in events #4, #5 and #6, and agreement of E|a value for {+240}Es |a decay with literature value, these events are assigned to the decay of {+244}Md by 2020Po07. The first |a in event #3 is also assigned to {+244}Md decay. 
$In 2020Kh08, upper limit of %|e decay is estimated, from observation of no correlated fission events which could be assigned to {+244}Fm decay, as possible |e daughter of {+244}Md. 
$E|a=8794 {I20} (2020Kh08) from the decay of {+244}Md decay, as evaluator's unweighted average of seven |a1 values from seven EVR-|a correlated events with measured E|a=8810, 8860, 8810, 8780, 8730, 8830 and 8740 keV in 2020Kh08. From range of E|a=8730-8860 keV given by 2020Kh08, E|a=8795 {I65}. This |a transition populates the g.s. of {+240}Es 
E$it is assumed that the 0.38-s activity is associated with the ground state. This assumption is consistent with the results in 2020Kh08. In 2020Po07, however, authors have proposed the 0.4-s activity located above a very tentative lower state (possibly the g.s.) of |?6 s half-life, based on a single event. But no correlated event with 6-s activity is reported in 2020Kh08 
J$0+ or 7+ from |W{-|p}=7/2- and |W{-|n}=7/2- orbitals (2019Mo01) 
T$weighted average of 0.4 s {I+4-1} (2020Po07, average mean lifetime |Dt(EVR-|a{-1})=0.6 s {I+6-2}) and 0.30 s {I+19-9} (2020Kh08, based on eight mean lifetimes of correlated events, with values of 6.48 ms, 16.5 ms, 10.5 ms, 8.26 ms, 2.7 ms, 3.95 ms, 4.37 ms and 7.03 ms). It is assumed that the same activity is being observed in both the experiments. 
$Measured production |s=0.5 nb {I+3-2} for E({+40}Ar)=220 MeV beam (2020Po07) 
$Measured production |s=65 pb {I+34-25} for E({+50}Ti)=239.8 MeV beam (2020Kh08) 


level_energy_unit: KEV
level_energy_info: ;OFF=X
level_lifetime_unit: MS
level_lifetime_info: ;ISO=M
level_uncertain: ?
level_comment:
$The assignment of 5-ms activity, based on observed EVR-Fission correlated events (2020Kh08, listed in header comments) is very tentative. Several alternative scenarios have been provided by 2020Kh08 about these events, including assignment to {+244}Fm decay (known to decay by dominant SF mode with T{-1/2}=3.12 ms), and assignment to another activity (isomeric state) in {+244}Md which can decay by |e+|b{++} mode to {+244}Fm. No correlated events, corresponding to this activity, are reported in 2020Po07. 
$If the assignment of the 5-ms activity to {+244}Md in 2020Kh08 is correct, then only the SF decay mode has been observed. There is no experimental information about either |a decay or the |e+|b{++} decay. 
T$from 2020Kh08, based on eight mean lifetimes of correlated events, with values of 6.48 ms, 16.5 ms, 10.5 ms, 8.26 ms, 2.7 ms, 3.95 ms, 4.37 ms and 7.03 ms. 


level_energy_unit: KEV
level_spin_parity: (7/2-)
level_lifetime_unit: S
level_comment:
E$Assumed that the 0.33-s activity is associated with the ground state, in contrast with1996 
J$7/2-[514] from systematics of odd mass ({+247,249,251,253,255}Md) isotopes deduced from the decay studies of mendelevium isotopes using |a|g coincidence measurements in 2005He27. 7/2-[514] was also calculated for low-lying one-quasiproton states by 2010Ad19. In contrast 1996Ni09 assumed 1/2-[521] 
$Configuration=7/2-[514] 
$Only the |a decay has been observed in 1996Ni09 and 2020Kh08. Branching ratio deduced from theoretical calculations in 2019Mo01 with T{-1/2}(|b decay)=11.8 s, and T{-1/2}(|a)=0.56 s :%|a=95, %|e+|b{++}=5. 
T$From the correlation time distribution of |a events in 2020Kh08. Note that this half-life is similar to the 0.35 s {I+23-16} which was considered as an isomer in 1996Ni09. 


level_energy_unit: KEV
level_energy_info: ;OFF=X
level_spin_parity: (1/2-)
level_lifetime_unit: MS
level_lifetime_info: ;ISO=M
level_comment:
T$From Er-fission correlated decay chains (2020Kh08) J$ From 1/2-[521] (2017He08) 
$Configuration=1/2-[521] 


level_energy_unit: KEV
level_energy_info: ;OFF=X
level_lifetime_unit: S
level_lifetime_info: ;ISO=M1
level_comment:
T$From weighted average of 1.3 s {I4} and 0.8 s {I2} (2010An08). Others: 0.75 s {I18} and 1.3 s {I4} (2006An13), 1.0 s {I4} (1996Ni09,1994HoZW) 
$Spontaneous fission (SF) was observed decaying with T{-1/2}=1.0 s {I+10-3}. Part of this decay has been assigned to electron-capture delayed spontaneous fission (|e-SF) (2010An08). 


level_energy_unit: KEV
level_energy_info: ;OFF=Y
level_lifetime_unit: S
level_lifetime_info: ;ISO=M2
level_comment:
T$From 2010An08 
$Activity produced by {+209}Bi({+40}Ar,3n), E=198 MeV. Measured emitted alpha particles, |g rays of 252- and 279 keV (possibly E1 or E2) in coincidence with alpha particles; E|a=8178 keV {I10} (%I|a<23) (2010An08). 
$Possible electron-capture delayed spontaneous fission decay (%|e-SF>10) (2010An08). Other:1996Ni09 


level_energy_unit: KEV
level_energy_info: ;OFF=X
level_lifetime_unit: S
level_lifetime_info: ;ISO=M1
level_comment:
T$From 2010An08. Others: 0.75 s {I18} (2006An13), 1.0 s {I4} (1996Ni09),1.0 s {I4} (1994HoZW) 
$Spontaneous fission (SF) was observed decaying with T{-1/2}=1.0 s {I+10-3}. Part of this decay has been assigned to electron-capture delayed spontaneous fission (|e-SF) (2010An08). 


level_energy_unit: KEV
level_energy_info: ;OFF=Y
level_lifetime_unit: S
level_lifetime_info: ;ISO=M2
level_comment:
T$From 2010An08 
$ E|a=8178 keV {I10}, E|g=252.0- and 279.0-keV were observed following |a decay of {+246}Md(4.4 s) to {+242}Es. Possible |e delayed SF decay (%|eSF>10) from {+246}Md(4.4 s) (2010An08). Other: 1996Ni09 


level_energy_unit: KEV
level_spin_parity: (7/2-)
level_lifetime_unit: S
level_comment:
%SF$<1% in Fig. 4 in 2010An08. 
T$From evaporation residue 8416 |a(t) correlations in 2010An08. Note that there is some inconsistency in 2010An08, with T{-1/2}=1.2 s {I1} quoted in the text and Table 1, however, T{-1/2}=1.3 s {I1} is given in Fig. 2 and Fig. 4. Others: 2.9 s {I+17-12} (1981Mu12), 1.12 s {I22} (1994HoZW) 
J$From hindrance factor|?1 from {+247}Md |a decay to 209.6-keV level in {+243}Es and proposed configuration=7/2[514] (2010An08) 


level_energy_unit: KEV
level_energy_info: ;OFF=X
level_spin_parity: (1/2-)
level_lifetime_unit: S
level_lifetime_info: ;ISO=M
level_comment:
E$X<264 keV (2010An08) 
T$From a total of 24 counts of spontaneous fission events obtained in 2010An08. Note that there is some inconsistency in 2010An08, with T{-1/2}=0.25 s {I4} quoted in Table 1 and Fig. 4. however, T{-1/2}=0.24 s {I7} is given in the text. 
J$Proposed configuration=1/2[521] (2010An08) and from hindrance factor=2.5 from {+247}Md |a decay to (1/2-) level in {+243}Es 


level_energy_unit: KEV
level_lifetime_unit: S
level_comment:
%A$other: 58 {I20} (2008Ne01) 
T$from 1973Es01. Other: 13 s {I+15-4} (2008Ne01) 
$Probability of |e delayed fission was found by 1980Ga07 to be <0.05%. 


level_energy_unit: KEV
level_comment:
E$from |DQ(|a) with the assumption that the 9018|a feeds the g.s. The systematic component of E|a is 10 keV, added quadratically by the authors and subtracted out here to get the uncertainty in |DQ(|a) 


level_energy_unit: KEV
level_spin_parity: (7/2-)
level_lifetime_unit: S
level_comment:
%A$From counting of |a decays of {+249}Md and its |e/|b{++}-decay daughter {+249}Fm, with %|a({+249}Fm)=16 {I1} T{-1/2}({+249}Fm)=2.6 min {I7} (see Adopted levels for {+249}Fm). Others: From |a-|a correlations %|a>60 (1985He22) 
T$From weighted average of 26 s {I1} (2019Br06), 23 s {I3} (2009He20), 23.8 s {I+38-29} (2008Ga25), 19 s {I+3-2} (2001He35,2005KuZZ), 25 s {I+14-7} (1985He22), and 24 s {I4} (1973Es01). 
J$From 7/2-[514] configuration assigned in the {+253}Lr |a decay (2022Hu21,2009He20,2005KuZZ), systematics with neighboring Md odd isotopes; {+247}Md, {+251}Md, {+253}Md and quasiparticle-phonon model calculation (2013Sh45) 
$Configuration=7/2-[514] (2022Hu21) 


level_energy_unit: KEV
level_energy_info: ;OFF=X
level_spin_parity: (1/2-)
level_lifetime_unit: S
level_lifetime_info: ;ISO=M1
level_comment:
J$From 1/2-[521] configuration assigned in the {+253}Lr |a decay (2009He20,2005KuZZ), systematics with neighboring Md odd isotopes; {+247}Md, {+251}Md, {+253}Md and quasiparticle-phonon model calculation (2013Sh45) 
$Configuration=1/2-[521] (2022Hu21) 
T$From 2001He35 


level_energy_unit: KEV
level_spin_parity: (11/2-)
level_comment:
J$From similarity with the 8420-keV line in {+255}Lr depopulating the 7/2- level and feeding the 11/2- rotational state at |? 135 keV in {+251}Md (2006Ch52) 


level_energy_unit: KEV
level_energy_info: ;ERR=GE;ERR=?
level_spin_parity: (19/2-)
level_lifetime_unit: MS
level_lifetime_info: ;ISO=M2
level_comment:
T$From time distribution of recoil-electron correlation (2021Go26). 
J$From configuration 
$Configuration=|p7/2-[514]~#5/2+[622]~#7/2+[624] (2021Go26) 


level_energy_unit: KEV
level_spin_parity: (11/2-)
level_comment:
E$From 2022Hu21 
J$From similarity with the 8420-keV line in {+255}Lr depopulating the 7/2- level and feeding the 11/2- rotational state at |? 135 keV in {+251}Md (2006Ch52) 


level_energy_unit: KEV
level_spin_parity: (7/2-)
level_lifetime_unit: s
level_comment:
J$From Adopted Levels 
T$from recoil-|a(t) in 2019Br06 
%A$from counting of |a decays of {+249}Md and its |e/|b{++}-decay daughter {+249}Fm, and known %|a=15.6 {I10} for {+249}Fm |a decay from 2012He09, with correction for the fraction of {+249}Fm nuclide decaying during the search time of 600 s using T{-1/2}({+249}Fm)=2.6 min {I7} from Adopted Levels of {+249}Fm 
$Production cross section=300 nb {I80}(stat) at E(beam)=214.3 MeV {I11} without degrader, 70 nb {I40}(stat) at E(beam)=212.7 MeV {I11} with degrader (2019Br06), 300 nb at E(beam)|?219 MeV (2021Go26) 


level_energy_unit: KEV
level_energy_info: ;ERR=GE;ERR=?
level_spin_parity: (19/2-)
level_lifetime_unit: MS
level_lifetime_info: ;ISO=M
level_comment:
E$From 2021Go26 
T$From time distribution of recoil-electron correlation (2021Go26). 
J$From configuration 
$Configuration=|p7/2-[514]~#5/2+[622]~#7/2+[624] (2021Go26) 


level_energy_unit: KEV
level_lifetime_unit: S
level_comment:
T measurement by 1973Es01. Other measurement: 40 s {I+37-13} (1985He22). 
%|a and %|e are obtained from |e/(|a+|e)=0.94 {I3}, determined by 1973Es01 from comparison of {+250}Fm (|e daughter) |a counts and {+250}Md |a counts. Other measurement:%|a=13 {I10} (1985He22). 
|e-delayed fission was measured, and branching of 0.02 {I+2-1} per 100 |e decays was determined by 1980Ga07. 
Analogy to {+255}Md, {+257}Md ground states for the 101st proton orbital and analogy to {+245}Cm, {+247}Cf for the 149th neutron, the {+250}Md g.s. possibly has the 7-,(p 7/2[514],n 7/2[624]) configuration. 


level_energy_unit: KEV
level_lifetime_unit: S
level_comment:
T$ measured by 2008Ga25 from 68 |a-decay chains of {+258}Db 
$ Decay modes from 'adopted levels' dataset for {+250}Md in ENSDF database 


level_energy_unit: KEV
level_spin_parity: 7/2-
level_lifetime_unit: MIN
level_comment:
%A$From 2006Ch52. 
T$Weighted average of 4.28 min {I12} (2021Go26), 4.27 min {I26} (2006Ch52), and 4.0 min {I5} (1973Es01). 
J$Favored |a decay from the state assigned 7/2-[514] in {+255}Lr and the g-factor determined from the rotational band built on this state support the 7/2- assignment. 


level_energy_unit: KEV
level_spin_parity: 1/2-
level_comment:
J$Favored |a decay from the 1/2-[521] configuration in {+255}Lr and the lack of observed signature partner in the rotational band support the 1/2{+-} assignment. 


level_energy_unit: KEV
level_lifetime_unit: MIN
level_comment:
T$measured by 1973Es01; other measurement: T{-1/2}=8 min (1965Do09). 
$No |a decay from {+252}Md was observed by 1973Es01 and 1965Do09. The |a decay of {+252}Fm was observed by 1965Do09 and 1973Es01 following |e decay of {+252}Md. No upper limit was given for detection of any |a from {+252}Md g.s. was given. 
$The theoretical calculations of 2019Mo01 yield T{-1/2}(|a)=1|*10{+4.38} s which corresponds to %|a=0.58. Authors of 2019Mo01 calculate T{-1/2}(|b)>100 s for the partial-|b half-life for Gamow-Teller |b decay. 
J$possibly |n 9/2[734] + |p 7/2[514] orbitals coupled to 1+. 


level_energy_unit: KEV
level_spin_parity: (7/2-)
level_lifetime_unit: MIN
level_comment:
J$configuration=7/2[514] (2011An13) based on |e decay to {+253}Fm, log| {Ift}|?5.3 
%A |a decay of {+253}Md not observed following: Es(|a,xn) (1971Ho16); {+243}Am({+13}C,3n) ion chem (1992Ka08). 
T$6.45 min {I+11.6-3.6}, the disintegration constant determined from the growth of daughter, {+253}Fm (1992Ka08) 


level_energy_unit: KEV
level_energy_info: ;ERR=GE;ERR=?
level_comment:
$ Strong |g rays are observed at 394.2 and 453.5 keV, in coin with Md K x rays and conversion electrons between 40 to 400 keV. The two |g rays are not in mutual coincidence (2011An13) 


level_energy_unit: KEV
level_energy_info: ;ERR=GE;ERR=?
level_uncertain: ?
level_comment:
$ Strong |g rays are observed at 394.2 and 453.5 keV, in coin with Md K x rays and conversion electrons between 40 to 400 keV. The two |g rays are not in mutual coincidence 


level_energy_unit: KEV
level_lifetime_unit: MIN
level_comment:
E,J$based on model analysis by 2017So07, the 10-min activity is assigned configuration=|p1/2[521]~#|n1/2[620],K|p=0- and J|p=1-. 
$No |a decays associated with {+254}Md decay could be identified by 1970Fi12. The authors pointed out that {+254}Fm and {+256}Md isotopes were also present in the source, and any |a branches from {+254}Md would be indistinguishable since they would fall in the energy region of main |a branches from {+254}Fm and {+256}Md decays. 
T$measured by 1970Fi12 from the growth of {+254}Fm. The fermium fraction was milked immediately after the irradiation. 


level_energy_unit: KEV
level_energy_info: ;OFF=X
level_lifetime_unit: MIN
level_lifetime_info: ;ISO=M1
level_comment:
E,J$based on model analysis by 2017So07, the 28-min activity is assigned configuration=|p7/2[514]~#|n1/2[620],K|p=3- and J|p=3- within a few keV of the ground state 
T$determined by 1970Fi12 from relative abundances of {+254}Fm and {+255}Fm in successive milking following 1-hour irradiations and chemical purifications of recoil atoms. The half-life was derived relative to {+255}Md half-life; T{-1/2}({+255}Md)=27 min {I2} was measured by the authors. 
$No |a decay from this state could be identified (1970Fi12). 


level_energy_unit: KEV
level_spin_parity: (7/2-)
level_lifetime_unit: MIN
level_comment:
J Favored |a decay to (7/2-) level in {+251}Es. 
T 27 min {I2} (1970Fi12), 27 min {I3} (1971Ho16). Other: 1965Si14 
%A$%|a=8 {I2}, from growth of {+255}Fm daughter; |a/(|a+|e)=0.07 {I1} (1970Fi12), 0.100 {I14} (1971Ho16), 0.100 {I+25-17} (1965Si14) 
%EC$From K| x ray intensity and decay scheme (2000Ah02). 
SF looked for but not detected, %SF<0.15 (1971Ho16,2000Ho27). Calculated T{-1/2}(SF)|?5|*10{+7} min (1985Lo17). 


level_energy_unit: KEV
level_energy_info: ;ERR=SY;ERR=?
level_spin_parity: (1/2-)
level_comment:
E from {+259}Lr |a decay; estimated |DE=71 keV 
J favored |a decay from {+259}Lr indicates same configuration as parent; |a decay does not populate the g.s., which suggests a low J for this level, perhaps 1/2-. The Nilsson model suggests configuration=(|p 1/2[521]) for Z=103. 


level_energy_unit: KEV
level_spin_parity: (1-)
level_lifetime_unit: MIN
level_comment:
$(|a)/(|a+|e)=9.2% {I7} is adopted from 8.5% {I8}, determined by 1970Fi12 from K| x ray/|a intensities, and 9.9% {I5}, determined by 1971Ho16 from {+256}Fm growth. The latest value of 11% {I3}, obtained by 1993Mo18, is in agreement with the earlier values. %|a=9.2 {I7} is an unweighted average of earlier measurements. 2000Ah02 quote %|e=92, but the source reference is not given. 
$%SF<3 (1971Ho16). 
T$weighted average of 78.1 min {I18} (1993Mo18), 77 min {I5} (1971Ho16) 75 min {I4} (1970Fi12), 90 min {I12} (1965Si14). Other measurement: 90 min (1958Ph40) 
J$the |e decay to the 0+ {+256}Fm g.s. suggests low-spin, J=0,1 for the {+256}Md g.s. From the available states in the region, analogy to {+255}Fm suggests |n7/2[613] orbital for the odd-neutron state, and analogy to {+255}Md suggests |p7/2[514] orbital for the odd-proton state. From the Gallagher-Moszkowski rule, the J|p=0-, |p7/2[514], |n7/2[613] state is expected to be lower than the J|p=7-, |p7/2[514], |n7/2[613] state. The 7773-keV |a from {+256}Md g.s., on the other hand, is assumed to decay to the {+252}Es g.s. which probably has the J|p of 5- with |p3/2[521], |n7/2[613] configuration. Since an |a transition from J|p=0- to J|p=5- is forbidden, J|p({+256}Md g.s.)=1- of K=0 has been suggested. Inversion of 1- and 0- states has also been assigned for other K=0 bands (for example in {+242}Am g.s.). 
$J|p=1-, K=0 |p7/2[514], |n7/2[613] assignment for {+256}Md is consistent with an |a transition (HF=5.0|*10{+4}) to the J|p=5-, |p3/2[521], |n7/2[613] state, and with its |e decay to {+256}Fm. See 1993Mo18 for discussions on other possible orbitals. 


level_energy_unit: KEV
level_spin_parity: (7/2-)
level_lifetime_unit: H
level_comment:
J favored |a decay to (7/2-) level in {+253}Es suggests configuration=(|p 7/2[514]) 
T from 1993Mo18. Others: 5.0 h {I3} (1971Ho16), 5.4 h {I5} (1970Fi12) other: 3.0 h {I5} (1965Si14). 
$%|e from 1993Mo18, from ingrowth of {+257}Fm |a after mass separation. 
%A |a/(|e+|a)|<0.26 (1971Ho16), 0.10 {i3} (1970Fi12) 
%SF From T{-1/2}(SF)|>23 d (1993Mo18), recommended value (2000Ho27). Other values: T{-1/2}(SF)>6.1 d (1971Ho16); T{-1/2}(SF)>2.9 d (1965Si14). Calculated, T{-1/2}(SF); |?3|*10{+5} h (1985Lo17) 


level_energy_unit: KEV
level_spin_parity: (8-)
level_lifetime_unit: D
level_comment:
$%SF+%|e+%b{+-}|<0.003 (1993Mo18) 
$The upper limit on SF+|e+|b{+-} branching was determined by 1993Mo18 from the number of SF events detected. Other measurements: 1968Hu06, 1970Fi12. 
J$analogy to {+257}Fm and {+257}Md and Gallagher-Moszkowski rule suggests 8- with configuration=|p7/2[514] + |n9/2[615]. 
T$measured by 1993Mo18. Other measurements: 56 d {I7} (1970Fi12), 54 d {I5} (1968Hu06) 


level_energy_unit: KEV
level_energy_info: ;OFF=X
level_spin_parity: (1-)
level_lifetime_unit: MIN
level_lifetime_info: ;ISO=M1
level_comment:
$%SF+%b{+-}|<30 
$Decay branching ratios are from 1993Mo18. 
$The |e decay branching was obtained by 1993Mo18 from fermium K x-ray counts preceding SF events from {+258}Fm decay. The experimental K x-ray counts could not be corrected for summing of Fm K x-rays with any possible gammas from |e decay and with Fm L x-rays. 1993Mo18 set a lower limit of 70% for the |e decay branching by assuming that this decay populates only the g.s. band in {+258}Fm. 
$Origin of the observed SF events that were not correlated with the fermium K x-rays due to {+258}Md |e decay, could either be the 57.0-min {+258}Md or its |b{+-} decay daughter, {+258}No. Since these two possibilities could not be resolved, 1993Mo18 assigned the upper limit of 30% to the sum of SF and |b{+-} decay branches. 
$An upper limit of 1.2% for |a branch was given by 1993Mo18 from absence of any 57.0-min |a activity in their spectra. 
$Possibility of decay by an isomeric transition to the {+258}Md g.s. was also investigated, and an upper limit of 60% was obtained by 1993Mo18 for this decay mode by searching for growth of the particles from {+258}Md g.s. by assuming that the ground state was not directly produced during the production of the 57.0-min state in {+254}Es({+18}O,{+14}C) and {+254}Es({+22}Ne,{+18}O) reactions. 
J$Gallagher-Moszkowski rule suggests 1- with configuration=|p7/2[514] - |n9/2[615]. 1993Mo18 suggest also other K|p values with possible configurations: K|p=0- from |p7/2[514] - |n7/2[613] or |p3/2[521] - |n3/2[622], and K|p=2- from |p1/2[521] + |n3/2[622] 
T$measurement of 1993Mo18. Other measurements: 60 min {I2} (1986Hu05), 43 min {I4} (1980Ho04). 
$The isomer was produced by 1980Ho04 in {+255}Es(|a,n), and by 1993Mo18 in {+254}Es({+18}O,{+14}C) and {+254}Es({+22}Ne,{+18}O) reactions. 


level_energy_unit: KEV
level_lifetime_unit: H
level_comment:
T from 1993Mo18. Other: 1.72 h {I20} (1982Wi08). Other: 2000Ho27. 
J from calculations of 1994Cw02 the two low-lying Nilsson levels are 1/2[521] and 7/2[514]. {+259}Md is fed by {+259}No |e decay, but since the g.s. spin of {+259}No is not known and since it may not necessarily feed the g.s. of {+259}Md directly, it is not possible to choose between the options on the basis of experimental results. 
%SF number of SF events observed from initially pure {+259}No source is consistent with about 100% SF activity of its |e daughter (1982Wi08) 
%A from 1993Mo18. Other: %|a<3 (1982Wi08); no |a particles attributable to {+259}Md observed with 6.5 MeV<E|a<7.0 MeV (1993Mo18,1982Wi08). Calculated T{-1/2}(|a)=2.0 h (1997Mo25) 


level_energy_unit: KEV
level_lifetime_unit: D
level_comment:
T measured by 1986Lo16. 
$An upper limit of 25% |a branching was deduced by 1986Lo16 by fitting the fission distributions for mass 260 with a previously known distribution for {+256}Fm; an upper limit of 10% was deduced for |b{+-} decay from correlation counts for |b{+-} and SF events. Upper limits for K and L captures were obtained by 1989Hu09 as 10% each by time-correlation measurements of Fm x-rays with possible SF events from {+260}Fm, provided that T{-1/2}({+260}Fm)<100 ms. Inclusion of M+N+ shells yields %|e<23. 
$From their theoretical calculations 1997Mo25 obtained 9.1|*10{+4} d for the partial |a half-life of {+260}Md. 
$See 1994Mo31 for calculated |a, |b and spontaneous fission half-lives. See also 1989Mo03 


level_energy_unit: KEV
level_spin_parity: (5/2+)
level_lifetime_unit: MS
level_comment:
$Only the |a decay has been observed in 2021Sv02 and 2021Kh07. %SF decay mode in 2021Sv02 from Er-SF correlations, where only one such event with a decay time of more than 200 ms was observed, from which authors could set only an upper limit on the SF-decay branch. The |a decay of {+249}No is expected to be the dominant decay mode from theoretical T{-1/2}(|a)=1.18 s, and T{-1/2}(|e decay)=11.4 s (2019Mo01), suggesting |?90% |a and |?10% |e+|b{++} decay. 
$From the decay of {+249}No, measured E|a=9129 keV {I22} (2022Te01,2021Sv02); 9060 keV {I30} (2021Kh07). Weighted average is 9105 keV {I33}. 
T$from |a-decay in 2021Sv02 and 2022Te01, from detection of 218 events assigned to {+249}No from {+249}No |) {+245}Fm |a-|a correlated events, as shown in |a-spectrum in Fig. 1 of 2021Sv02 and Fig. 5 in 2022Te01 (T{-1/2}=43.8 ms {I7} in 2021Te08). Due to much higher statistics in 2021Sv02 and 2022Te01, as compared to those in 2021Kh07, as well as direct production of {+249}No isotope, evaluator recommends half-life measurement in 2021Sv02 and 2022Te01. Others: T{-1/2}=15 ms {I+74-7} ms (2021Kh07) from Er-{+253}Rf |) {+249}No |) {+245}Fm, Er-|a-|a-|a correlated events, with a total number of seven observed events; T{-1/2}=29 ms {I+14-7} from Er-|a-|a(t) (2022Lo03) 
J$(5/2+) assigned by 2022Te01 based on |n5/2[622] orbital for N=147 isotones {+239}U, {+241}Pu and {+243}Cm; 5/2+ also from theory in 2019Mo01, 2012Zh01, 2011Ad15, 2006Sh19, and 2005Pa73. Other: (7/2+) assigned by 2021Kh07 based on favored |a decay from {+253}Rf with |n7/2[624] orbital assignment, and based on g.s. J|p and similar configurations for {+247}Fm and {+251}No. However, 2022Lo03 assigned |n1/2[631] for the g.s. of {+253}Rf. 
$Measured production |s=0.47 nb {I4} in {+204}Pb({+48}Ca,2n),E=225.4 MeV (2022Te01), with 193 observed Er-|a correlated events. 


level_energy_unit: KEV
level_spin_parity: (1/2+)
level_comment:
E$deduced by evaluator from measured E|a=9310 {I20} and 9210 {I20} (2022Lo03). Other: |?125 keV (2022Te01) using E|a=9170 {I30} 


level_energy_unit: KEV
level_spin_parity: (1/2+)
level_lifetime_unit: MS
level_comment:
T$From time distribution measurement in 2022Te01 Note T{-1/2}= 38.3 ms {I28} from |t=55 ms {I4} given in 2022Te01 should be 38.1 ms {I28}. See also same group (2021Sv02) with T{-1/2}=38.1 ms {I25}. 
J$From 2022Te01. Other: (7/2+) (2021Kh07) 
$Configuration=5/2+[622] 
$Cross section for the production of {+249}No at E{+48}Ca=237 MeV was 0.47 nb {I4} with 193 Er-|a correlation events that were observed (2022Te01) 


level_energy_unit: KEV
level_spin_parity: 0+
level_lifetime_unit: US
level_comment:
$%|a<1.8 or 2.1 (2006Pe17), %|a<10 (2003Be18) 
T$average of 3.7 |ms {I+11-8} (2006Pe17) and 5.6 |ms {I+9-7} (2003Be18). Other: 6 |ms {I1} (2003Po08, same group as 2003Be18) 
$ |a decay branching is estimated by the evaluator to be 0.11% by requiring HF(|a g.s. to g.s.)=1.0 and r{-0}({+246}Fm)=1.483, extrapolated from the r{-0} systematics given in 1998Ak04. E|a(g.s. to g.s.)=8807 (calculated from Q(|a)=8850) and I|a(8807|a)=80% {I5} per 100 |a decays are used in calculations. 
$ Theoretical calculations of 1997Mo25 gives T{-1/2}(|a)=0.478 s, T{-1/2}(|b{++})=21.12 s, corresponding to %|a=0.052 and %|e+%|b{++}=0.0012. Both these half-lives suggest negligible decays through |a and |e modes in view of 4.2 |ms measured isotopic half-life 
$ Calculations of half-life for SF decay: 2005Xu01, 1997Po18, 1992Bh03, 1989St20, 1983Bo15, 1978Po09. 
$ Calculations of half-life for |a decay: 2005Ro01, 2005Zh24 1992Bh03, 1989St20, 1983Bo15, 1978Po09. 


level_energy_unit: KEV
level_energy_info: ;ERR=CA;ERR=?
level_spin_parity: (6+)
level_lifetime_unit: US
level_lifetime_info: ;ISO=M
level_comment:
$%|a<4.4 or 3.4 (2006Pe17), %|a<20 (2003Be18) 
E,J$ calculated value (2006Pe17) from multi-quasiparticle blocking calculations, possible configuration=|n5/2[622]~#|n7/2[624], K|p=6+ 
T$average of 43 |ms {I+22-15} (2006Pe17) and 54 |ms {I+14-9} (2003Be18). Others: 54 |ms {I+15-10} (2003Po08,same group as 2003Be18), 36 |ms {I+11-6} (2001Og08). 2003Be18 and 2003Po08 assigned the longer-lived activity to {+249}No, but 2006Pe17 assign this activity to {+250}No isomer 


level_energy_unit: KEV
level_energy_info: ;OFF=X
level_lifetime_unit: US
level_comment:
T$from Er-ce(t) and requiring correlation with a SF event (2020Ka02) 
E$longer-lived component is unambiguously assigned to the isomer based on the observation of Er-ce and Er-ce-SF events exhibiting similar time distributions (2020Ka02) 
%IT$lower limit deduced by 2020Ka02 
J$2020Ka02 proposed K|p=6+ state with two quasi-neutron configuration (5/2+[622])(7/2+[624]). 


level_energy_unit: KEV
level_lifetime_unit: US
level_comment:
T$from Er-SF(t) with 652 events excluding conversion electrons (2022Kh08). Other: 4.0 |ms {I4} from 126 Er-ce-SF(t) events (2022Kh08). 


level_energy_unit: KEV
level_energy_info: ;OFF=X
level_lifetime_unit: US
level_comment:
T$from Er-ce(t) with 126 events (2022Kh08). 
%SF$two Er-ST could be assigned to the isomer decay, which would give a SF branch of 1.5 % +20-5. However, these could not be unambiguously assigned to {+250m}No, thus 2022Kh08 report the branch as an upper limit. 


level_energy_unit: KEV
level_energy_info: ;OFF=Y
level_lifetime_unit: US
level_comment:
$proposed higher lying isomer based on observation of two events with Er-ce-ce-SF signals. These are attributed to a higher-lying K isomer that proceeds through the lower-lying K isomer state. 
$energy of second isomer is at least 300 keV higher than first isomer based on average energy of the two detected conversion electrons. 


level_energy_unit: KEV
level_spin_parity: (7/2+)
level_lifetime_unit: S
level_comment:
T$From 2006He27. Others: 0.8 s {I3} (1967Gh01), 1.0 s {I3} (1997He29), 0.76 s {I3} (2001He35), 0.78 s {I2} (2004He28), 0.78 s {I+38-22} (2009Fo02). 
%SF$Estimated by 2006He27 from detection of one fission event following |a decay of {+255}Rf. 
%A$From 2001He35. 
%EC+B+$One electron capture event has been observed (2009Fo02). 
J$Based on favored |a decay to (7/2{+-}) state in {+247}Fm (2006He27). 


level_energy_unit: KEV
level_spin_parity: (1/2+)
level_lifetime_unit: S
level_comment:
%A$Based on non-observation of |g rays from this state. 
E$From difference of Q(|a) values from decay from this state and the ground state into {+247}Fm. 
$J: Based on favored |a decay to (1/2-) state in {+247}Fm 
T$Weighted average 0.93 s {I6} (2004He28) and 1.02 s {I3} (2006He27). 


level_energy_unit: KEV
level_spin_parity: (7/2+)
level_uncertain: ?
level_comment:
J$Suggested in 2006He27 based on systematics in nearby nuclei. 
E$Two |g rays with energy 782.5 and 713.6 keV were observed in 2006He27, but the ordering could not be established. If the ordering is reversed, the excitation energy is 986.1 {I6}. 


level_energy_unit: KEV
level_energy_info: ;ERR=GE;ERR=?
level_lifetime_unit: US
level_lifetime_info: ;ERR=AP
level_uncertain: ?
level_comment:
E$2006He27 indicate that the 203.6, 713.6, and 782.5-keV transitions are in cascade, but it is not certain that there are no other unobserved transitions in the sequence, hence the lower limit on the level energy. 
T$From 2006He27. 


level_energy_unit: KEV
level_spin_parity: (7/2+)
level_lifetime_unit: S
level_comment:
T$From 2006He27. 
%SF$Estimated by 2006He27 from detection of one fission event following |a decay of {+255}Rf. 
%A$From 2001He35. 


level_energy_unit: KEV
level_spin_parity: (1/2+)
level_lifetime_unit: S
level_comment:
%A$Based on non-observation of |g rays from this state. 
T$Weighted average 0.93 s {I6} (2004He28) and 1.02 s {I3} (2006He27). 
E$From difference of Q(|a) values from decay from this state and the ground state into {+247}Fm. 


level_energy_unit: KEV
level_spin_parity: 0+
level_lifetime_unit: S
level_comment:
T$weighted average of 2.44 {I4} (2001Og08), 2.46 {I5} (2006Le29), 2.42 {I6} (2007Su19) and 2.47 {I2} (2011Ga19). Other measured values: 2.3 {I1} (2012Sv02), 2.43 {I13} (2012He01), 2.38 s {I+26-22} (2003Be18), 2.4 s {i3} (2002He01), 2.4 s {I3} (2001Ju05), 2.44 s {i12} (1994Wi17), 2.25 s {I+18-16} (1989La07), 2.30 s {i22} (1977Be09), 2.3 s (1976Fl13), 2.4 s {i2} (1970Og05), 4.5 s {i15} (1967Mi03), 2.3 s {i3} (1967Gh01). 
%SF$weighted average of 26.9 {I19} (1977Be09), 32.2 {I 5} (2001Og08), 32 {I3} (2003Be18), 29.3 {I9} (2011Ga19), 33.9 {I3} (2012Su22). Other results: 21.6 {I42} (1993An10), %SF/%|a=0.5 (1967Gh01), %|a/%SF=3.3 {I8} (2006Le29). The result %SF=29 {I 2} (2007Su19) was not included in the calculation: not clear from the publication whether the value is a new result by the authors. 
%EC+%B+$deduced from the measured %|a and %SF. Compatible with the limit (|e+|b{++})/|a<1.6% {I5} set by 2002He01. Other results: %|e+%|b{++}<10 (68% confidence level) estimated by 2001Og08. 
%A$from 2012Su22. Other results: %|a=71 {I3} (2007Su19), not included in the calculation (see %SF). 
$|d<r{+2}>{+254,252}=-0.105 fm{+2} {I7} (stat) {I7} (syst) (2018Ra11) 


level_energy_unit: KEV
level_spin_parity: 0+
level_lifetime_unit: S
level_comment:
T$from the adopted levels. 
%A,%SF$the results from 2007Su19 (%|a=71 {I 3}, %SF=29 {I2}) were not considered: not clear from the publication whether the value is a new result by the authors. 


level_energy_unit: KEV
level_spin_parity: (8-)
level_lifetime_unit: MS
level_lifetime_info: ;ISO=M
level_comment:
$Configuration=|n7/2[624]~#|n9/2[734] 
$Population is |? 50% of that for the ground state (2007Su19) 
T$calculated as the weighted average of 110 ms {I10} (2007Su19) and 109 ms {I6} (2008Ro21) 


level_energy_unit: KEV
level_spin_parity: (9/2-)
level_lifetime_unit: MIN
level_comment:
%A$other: %|a=47 {I8}, %|e+|b{++}=53 {I8} (2009Qi04) 
%A$only |a decay observed. 
%EC$from log| {Ift}|?6, T{-1/2}(|e)|?10 min 
J$from analogy with N=151 nuclei ({+245}Pu,{+247}Cm,{+249}Cf,{+251}Fm). Tentative configuration=9/2[734] (2004He23,2002He24,2002Bu04,2001Du02,2004He28) 
T$weighted average of 95 s {I10} (1967Mi03) and 105 s {I20} (1967Gh01,1971GhZV). 


level_energy_unit: KEV
level_spin_parity: 5/2+
level_lifetime_unit: US
level_lifetime_info: ;ISO=M1
level_comment:
T$from 2007Lo11. Other value: 31.3 |ms {I41} (2010St14). 
J$configuration=(|n 5/2[{-622]}) (2007Lo11) 


level_energy_unit: KEV
level_energy_info: ;OFF=X
level_spin_parity: (19/2+)
level_lifetime_unit: US
level_lifetime_info: ;ISO=M2
level_comment:
E LEVEL ENERGY HELD FIXED IN LEAST-SQUARES ADJUSTMENT 
T$ from (Er)(|a) correlated events and mult-component fitting procedure of the decay curve (2011Lo06). This half-life either may be from one isomer or a composite of two isomers, Other: 0.97 ms 21 (2007Lo11) 
J$ Possibly a high-K isomer with configuration= |p9/2[624]~#|p1/2[521]~#|n9/2[734] 


level_energy_unit: KEV
level_energy_info: ;OFF=Y
level_spin_parity: (25/2+)
level_uncertain: ?
level_comment:
E LEVEL ENERGY HELD FIXED IN LEAST-SQUARES ADJUSTMENT 
J$ Possibly a high-K isomer with configuration= |p9/2[624]~#|p7/2[514]~#|n9/2[734] 


level_energy_unit: KEV
level_spin_parity: 5/2+
level_lifetime_unit: US
level_lifetime_info: ;ISO=M1
level_comment:
E,J$ from 2007Lo11 
T$measured by 2007Lo11, 28 |ms {I3} (2009He23), 22.7 |ms {I5} (2011An13) 
$ Configuration=5/2[622] 
$ Population of the isomer in reaction=16% {I1} 


level_energy_unit: KEV
level_energy_info: ;OFF=X
level_lifetime_unit: MS
level_lifetime_info: ;ISO=M2
level_comment:
T$From 2007Lo11. Perhaps the same as 0.706 ms 24 isomer reported in 2011Lo06 No spectroscopic information is available due to problems in clean and efficient tagging on the decay of this isomer. 
$ Possibly a high-K isomer with configuration= K|p=25/2+, |p9/2[624]~#|p7/2[514]~#|n9/2[734] or K|p=23/2-, |n9/2[734]~#|n7/2[624]~#|n7/2[613] or K|p=21/2-, |n9/2[734]~#|n5/2[622]~#|n7/2[613] 


level_energy_unit: KEV
level_energy_info: ;OFF=X
level_spin_parity: (19/2+)
level_lifetime_unit: US
level_lifetime_info: ;ISO=M2
level_comment:
E LEVEL ENERGY HELD FIXED IN LEAST-SQUARES ADJUSTMENT 
T$ from (Er)(|a) correlated events and mult-component fitting procedure of the decay curve (2011Lo06). This half-life may be correspond to one isomer or a composit of two isomers, since half-life of 792 |ms {I43} is obtained from L-x rays and 209.5|g, whereas 641 |ms {I23} is obtained from other |g rays. 2011Lo06 measured T{-1/2}=0.706 ms {I24} from the time correlation between the implantation and the |a-decay of {+253}No g.s. for the new isomeric level(s). Authors stated that this T{-1/2} can be assigned either to J|p=(19/2+) at 0+x keV or J|p=(25/2+) at 0+y keV isomeric states but more data are needed to establish the complete level scheme, and to give a definite assignment 
$ Possibly a high-K isomer with configuration= |p9/2[624]~#|p1/2[521]~#|n9/2[734] 
E$ this isomer may correspond to either of the two states expected at 19/2+ and 25/2+. 


level_energy_unit: KEV
level_energy_info: ;OFF=Y
level_spin_parity: (25/2+)
level_comment:
E LEVEL ENERGY HELD FIXED IN LEAST-SQUARES ADJUSTMENT 
$ Possibly a high-K isomer with configuration= |p9/2[624]~#|p7/2[514]~#|n9/2[734] 


level_energy_unit: KEV
level_spin_parity: 5/2+
level_lifetime_unit: US
level_lifetime_info: ;ISO=M1
level_comment:
T$ based on exponential fit to the background-subtracted decay curve constructed from time differences between Er implantation and K x rays (2011An13) 


level_energy_unit: KEV
level_energy_info: ;OFF=X;ERR=?
level_lifetime_unit: US
level_lifetime_info: ;ISO=M2
level_comment:
E LEVEL ENERGY HELD FIXED IN LEAST-SQUARES ADJUSTMENT 
E$ lower limit established base on observed gamma ray transition energies and intensities, however an unambiguous decay scheme could not be established (2011An13) 
T$ from all observed events, however a value of 552 |ms {I15} is obtained for K x-rays in coincidence with ce and 650 |ms {I15} by only considering the highest |g transition peaks (802, 713, and 209 keV) (2011An13) 


level_energy_unit: KEV
level_energy_info: ;OFF=Y
level_uncertain: ?
level_comment:
E LEVEL ENERGY HELD FIXED IN LEAST-SQUARES ADJUSTMENT 
$ There may be another isomer to explain the observed transitions and a different half-life of 552 |ms obtained from decay curve for x rays 


level_energy_unit: KEV
level_spin_parity: (7/2-)
level_comment:
$Possible configuration=7/2[743] 
E$Level proposed by 2016He08 based on observation of two events (8296|a-556.7|g coincidence) which is probably fortuitous as 2016He08 note. Since the efficiency of the |g detector was only |?3% at 557 keV and at least about 60 |a decays would be needed to observe two coincidences. But only ten events were registered around 8300 keV. 
J$Proposed by 2016He08 based on |a-decay hindrance factor and 556.7|g to 5/2+ 


level_energy_unit: KEV
level_spin_parity: 9/2
level_comment:
$|d<r{+2}>{+254,253}=-0.070 fm{+2} {I2} (stat) {I5} (syst) (2018Ra11) 
J$from fit to hyperfine spectrum, J=7/2 and 9/2 are obtained (2018Ra11). Under assumption of prolate shape and considering sign of magnetic moment and |h2 of the fit, 2018Ra11 prefer 9/2 over 7/2. 
MOMM1$from hyperfine structure measurements (2018Ra11). Value is given as -0.527 {I33} (stat) {I75} (syst); compiler combines uncertainty in quadrature. 
MOME2$from hyperfine structure measurements (2018Ra11). Value is given as +5.9 {I14} (stat) {I9} (syst); compiler combines uncertainty in quadrature. 


level_energy_unit: KEV
level_spin_parity: 0+
level_lifetime_unit: S
level_comment:
$Measured |d|n({+254}No,{+253}No)=6.72 GHz {I18}; |d|n({+254}No,{+252}No)=10.08 GHz {I69}; |d<r{+2}>({+254}No,{+253}No)=-0.070 fm{+2} {I2}(stat) {I5}(syst); |d<r{+2}>({+254}No,{+252}No)=-0.105 fm{+2} {I7}(stat) {I7}(syst) (2018Ra11, laser atomic spectroscopy using radiation detected resonance ionization spectroscopy (RADRIS) technique at SHIP-UNILAC-GSI facility 
$Measured %|e=10 {I1}, %SF=0.23 {I10} (2010He10) from the number of |a decays and fission events from {+254}No and the number of |a decays from {+254}Fm. 
$Measured %|e=10 {I4}, %SF=0.25 {I+20-11} (1988Tu07) from |a and fission activities of {+254}No, and |a activities of {+254}Fm and {+246}Cf 
$Measured %SF=0.17 {I5} (1989La07) by comparing g.s. SF activity yield with |a activity yields for {+246}Cf and {+242}Cm; %SF=0.17 {I2} (1994Hu18) from the ratio of |a and SF events; %|a|?10 (1979Or02) 
T$from 2006He19, decay curve for 8.1-MeV |a peak. Others: 48 s {I3} (1999Le42), 53 s {I20} (1994Hu18), 54 s {I+8-6} (1989La07), 53 s {I+46-24} (1988Tu07), 68 s {I+36-18} (1985He22), 75 s {I15} (1967Mi03), 52 s {I5} (1967Gh01, value of 55 s {I5} measured relative to T{-1/2}({+214}Ra)=2.6 s was corrected by 1999Le42 for {+214}Ra half-life), 50 s {I10} (1966Do04). Weighted average of all the values is also 51.2 s {I4} with reduced |h{+2}=0.5 
T$T{-1/2}(SF)>25 h, estimated by 1966Fl04 


level_energy_unit: KEV
level_spin_parity: 2+
level_comment:
E LEVEL ENERGY HELD FIXED IN LEAST-SQUARES ADJUSTMENT 
E$from {+208}Pb({+48}Ca,2n|g), estimated by 1999Le42 from Harris parameters extracted for the g.s. rotational band. 


level_energy_unit: KEV
level_spin_parity: (8-)
level_lifetime_unit: MS
level_lifetime_info: ;ISO=M1
level_comment:
E$other: 1295 keV {I2} (2010He10), 1297 keV {I2} (2010Cl01) 
T$weighted average of 263 ms {I2} (2010Cl01, recoil-ce(t)); 275 ms {I7} (2010He10, recoil-ce(t)); 266 ms {I10} (2006Ta19, summed electron spectrum decay curve); 266 ms {I2} (2006He19, recoil-ce(t)). Other: 0.28 s {I4} (1973Gh03, first identification of the isomer) 
J$2010He10, 2006Ta19 and 2006He19 proposed |p9/2[624]~#|p7/2[514], K|p=8-. However, 2010He10 and 2006He19 suggested that long half-life of this isomer may be due to contribution from 2-neutron configurations of |n7/2[624]~#|n9/2[734] and |n7/2[613]~#|n9/2[734],K|p=8-. 2010Cl01 proposed |n7/2[613]~#|n9/2[734],K|p=8- configuration. 
$See 2015Ko14 evaluation for |g-transition hindrance factors 
$unobservedGammaIntensity=49 {I2}:From {+254}No IT decay (265 ms). 


level_energy_unit: KEV
level_energy_info: ;OFF=X;ERR=?
level_spin_parity: J1
level_comment:
E LEVEL ENERGY HELD FIXED IN LEAST-SQUARES ADJUSTMENT 
E$this level is the 1532.0, (10-) level in {+254}No IT decay (184 |ms):GSI (2010He10), but at 2013.2, (10+) in {+254}No IT decay (184 |ms):LBNL (2010Cl01) decaying through 481.8 and 605.2 |g rays. 2016WaZW did not confirm the existence of the 482|g, and the 605|g was placed from a 2917-keV level feeding the top member of the K=8 band. 2016WaZW suggested a possible placement of the 605|g directly from the isomer, but left open other possibilities. 
$J{-1}=10- in 2010He10, 10+ in 2010Cl01 


level_energy_unit: KEV
level_energy_info: ;OFF=Y;ERR=?
level_spin_parity: (16)
level_lifetime_unit: US
level_lifetime_info: ;ISO=M2
level_comment:
E LEVEL ENERGY HELD FIXED IN LEAST-SQUARES ADJUSTMENT 
$This isomer was defined at 3001 keV with an |?84-keV transition deexciting it in {+254}No IT decay (184 |ms):GSI (2010He10), and possibly at 2917 keV with direct deexcitation through the 605-keV |g ray by 2016WaZW. 2010Cl01 assigned it from 2928 keV with 312.4 and 133.4 gamma rays deexciting it in {+254}No IT decay (184 |ms):LBNL 
E$3001 keV {I3} (2010He10), 2917 keV (2016WaZW); 2928 keV {I3} (2010Cl01) 
T$weighted average of 184 |ms {I2} (2010Cl01, recoil-ce-ce(t)); 198 |ms {I13} (2010He10, recoil-ce(t)); 171 |ms {I9} (2006Ta19, summed electron decay curve) 
J$configuration=(|p7/2[514]~#|p9/2[624]){-8-}(|n7/2[613]~#|n9/2[734]) {-8-},K|p=16+ (2010Cl01). In 2010He10, |n7/2[613] orbital is replaced by |n7/2[624] 
$See 2015Ko14 evaluation for |g-transition hindrance factors, where the isomer is considered to deexcite directly through the 605|g 


level_energy_unit: KEV
level_spin_parity: 2+
level_comment:
E$from Adopted Levels. Other: 90 keV {I60} from E|a and Q(|a) values, which is likely to correspond to the first 2+ state in Adopted Levels 


level_energy_unit: KEV
level_spin_parity: (8-)
level_lifetime_unit: MS
level_lifetime_info: ;ISO=M
level_comment:
$|s(265-ms isomer)/|s for {+254}No channel=0.28 {I2} (2010He10) 
$1989La07 deduced %SF|<0.19 {I7} based on T{-1/2}(SF; isomer)|>150 s, deduced from measured T{-1/2}(SF; isomeric state)/T{-1/2}(SF; g.s.)|>0.005, assuming the isomeric ratio in their {+208}Pb({+48}Ca,2n) experiment was the same as [|s(isomeric state)/|s(g.s.)|?0.4] in {+246}Cm({+12}C,4n) reaction measured by 1973Gh03. 
$No SF decay was detected by 1988Tu07 from |?0.3-s isomer in {+254}No 
$No evidence was found by 1973Gh03 for |a or SF decay modes of this isomer, with an upper limit of 20%. 
E$from average of 1295 keV {I2} (2010He10) and 1297 {I2} (2010Cl01) 
T$from Adopted Levels 
$|n7/2[613]~#|n9/2[734],K|p=8- configuration proposed by 2010Cl01. 2010He10, 2006Ta19 and 2006He19 proposed |p9/2[624]~#|p7/2[514],K|p=8-, However, 2010He10 and 2006He19 suggested that long half-life of this isomer may be due to contribution from 2-neutron configurations of |n7/2[624]~#|n9/2[734] and |n7/2[613]~#|n9/2[734],K|p=8-. 


level_energy_unit: KEV
level_spin_parity: (8-)
level_lifetime_unit: MS
level_lifetime_info: ;ISO=M1
level_comment:
$%SF determined from number of observed fission events correlated to an evaporation residue within |Dt(Er-SF)|<1 s and the number of {+254}No nuclei produced in the isomeric state 
$Upper limit of %|a estimated from energy summing of |a-particles and conversion electrons from the first 2+ to g.s. transition, while considering that |a transition to the g.s., requiring |DL=8, is highly unlikely 
$|s(265-ms isomer)/|s for {+254}No=0.28 {I2} (2010He10) 
E$1295 keV {I2} (2010He10) 
T$from Adopted Levels. 2010He10 measured 275 ms {I7} from time distribution between the recoil implantations and the decay of the isomer through electron signals 
$Configuration=|p9/2[624]~#|p7/2[514], K|p=8-. But long half-life of this isomer may be due to contribution from 2-neutron configurations of K|p=8-: |n7/2[624]~#|n9/2[734] and |n7/2[613]~#|n9/2[734] 


level_energy_unit: KEV
level_lifetime_unit: US
level_lifetime_info: ;ISO=M2
level_comment:
$Upper limit of %SF estimated from non-observation of spontaneous fission events following the implantation of an evaporation residue within |Dt(Er-SF)<1 ms, and on the basis of the population intensity of the isomer. 
$|s(184-|ms isomer)/|s for {+254}No=0.04 {I1} (2010He10) 
$Based on the possible delayed character of the 605.7-keV transition, 2016WaZW proposed that the 184-|ms isomer decays directly through this transition, without going through an intermediate level, however, the statistics were weak, and this transition possibly mixed with a similar energy |g ray in the spectra resulting from {+74}Ge(n,n'|g). While negating several observations in 2010Cl01, 2016WaZW also suggested that there could be two 605-keV transitions in {+254}No, one delayed and the other prompt. 2016WaZW concluded with the following statement about the 605-keV transition: "The 605 keV rays seen at the focal plane in coincidence with the decay of the fast isomer confirm that there is a transition with this energy in {+254}No somewhere between the two isomers, but it does not give any more information about where in the level scheme the transition should be placed. Any of the level schemes in figure 9.1 is consistent with this observation". Further experiments, with better statistics, and perhaps better detector technology are needed to confirm the decay scheme of the 184-|ms isomer feeding the 265-ms isomer. 
T$from Adopted Levels. 2010He10 measured 198 |ms {I13} from time distribution between the recoil implantations and the decay of the isomer through electron signals 
E$all experimental evidences indicate that the 605.7|g is prompt, therefore, the K=(16) state cannot correspond to the 198 |ms isomeric state. The isomer is probably built on a state of lower K value. There is weak evidence that there is an 84-keV |g-ray from this level 
J$K|p=16+ with configuration=[(|p7/2[514]~#|p9/2[624]),K|p=8-] ~# [(|n7/2[624]~#|n9/2[734]),K|p=8-] 


level_energy_unit: KEV
level_spin_parity: (8-)
level_lifetime_unit: MS
level_lifetime_info: ;ISO=M1
level_comment:
E$1297 keV {I2} (2010Cl01) 
T$from Adopted Levels. 2010Cl01 measured 263 ms {I2} from recoil-ce(t) 
$Proposed configurations=|p9/2[624]~#|p7/2[514], K|p=8- (2010He10,2006Ta19,2006He19); |n7/2[613]~#|n9/2[734], K|p=8- (2010Cl01). However, 2010He10 and 2006He19 suggested that long half-life of this isomer may be due to contribution from 2-neutron configurations of |n7/2[624]~#|n9/2[734] and |n7/2[613]~#|n9/2[734], K|p=8-. 


level_energy_unit: KEV
level_spin_parity: (16+)
level_lifetime_unit: US
level_lifetime_info: ;ISO=M2
level_comment:
E$2928 keV {I3} (2010Cl01) 
T$from Adopted Levels. 2010Cl01 measured 184 |ms {I2} from recoil-ce(t) and recoil-ce-ce(t) 
$|p7/2[514]~#|p9/2[624]~#|n7/2[613]~#|n9/2[734], K{+|p}=16+ configuration is suggested by 2010Cl01 


level_energy_unit: KEV
level_spin_parity: 2+
level_comment:
E LEVEL ENERGY HELD FIXED IN LEAST-SQUARES ADJUSTMENT 
E$estimated by 1999Le42 from Harris parameters extracted for the g.s. rotational band. 


level_energy_unit: KEV
level_energy_info: ;ERR=AP;ERR=?
level_comment:
E$enhancement of gamma-ray intensity in the region between 1.7 and 3 MeV was observed by 2022Be24 and attributed to the scissors mode. 
$large negative asymmetry was observed for the 2.5 MeV peak indicating M1 character. 
$total B(M1)=11.8 |m{-N}{+2} {I19} was deduced for the 2.5 MeV peak (2022Be24) 


level_energy_unit: KEV
level_spin_parity: (1/2+)
level_lifetime_unit: MIN
level_comment:
J$From |a-decay hindrance factor systematics and analogy with N=153 nuclei ({+249}Cm, {+251}Cf) suggests g.s. configuration=(|n 1/2[620]). 
T Weighted average of 3.52 min {I32}, from |a fine structure measurement, and 3.52 min {I21}, from |a|g coincidence measurements (2011As03). Other values: 3.1 min {I3} (1967Gh01), 3.0 min {I2} (1968Fl08,1967Fl05), 3.3 min {I2} (1970Es02). Others: 2006Gr24, 2004Mo27, 2004Mo40. 
%A$From 2011As03. %|a=61 {I3} (1976SiZS) is based on %|e+%|b{++}=39 {I3} (1976SiZS), possibly affected by an impurity of {+254}No in their source. 
Calculated T{-1/2}(SF)|?3 min (1985Lo17) 


level_energy_unit: KEV
level_spin_parity: 11/2-
level_lifetime_unit: US
level_comment:
$configuration=|n11/2-[725] 
T$from ce-ce(t) in Exp 1 (2022Br08). Other 105 |ms {I18} from ce-ce(t) in Exp 2 (2022Br08). 
E$estimated by 2022Br08 from sum of ce as 240-300 keV. 


level_energy_unit: KEV
level_spin_parity: (15/2+,17/2+)
level_comment:
$the 741|g, 632|g, and 839|g are associated with the decay of this level, although exact placement has not been determined. 


level_energy_unit: KEV
level_energy_info: ;ERR=GE;ERR=?
level_lifetime_unit: US
level_comment:
J$estimated by 2022Br08 as greater than or equal to 19/2. 
T$from Er-355|g, 632|g, 741|g, and 839|g(t) (2022Br08). 
$the 355|g is associated with the depopulation of this level, although the exact placement has not been determined. 


level_energy_unit: KEV
level_spin_parity: (19/2,21/2,23/2)
level_lifetime_unit: US
level_comment:
T$from Er-ce(t) in Exp 1 (2022Br08). Other 76 |ms {I14} from Er-ce(t) in Exp 2 (2022Br08). 
$The 657|g is associated with the depopulation of this level, although exact placement has not been determined. 
E$based on 109|us isomer, uncertainty in energy is propagated to this level. 


level_energy_unit: KEV
level_spin_parity: 0+
level_lifetime_unit: S
level_comment:
$%|a({+256}No) is obtained from SF/|a=0.0053 {I+6-3}, measured by 1990Ho03. Any possible |e decay branch is taken as negligible: calculations of transition probability for an electron-capture branch from {+256}Md g.s. to the {+256}Fm g.s. yield I(|e)|<0.001% by requiring its log| {Ift} value to be |>5.8. 
$From calculation of r{-0} parameters as a function of |a branching, a probable |e branch can be estimated only with large uncertainty: the expected r{-0} value of 1.477 {I10} corresponds to %|a=100, with a lower limit of 75%. 
$Calculations by 1997Mo25 give T{-1/2}(|b{++})>100 s (with respect to Gamow-Teller |b decay) and T{-1/2}(|a)=2.75 s. 
$%SF was deduced by 1968Fl05 as |<0.25; %SF=0.25 was also obtained by 1967Gh01; however, isotopic assignment was uncertain. 
T$from measurement by 1990Ho03. Others: 3.3 s {I2} (1967Gh01), 3.7 s {I5} (1968Fl05), 6 s {I2} (1967Dr02), 8.2 s {I10} (1966Ku15), |?8 s (1964Do10,1963Do12). 


level_energy_unit: KEV
level_spin_parity: 0+
level_lifetime_unit: S
level_comment:
T$from time difference plot of position-correlated |a and ERs with gate on E|a=8400-8460 keV, as the measured E|a=8444 keV {I10} from 96 {I2} g.s. decays detected for {+256}No (2021Ke10). The half-life can be compared with 2.91 s {I5} from 1990Ho03 (Phys. Rev. C 41, 631), and adopted in the current ENSDF database. Corresponding E|a=8448 {I6} in 1990Ho03, and 8446 {I5} in 2016AsZX (JAEA-Review 2016-025, p.9). 


level_energy_unit: KEV
level_energy_info: ;OFF=X
level_lifetime_unit: US
level_lifetime_info: ;ISO=M
level_comment:
$13 |g rays, listed here as unplaced |g rays, could be connected with the decay of the isomer(s), as implied by the authors from |g-DSSD correlated events. 
E$x>1089 keV (2021Ke10), estimated from the summed energy of electrons and gamma rays in coincidence, listed in the last column of Table I. The isomer could be a composite of two isomers as described by the authors, based on half-life analysis of correlated events 
T$measured by 2021Ke10from 15 Er-ce-|a correlated events and using analyzed using low-statistics method of 1984Sc13 (Zeit. Phys. A316, 19). Authors mentioned that the distribution of 15 events in two blocks, six events corresponding to a lower half-life, and that of nine events (Fig. 5 in the paper) of higher half-life, possibly indicates two isomers with half-lives of <6 |ms for the faster six events in the first block, and 10.9 |ms {+217-43} for the slower set of nine events 
$From the 15 observed isomeric photons associated to the 753 {I36} implants of {+256}No nuclei in the DSSD, ratio of |?4% is deduced by the authors between the observed isomeric decays and ground state decays 
$2021Ke10 discuss various scenarios of two-quasineutron and two-quasiproton structures. Based on observed low yield of isomeric transitions, authors interpret possible 4-qp structure, as 2-qp configurations usually have 15-20% of the total isomeric decay flux. While no definite configuration is proposed, authors point out probable 2-quasineutron configurations of (|n11/2[725]~#|n1/2[620]), K|p=5- and (|n11/2[725]~#|n3/2[622]),K|p=7- 


level_energy_unit: KEV
level_spin_parity: (3/2+)
level_lifetime_unit: S
level_comment:
Only |a decay has been observed. %SF from T{-1/2}(SF)>28 min (2000Ho27,2000La34). %|e estimated in 2002Ho11. 
Calculated T{-1/2}(|a)|?200 s (1990Ha26) 
J Favored |a decay to 3/2+ {I3}/2[622] at 124 keV in {+253}Fm (2005As05). 
T From 2005As05. Other values: 24 s {I3} (2011Ha13), 26 s {I2} (1970Es02), 23 s {I2} (1967Gh01), 25 s {I3} (2000La34). 
Calculated T{-1/2}(SF)|?30 s (1985Lo17). 


level_energy_unit: KEV
level_energy_info: ;OFF=X
level_comment:
E x=239 {I36} from Q(|a)=8648 {I36} (systematics,2011AuZZ) and E|a; based on the assumption that the 70 s activity is the g.s. of {+261}Rf 


level_energy_unit: KEV
level_spin_parity: 0+
level_lifetime_unit: MS
level_comment:
T$measured by 1989Hu09. Earlier measurement: T{-1/2}|?1.2 ms (1969NuZZ) 
$Only the SF decay mode has been observed. Symmetric mass distribution was observed in SF, and total kinetic energy of fission fragments were measured by 1986Hu01 and 1989Hu09. 
$Theoretical partial |a half-lives, log T{-1/2}(|a)=-8.89 y (T{-1/2}(|a)=41 ms) (1976Ra02) and T{-1/2}(|a)=2.1 min (1997Po18), suggest %|a=3 and %|a=0.66, respectively. 


level_energy_unit: KEV
level_spin_parity: 0+
level_lifetime_unit: MS
level_comment:
$Decay mode from {+258}No Adopted Levels in the ENSDF database (Aug 2017 update) 
$2018Br13 reported observing 150 SF events at E({+48}Ca)=252,258 MeV, with a half-life of 1.24 ms {I+16-14}, and with a high-energy yield. Authors made possible assignment of these events to {+258}No, based on a comparison of measured yields of several other reaction products from transfer reactions in the present reaction with those measured in literature for reaction products in {+248}Cm({+48}Ca,X) reaction. 
T$measured by 2018Br13 from SF decay events. This value can be compared with 1.2 ms {I2} in {+258}No Adopted Levels in the ENSDF database. 
$Compiler's note: the assignment of {+258}No nuclide in the present work seems tentative, thus the reported half-life should be viewed with caution. 


level_energy_unit: KEV
level_spin_parity: (9/2+)
level_lifetime_unit: MIN
level_comment:
J from analogy with {+257}Fm (only N=157 nucleus with J|p assignment suggested by experimental results) configuration=(|n 9/2[615]). However, according to calculations in 1994Cw02 (see above), other assignments are possible. 
T from 1973Si40; other: 59 min {I13} (1982Wi08) 
%EC+%B+,%SF$from 1982Wi08 (from number of SF events ({+259}Md SF) per {+259}No decay). Estimate of %SF=1 {I9} from growth and decay curves (1982Wi08,2000Ho27). 
See 2008AsZY for |g rays emitted following |a decay of {+259}No. 


level_energy_unit: KEV
level_spin_parity: 0+
level_lifetime_unit: MS
level_uncertain: ?
level_comment:
T measured by 1985So03. T{-1/2}=73 ms {I24} was measured following production in {+254}Es({+18}O,X), and T{-1/2}|?100 ms in {+254}Es({+22}Ne,X) (1985So03). 
$See 1992Bh03, 1989St20, 1987Mo16, 1983Bo15, 1978Po09 for calculated fission half-lives. 
$Partial half-life for |a decay was calculated by 1997Po18. 


level_energy_unit: KEV
level_spin_parity: 0+
level_lifetime_unit: MS
level_lifetime_info: ;ERR=AP
level_comment:
Only SF decay was observed. 
T 5-ms fission activity was assigned by 1989HuZU to T{-1/2}({+262}No) from the time distribution between nobelium K| x ray's and subsequent fission. 
T{-1/2}(SF)|?5 ms is recommended by 2000Ho27 from measurements of R.W. Lougheed, et al, reported in Proc. 50 Years With Nuclear Fission Conf. Vol.II. 694 (1989). 
For calculated T{-1/2}(SF), see 1989Mo03, 1989St20 and 1992Bh03. For calculated T{-1/2}(|a), see 1997Mo25 and 1997Po18. The partial half-lives calculated by different methods do not agree; however, the relative partial half-lives, T{-1/2}(SF)/T{-1/2}(|a), predict the SF-decay branching of {+262}No to Be nearly 100%. 


level_energy_unit: KEV
level_lifetime_unit: S
level_comment:
%A,%EC+%B+,%SF$not measured for this nucleus. The probability for spontaneous fission of {+252}Lr was studied by 1976Og02 through {+203,205}Tl({+50}Ti,xn) reactions, and an upper limit of 2% was estimated for its spontaneous fission decay. The theoretical calculations of 2019Mo01 give T{-1/2}(|a)=5.50 s and the partial half-life for Gamow-Teller |b decay T{-1/2}(|b{++})=1.98 s, hence %|a |? 40, %|e+%|b{++} |? 60, %SF<2. 
T$weighted average of 0.27 s {I +18 -8} (2008Ne01) and 0.36 s {I +11 -7} (2001He35). 


level_energy_unit: KEV
level_lifetime_unit: S
level_comment:
T$weighted average of 0.27 s {I +18 -8} (2008Ne01) and 0.36 s {I +11 -7} (2001He35). 
%A,%EC+%B+,%SF$not measured for this nucleus. The probability for spontaneous fission of {+252}Lr was studied by 1976Og02 through {+203,205}Tl({+50}Ti,xn) reactions, and an upper limit of 2% was estimated for its spontaneous fission decay. The theoretical calculations of 2019Mo01 give T{-1/2}(|a)=5.50 s and the partial half-life for Gamow-Teller |b decay T{-1/2}(|b{++})=1.98 s, hence %|a |?40, %|e+%|b{++}|?60, %SF<2. 


level_energy_unit: KEV
level_spin_parity: (7/2-)
level_lifetime_unit: S
level_lifetime_info: ;ISO=M
level_comment:
%A$from %SF=1.3 {I+30-10} (2001He35). 
J$configuration=7/2-[514] (2001He35,2005KuZZ) T{-1/2}(SF)|>2.2 min (2000Ho27) 
T from 2001He35, 1999He11 


level_energy_unit: KEV
level_energy_info: ;OFF=Y
level_spin_parity: (1/2-)
level_lifetime_unit: S
level_lifetime_info: ;ISO=M1
level_comment:
%|a: from measured %SF=8 {I5} (2001He35) 
J$configuration=1/2-[521] (2005KuZZ) 
T from 2001He35. Others: 1.3 s {I+6-3} (1985He22,1986He28), 1.7 s {I+20-6} (1989Mu09), 1.5 s {I+3-2} (1999He11). 


level_energy_unit: KEV
level_energy_info: ;OFF=Y
level_spin_parity: (1/2-)
level_lifetime_unit: S
level_lifetime_info: ;ISO=M
level_comment:
J$configuration=1/2-[521] (2001He35,2005KuZZ) 
T from 2001He35. Others: 1.3 s {I+6-3} (1985He22,1986He28), 1.7 s {I+20-6} (1989Mu09), 1.5 s +3-2 (1999He11). 


level_energy_unit: KEV
level_lifetime_unit: S
level_comment:
$%|e+|b{++} decay mode was determined from a total number of 158 |a particles from the decay of {+254}No produced in |e decay of {+254}Lr, and a total number of 445 |a particles from the |a decay of {+254}Lr. Others: %|a=76 {I11}, %|e+%|b{++}=24 {I11} (1985He22, same group as 2008An16, note that value of %|e+%|b{++}=22 {I6} was modified to account for 90% |a decay for {+254}No); %|a=60 {I+11-15}, %|e+%|b{++}=40 {I+15-11} (2006Fo02); %|a=94 (1984Og03) 
$Upper limit for SF decay mode: see details in 2000Ho27 evaluation. 
T$from |a-decay curves. Weighted average of 18.4 s {I18} (2008An16 at GSI) and 17.8 s {I+19-16} (2008Ga25 at LBNL). Other less precise measurements with fewer number of correlated events: 22 s {I+9-6} (2006Fo02, from the same group as 2008Ga25); 13.4 s {I42} (2001Ga20 at HIRFL-Lanzhou); 10.0 s {I+45-24} (1989Mu09); 13 s {I+3-2} (1985He22, 1986He28); 10 s {I+7-5} (1981Mu06). 1989Mu09, 1986He28, 1985He22 and 1981Mu06 are from GSI, the same research group as 2008An16 
$Decay modes from 2008An16. 


level_energy_unit: KEV
level_energy_info: ;OFF=X
level_uncertain: ?
level_comment:
$From the decays of two |a-activities in {+258}Db, 2009He20 assumed two long-lived activities in {+254}Lr, but two separate half-lives for {+254}Lr could not be determined. 


level_energy_unit: KEV
level_spin_parity: [1/2-]
level_lifetime_unit: S
level_comment:
$%|a Deduced by evaluators from data in 2008Ha31. Other values: %|a=85 {I15}; %|e+%|b{++}<30; %SF<0.1, from 1971Es01. Upper limit deduced from comparison of possible {+255}No (|e daughter) |a's to {+255}Lr |a's. %SF from T{-1/2}(SF)>6 h (1976Og02,2000Ho27) and T{-1/2}=31.1 s. 
J Expected from theory (2002Lo05). Other: 2008KeZY. 
T Weighted average of 31 s {I2} (2008Ha31) and 31.1 s {I13} (2006Ch52). Other values: 22 s {i5} (1971Es01), 21.5 s {i50} (1976BeYM), and >19.1 s (2008An16), 21 s {I8} (2001Ga20). 


level_energy_unit: KEV
level_spin_parity: [7/2-]
level_lifetime_unit: S
level_lifetime_info: ;ISO=M1
level_comment:
J Expected from theory (2002Lo05). Other: 2008KeZY. 
T Weighted average of 2.6 s {I1} (2008Ha31), 2.53 s {I13} (2006Ch52), and 2.53 s {I5} (2008An16). 


level_energy_unit: KEV
level_energy_info: ;OFF=Y
level_spin_parity: (25/2+)
level_lifetime_unit: MS
level_lifetime_info: ;ISO=M2
level_comment:
T Other value: 1.4 ms {I1}, from 100-keV conversion electrons observed in coincidence with 588-keV |g ray (2008Ha31); 1.81 ms {I2} (2008An16). 


level_energy_unit: KEV
level_energy_info: ;OFF=Y
level_lifetime_unit: MS
level_lifetime_info: ;ISO=M2
level_comment:
E$From adopted levels. E>720 keV by 2008Ha31 based on 100-keV conversion electrons observed in coincidence with 588-keV |g-ray. Excitation energy of resultant level is >720 keV assuming M-conversion or >850 keV assuming K-conversion. This level may be the same reported at 1408+x keV (1.70 ms {I3}) in the {+209}Bi({+48}Ca,2n|g) reaction (2009Je02), and at >1600 keV (1.81 ms {I2}) in 2008An16. 
J$ from systematics this isomer is expected to have a high K value. Possible configuration: |n: 9/2[734] coupled to 7/2[613] or 3/2[622] or 1/2[620]; |p: 1/2[521], 7/2[514], 7/2[633], 5/2[512], 9/2[624]. The 3-qp |n|p configuration from above orbitals can give rise to many possible high-K 3-qp states. 
T$ from time difference between {+255}Lr recoils and conversion electrons (<140 keV electrons); single decay component was assumed. 


level_energy_unit: KEV
level_lifetime_unit: S
level_comment:
T$weighted average of 28 s {I1} (2014Sa21, earlier value was 25 s {I2} in 2010SaZV), 25.9 s {I17} (1976BeZY), 31 s {I3} (1971Es01), 35 s {I10} (1970Dr08), 45 s {I10} (1965Do10). Other: 24 s (1968Fl08) 
$The |a decay/|e decay ratio has been estimated approximately only. The authors of 1968Fl08 deduced the |e branch as about 30%, if the 8.42-MeV |a group in their spectrum is from the |e decay daughter, {+256}No. Presumably, the 8.43-MeV |a of {+256}Lr was not considered; therefore, this branching should be an upper limit. In authors' other paper, 1968Fl01, the authors stated that it was impossible to determine the branching from their data. The authors of 1971Es01 set an upper limit of 20% for an |e branch. It was established by 1976BeZY that {+256}Lr does decay by electron capture; however, its branching was not determined. %|e=15 {I10}, %|a=85 {I10} is recommended here. 


level_energy_unit: KEV
level_lifetime_unit: S
level_lifetime_info: ;ERR=AP
level_comment:
%EC+%B+ <15 (1971Es01) from absence of {+257}No |a's. 
%SF From 1970Fl16, 2000Ho27. T{-1/2}(SF)>1|*10{+5} s (1971Fl02). Calculated T{-1/2}(SF)|?30 s (1985Lo17) 
J favored |a decay to {+253}Md feeds two levels separated by |?65 keV (65 {I40}); if this indicates a rotational band then the band-head probably has 5/2|<J|<11/2. The possible Nilsson assignments are: 9/2[624], 7/2[514] and 1/2[512] (see above for calculations by 1994Cw01). 
T$1997He29: 3.3 s {I+5-4} from 887|a(t), 4.3 s {I+13-8} 8810|a(t); 4.1 s {I+24-13} (2009Qi04). Others: 0.646 s {I25} from 1976BeYM, 0.6 s {I1} (1971Es01) 


level_energy_unit: KEV
level_energy_info: ;OFF=X
level_lifetime_unit: S
level_lifetime_info: ;ERR=GT
level_comment:
$%|a=? 
$Discuss decay of 8878|a from this level (2016He08) 
$ Possible configuration=|p9/2[624]. 
T$From 2016He08 (by |a decay). 


level_energy_unit: KEV
level_energy_info: ;OFF=Y
level_lifetime_unit: MS
level_comment:
$%|a=?; %IT=? 
$Discuss decay of 8811|a from this level (2016He08) 
$ Possible configuration=|p1/2[521]. 
T$203 ms {I164-63} in 2016He08 (by |a decay). 


level_energy_unit: KEV
level_lifetime_unit: S
level_comment:
T$weighted average of measured values of 3.54 s {I+46-36} (2014Ha04, earlier values: 2.6 s {I+120-11} in 2012Mo25, 4.0 s {I+22-10} in 2009Mo12); 4.2 s {I+15-11} (1992Sc30); 3.92 s {I+35-31} (1992Gr02); 4.35 s {I59} (1976BeZY), and 4.2 s {I6} (1971Es01) 
$Decay modes from 2014Ha04. Others: SF decay of the |e-decay daughter was not detected and an upper limit of 5% was given by 1971Es01. T{-1/2}(SF)>20 s, measured by 1971Fl02, gives %SF<20. 1992Gr02 recorded one |a-SF correlation, probably due to {+262}Db |a followed by the |e decay of {+258}Lr to {+258}No, and 28 |a-|a correlations in their study of {+262}Db |a decay, and suggested that the |e and SF decay branches of {+258}Lr account for less than a few percent. 


level_energy_unit: KEV
level_energy_info: ;OFF=X
level_uncertain: ?
level_comment:
E$this level is treated as questionable as the 8530|a is observed by 1977BeZM only, and not identified clearly by 2014Ha04, even though in 1977BeZM the 8530|a is claimed as stronger than the 8670|a which was observed clearly by 2014Ha04 


level_energy_unit: KEV
level_energy_info: ;OFF=X
level_comment:
$From the favored |a (the hindrance factor of |?3.4) transition to this level, the configuration of this level is expected to be the same as that of its parent, the ground state of {+262}Db g.s. 


level_energy_unit: KEV
level_lifetime_unit: S
level_comment:
T$from average decay times of 12 events with 68% confidence interval (2020Ha27). Authors also give T{-1/2}=3.30 s {I+149-78} from 10 pairs of |a|a events. 
E$assuming the observed events correspond to the ground state. 
$only |a decay events were observed, with energies ranging from 8.34-8.64 MeV; the 8.34 MeV event is lower than the other 6 events, which are grouped between 8.59-8.64 MeV. 


level_energy_unit: KEV
level_lifetime_unit: S
level_comment:
T weighted average of 6.14 s {I36} (1992Ha22), 6.34 s {I+46-42} (1992Gr02). Other: 5.4 s {I8} (1971Es01) 
%SF$average of SF/|a=0.25 {I3} (1992Ha22) and 0.30 {I3} (1992Gr02). 
SF hindrance factor 6|*10{+3} (1992Gr02,1992Ha22).?? 
%EC+%B+ not observed. T{-1/2}(|e+|b{++})|?1|*10{+3} s from log| {Ift}|?5.7 
J favored |a decay to {+255}Md indicates same configuration as the daughter. See {+255}Md Adopted Levels. 


level_energy_unit: KEV
level_lifetime_unit: S
level_comment:
T measured by 1971Es01. 
$%|e<40 was estimated by 1971Es01 by comparing the number of {+260}Lr |a's observed with the number of {+260}No SF decay events; 40% was obtained when {+260}No is assumed to decay by spontaneous fission only. Since {+256}Fm was also produced in the reaction, the estimate for |e decay is very crude (1971Es01). 
$1997Mo25 calculated T{-1/2}(|e)>100 s. No |b half-life calculations for Z>100 nuclei are given in 1973Ta30. 


level_energy_unit: KEV
level_lifetime_unit: MIN
level_comment:
T from 1989HuZU; other: 44 min {I+17-11} (1991HeZT) 
%SF SF observed. However, not clear whether SF is from {+261}Lr, or from |e daughter {+261}No (1989HuZU,1991HeZT) 
Calculated T{-1/2}(|a)|?3|*10{+3} min (1997Mo25) 
Calculated T{-1/2}(SF)|?5 h (1989Mo03) 


level_energy_unit: KEV
level_lifetime_unit: H
level_lifetime_info: ;ERR=AP
level_comment:
T 212 min {I18} was measured by 1989HuZU from SF activities. 1990HuZV reported that the average of three experiments was 216 min, and that their later work indicated a half-life of closer to 4 h. 
SF branching was recommended by 2000Ho27 from measurements of R.W.Lougheed, et al, reported in UCAR 10062-87, 4-2 (1987). 
Observation of 5-ms SF activities correlated with the nobelium K x-rays shows that the nucleus decays by |e+|b{++}. Branching for |e+|b{++} decay, however, has not been determined. 
|a decay of {+262}Lr has not been observed. 
Calculations by 1997Mo25 yield T{-1/2}(|a)=40000 min. 


level_energy_unit: KEV
level_lifetime_unit: H
level_comment:
$Evidence for only the SF decay mode in 2022Og07. 2019Mo01 give theoretical |a-decay half-life of 40.8 y, making this decay mode negligible. Q(|b{+-}) value of 300 {I570} suggests this decay mode as forbidden. 
$Identification of {+264}Lr isotope by 2022Og07: authors observed |a-like events with E|a=7-10 MeV between decays of {+272}Bh and SF events in 50 out of 55 events, thereby establishing the |a decay mode of {+268}Db for the first time with E|a=7.6-8.0 MeV, together with the discovery of a new isotope {+264}Lr as |a-daughter of {+268}Db, with half-life determination of {+264}Lr and its SF decay mode. 
E$it is assumed that the observed activity corresponds to the ground state of {+264}Lr 
J$3+ or 6+ from |W{-p}=9/2+ and |W{-n}=3/2+ orbitals (2019Mo01, theory). 
T$from (Er)(SF)-correlated decays in the present experiment (2022Og07). 


level_energy_unit: KEV
level_lifetime_unit: H
level_uncertain: ?
level_comment:
E$observed activity is assumed to correspond to the g.s. of {+266}Lr 
T$measured by 2014Kh04. The |a decay mode is less likely as suggested by the theoretical half-life of 10{+10.7} y for |a decay (1997Mo25) 


level_energy_unit: KEV
level_lifetime_unit: H
level_comment:
E$observed activity is assumed to correspond to the g.s. of {+266}Lr 
T$from two fission events (2019Kh04) 
%SF$only spontaneous fission is observed 


level_energy_unit: KEV
level_spin_parity: (1/2+)
level_lifetime_unit: MS
level_comment:
%A$from ratio of |a to SF activities (2022Lo03). Other %|a: |?12.5 (2021Kh07). SF decay observed by 1997He29; SF and |a decay observed by 2021Kh07 and 2022Lo03. 
E$it is assumed that longer-lived and slow-fissioning activity is the ground state. Experimentally, however, the ordering of the energies of the two activities is unknown. Possibility exists for the reversal of the ordering in energy of the two activities. 
J$configuration=|n1/2[631] (2022Lo03). 2021Kh07 suggested 7/2+ for the g.s. with configuration=|n7/2[724]. Note that 2022Lo03 reversed the J|p assignments for the g.s. and the 52.8-|ms isomer from those proposed by 2021Kh07, based on systematics of fission hindrances and half-lives of the two activities. 
T$from SF decay curve (2022Lo03). Others: 5.7 ms {I+31-15} from Er-|a-correlated decay curve (2022Lo03); 12.8 ms {I+70-34} (2021Kh07, Er-|a decay); 11 ms {I+6-3} (1997He29). 


level_energy_unit: KEV
level_energy_info: ;OFF=X
level_spin_parity: (7/2+)
level_lifetime_unit: US
level_lifetime_info: ;ISO=M1
level_comment:
%SF$there is evidence for only the |a decay from 1997He29 and 2022Lo03 
E$x|<15 keV from the decoupling parameter of the |n1/2[631] configuration known from lighter isotopes, but x|?-105 keV from trend of the energies of the 1/2+ state in N=149 isotones as Z increases (2022Lo03). Based on discussion in 2022Lo03, it is assumed that the shorter-lived and fast-fissioning activity is the isomeric activity. Experimentally, however, the ordering of the energies of the two activities is unknown. Possibility exists for the reversal of the ordering in energy of the two activities. 
J$configuration=|n7/2[724] (2022Lo03). 2021Kh07 suggested 1/2+ for the g.s. with configuration=|n1/2[631]. Note that 2022Lo03 reversed the J|p assignments for the g.s. and the 52.8-|ms isomer from those proposed by 2021Kh07, based on systematics of fission hindrances and half-lives of the two activities. 
T$from SF decay curve (2022Lo03). Others: 44 |ms {I+17-10} (2021Kh07), 48 |ms {I+17-10} (1997He29,1999He11) 


level_energy_unit: KEV
level_energy_info: ;OFF=X;ERR=GE;ERR=?
level_lifetime_unit: MS
level_lifetime_info: ;ISO=M2
level_comment:
$Level identified from observation of seven isomeric decays followed by the fast fission of {+253}Rf (2022Lo03). From evidence of decay by isomeric transitions only, |?100% IT decay is assigned by inference, while there is no experimental information for the branching ratio. 
J$possible high-K isomer (2022Lo03) 
T$from 2022Lo03. Other: |?0.6 |ms (2021Kh07) 
E$energy removed by the isomeric cascades obtained from summing all the signals in the GABRIELA detectors (2022Lo03). 


level_energy_unit: KEV
level_spin_parity: 0+
level_lifetime_unit: US
level_comment:
$Only the SF-decay mode has been detected. An upper limit of 1.5% was given by 1997He29 from non-observation of |a particles and the total number of 155 SF events detected. 
T$weighted average of 20 |ms {I3} (2020Kh01, time distribution of 56 Er-fission correlated events); 23.2 |ms {I11} (2015Da12); and 23 |ms {I3} (1997He29,1999He11). Other: 29.6 |ms {I+7-6} (2008Dr05). If the value from 2008Dr05 is considered, then the unweighted average is 24.0 |ms {I20} and the weighted average is 27.7 |ms {I18}, but with an unacceptable reduced |h{+2}=12. Earlier assignments of T{-1/2}<3 ms in 1975Og01 and |?5 ms in 1975Te01 (both from the same laboratory) are most likely erroneous, as e.g. assignment of SF activity to {+254}Rf in 1975Te01 was inconclusive, as communicated privately by the first author 1975Te01 to the authors of 1997He29. 
$Production |s=0.40 nb {I+27-17} in {+208}Pb({+48}Ti,2n), E=4.6-4.8 MeV/nucleon (2008Dr05). 
$Production |s=3.8 nb {I4} for {+254}Rf at E({+50}Ti)=242.5 MeV (2020Kh01). 


level_energy_unit: KEV
level_energy_info: ;OFF=X
level_spin_parity: (8-)
level_lifetime_unit: US
level_lifetime_info: ;ISO=M1
level_comment:
$A cluster of three counts at 853 keV and two counts at 829 keV is seen in the spectrum of |g rays coincident with electrons, indicating two other possible transitions associated with the 2-qp isomer (2015Da12). 
$%SF<10%, deduced by 2015Da12 assuming 10 fissions from the 2-qp isomer, which is one standard deviation departure in the time interval between 1 |ms and 9 |ms in the ground-state decay-time distribution. No definitive evidence was found for this fission branch. 
$2020Kh01 estimated 16% {I5} of all the ERs assigned to the decay of {+254}Rf were observed with conversion electrons (CEs), which indicated isomeric yield in the reaction. 
E$x>1350 (2015Da12), from the sum of the 450-keV maximum energy of conversion electrons emitted from this isomer and the 893-keV |g-ray energy measured in prompt coincidence with those electrons 
T$weighted average of 4 |ms {I1} (2020Kh01, time distributions of electron-like signals relative to ERs correlated with fission fragments); and 4.7 |ms {I11} (2015Da12, decay time distribution of electrons emitted by the isomer). 
J$proposed configuration=|n7/2[624]~#|n9/2[734], K|p=8- (2015Da12) 


level_energy_unit: KEV
level_energy_info: ;OFF=Y
level_spin_parity: (16+)
level_lifetime_unit: US
level_lifetime_info: ;ISO=M2
level_comment:
$%SF<40%, deduced by 2015Da12, assuming that all the six fission events in the time interval of the 4-qp isomer decays originated from this isomer, although these six fission events could also be associated with the ground-state fission events following decays of the 4-qp isomer which may have escaped detection. 
$2020Kh01 mentioned that with their experimental arrangement it was not possible to detect the 247-|ms isomer. 
E$y>x (2015Da12), based on the longer-lived 4-qp isomer feeding the shorter-lived one, which is supported by the observed event chains of two successive electron bursts detected in between the implantation and the {+254}Rf ground-state fission and by the measured decay times of the first and second generation electrons in these events. 
J$proposed configuration=(|n7/2[624]+|n9/2[734])~# (|p7/2[514]+|p9/2[624]), K|p=16+ (2015Da12) 
T$from decay time distribution of electrons emitted by the isomer (2015Da12) 


level_energy_unit: KEV
level_spin_parity: (9/2-)
level_lifetime_unit: S
level_comment:
J$ analogy with N=151 nuclei ({+245}Pu,{+247}Cm,{+249}Cf, {+251}Fm); configuration=(|n9/2[734]) 
T$ From 2006He27. Others: 1.65 s {I+3-2} (2008Dr05), 1.64 s {I11} (2001He35), 1.4 s {I+5-3} (1997He29), 1.4 s {I+3-2} (1986He28), 1.4 s {I2} (1985He06), 1.5 s {I+3-2} (1984De07), 1.7 s {I2} (1984Og02,1984Og03), |?4 s (1975Og01). 
T$ 2001He35, 1997He29, 1986He28 and 1985He06 are from the same group as 2006He27, thus the half-life reported in 2006He27 is assumed to supersede values in the earlier papers. 
%SF from T{-1/2}(SF)=2.9 s {I4} (weighted average of 2.7 s {I5} (1985He06) and 3.1 s {I4} (1997He29), recommended in 2000Ho27), and T{-1/2}=1.68 s {I9} (2006He27). 
%SF. Others: %SF=52 {I5} (2001He35); 52 {I7} (1985He06,1986He28); 45 {I6} (1997He29); |?50 (1984Og03,1970Og01). From log| {Ift}|?6 and Q(|e)|?4400 %|e+%|b{++}|<1. 


level_energy_unit: KEV
level_energy_info: ;ERR=AP;ERR=?
level_comment:
E$ calculated E(1/2[620])=670 keV (1994Cw02) 
J$ favored |a decay from {+259}Sg suggests same quasiparticle configuration as that for {+259}Sg g.s. 


level_energy_unit: KEV
level_spin_parity: (9/2-)
level_lifetime_unit: S
level_comment:
$ Production |s=0.38 nb {I7} (2008Dr05) 
Others: 2011Ca08, 2010Wa39. 
T$ from 2008Dr05 
J$from Adopted Levels. 


level_energy_unit: KEV
level_energy_info: ;ERR=AP;ERR=?
level_spin_parity: (11/2-)
level_comment:
E$estimated by 2015An05 from the difference of Q values of E|a=9614 and 9040 keV lines from {+259}Sg ground state. This assignment is tentatively supported by the observation of two |a events with an energy |?9040 keV in coincidence with |g cascade of total energy of 594 and 536 keV. 
J$proposed by 2015An05 based on systematics of neighboring N=151 isotones, with possible configuration=|n11/2-[725]. 


level_energy_unit: KEV
level_spin_parity: (9/2-)
level_lifetime_unit: S
level_comment:
J$from Adopted Levels of {+255}Rf in ENSDF database 
T$extracted by 2015An05 from the time distribution of |DT(|a-SF) of the Er(evaporation residue)-|a-SF correlations. Other: 1.68 s {I9} from Adopted Levels of {+255}Rf in ENSDF database. 
$Configuration=|n9/2-[734] 


level_energy_unit: KEV
level_energy_info: ;ERR=AP;ERR=?
level_spin_parity: (5/2+)
level_lifetime_unit: US
level_lifetime_info: ;ISO=M
level_comment:
E$estimated by 2015An05 based on measured energies of conversion electrons 
J$proposed by 2015An05 based on the supposed M2 character for the transition deexciting this isomeric state to (9/2-) ground state (known in lighter N=151 isotones) and systematics of N=151 isotones. 
T$from the spectrum of measured time difference between |a decay and signal from the conversion electrons (2015An05) 
$Configuration=|n5/2+[622] 


level_energy_unit: KEV
level_energy_info: ;ERR=AP;ERR=?
level_spin_parity: (1/2+)
level_uncertain: ?
level_comment:
E$estimated by 2015An05 from the difference of Q values of E|a=9700 and 9200 keV lines. 
J$proposed by 2015An05 based on favored |a decay from (1/2+) 
$configuration=|n1/2+[620] 


level_energy_unit: KEV
level_spin_parity: (9/2-)
level_lifetime_unit: S
level_comment:
J$from {+255}Rf Adopted Levels in the ENSDF database (Nov 2011 update) 
T$measured by 2020Kh01 from 66 Er(fission fragments) with an average correlation time of about 2s. This value can be compared with 1.68 s {I9} in {+255}Rf Adopted Levels in the ENSDF database, and 1.54 s {I19} measured by 2015An05 (Eur. Phys. J. A51, 41) 


level_energy_unit: KEV
level_energy_info: ;ERR=AP;ERR=?
level_spin_parity: (5/2+)
level_lifetime_unit: US
level_lifetime_info: ;ERR=GT;ISO=M
level_comment:
$2020Kh01 estimated >14% of all the ERs assigned to the decay of {+255}Rf were observed with conversion electrons (CEs), which indicates isomeric yield in the reaction. 
T$measured by 2020Kh01 from time distributions of 16 electron-like signals relative to ERs correlated with fission fragments. This value can be compared with 50 |ms {I17} in 2015An05 
E,J$proposed by 2015An05 


level_energy_unit: KEV
level_spin_parity: 9/2-
level_lifetime_unit: S
level_comment:
T$from Er-fission events (2023Ch05). Other: 1.67 s {I5} from Er-alpha events. 
$an upper limit on |b{++}+|e branch was deduced as <0.06 {I2} 


level_energy_unit: KEV
level_energy_info: ;ERR=?
level_spin_parity: 25/2+
level_lifetime_unit: US
level_comment:
$configuration=|n9/2-[734]|p7/2-[514]|p9/2+[624] 
T$from Er-ce-ce(t) (2023Ch05) 
E$energy of 1238 keV given in Figure 7 is at odds with a 98 keV transition depopulating this level and feeding the 1205-keV level. 


level_energy_unit: KEV
level_lifetime_unit: US
level_lifetime_info: ;ISO=M1
level_comment:
T$from ce(t) considering conversion electrons in the range of larger than 370 keV (2020Mo11), with 13 events. 
E$estimated from summed energy of conversion electrons. Given by 2020Mo11 as 900-1200 keV. 
$suggested as a high-K, 3 quasiparticle isomer (2020Mo11). K > 17/2 (2020Mo11) 


level_energy_unit: KEV
level_lifetime_unit: US
level_lifetime_info: ;ISO=M2
level_comment:
T$from ce(t) considering conversion electrons in the range of 0-370 keV (2020Mo11) 
E$estimated from summed energy of conversion electrons. Given by 2020Mo11 as 1150-1450 keV. 2020Mo11 also state that the energy between the two isomers is 150-300 keV. 
$suggested as a high-K, 3 quasiparticle isomer (2020Mo11) 


level_energy_unit: KEV
level_spin_parity: 0+
level_lifetime_unit: MS
level_comment:
T$weighted average of 6.9 ms {I2} (2013Ri07, 2012Gr12 from time difference between recoil and fission events), 6.9 ms {I4} (2011Ro20, from time distribution of fission events in SF decay of 783 events), 6.70 ms {I9} (2008Dr05), 6.2 ms {I2} (1997He29), 6.7 ms {I2} (1984Og02). Other measurements: 5 ms (from SF activity, 1975Og01); 7.4 ms {I+9-7} (from SF activity, 1985He06); 10 ms {I+47-4} (from |a activity, 1985He06); 6.3 ms {I+27-14} (from SF activity following {+260}Sg |a decay, 1985Mu11); 9 ms {I2} (from SF activity, 1985So03). 
$The |a branching was determined by 1997He29 as (0.32|+0.17)%. Authors' earlier measurement: (2.2 +7.3-1.8)% (1985He06). 


level_energy_unit: KEV
level_spin_parity: (2+)
level_comment:
E$deduced from Harris fit of rotational band members (2012Gr12). Others: |?46 (2009Je01), 51 {I35} from {+260}Sg |a decay 
J$ |a hindrance factor; systematics of first excited-state energies of even-even nuclei. 


level_energy_unit: KEV
level_energy_info: ;ERR=AP;ERR=?
level_spin_parity: (5-)
level_lifetime_unit: US
level_lifetime_info: ;ISO=M1
level_comment:
J$assigned by 2013Ri07 as K|p=(5-) with possible 2-qp configuration=(|p1/2[521]~#|p9/2[624]){-5-} 
T$2011Ro20 state that their observed isomer of 17 |ms {I5} (half-life from time distribution of conversion electrons and maximum likelihood method) may correspond to the 25-|ms {I2} isomer in 2009Je01, although, the isomer population ratio of |?5% {I2} (with respect to that of {+256}Rf g.s.) is much smaller than |?27% deduced by 2011Ro20 from data in 2009Je01. Due to its low population and several other arguments against its assignment as a 2-qp isomer, 2011Ro20 suggest that their observed 17-|ms isomer is more likely a 4-qp state 


level_energy_unit: KEV
level_energy_info: ;ERR=AP;ERR=?
level_spin_parity: (8-)
level_lifetime_unit: US
level_lifetime_info: ;ISO=M2
level_comment:
E$isomer not found in 2011Ro20, perhaps due to low statistics 
J$assigned by 2013Ri07 as K|p=(8-) with possible 2-qp configuration=(|p7/2[514]~#|p9/2[624]){-8-} 
T$ other: 13.2 |ms {I33} (2010Be16) 


level_energy_unit: KEV
level_energy_info: ;ERR=GT;ERR=?
level_lifetime_unit: US
level_lifetime_info: ;ISO=M3
level_comment:
E$isomer not found in 2011Ro20, perhaps due to low statistics 
T$ other: 36.5 |ms {I86} (2010Be16) 
$Possible 4-qp state (2009Je01,2013Ri07) 


level_energy_unit: KEV
level_energy_info: ;ERR=AP;ERR=?
level_spin_parity: (8-)
level_lifetime_unit: US
level_lifetime_info: ;ISO=M2
level_comment:
E$isomer not found in 2011Ro20, perhaps due to low statistics 
T$ others: 13.2 |ms {I33} (2010Be16) 
J$assigned by 2013Ri07 as K|p=(8-) with possible 2-qp configuration=(|p7/2[514]~#|p9/2[624]){-8-} 


level_energy_unit: KEV
level_spin_parity: 0+
level_lifetime_unit: MS
level_comment:
T$from time difference between recoil implants and subsequent fission events for 1345 measured events (2023Is03) 
%A$from recoil-|a1-|a2 correlation measurements (2023Is03). Single |a correlation was found and corrected for 25% registration efficiency. 
$average number of neutrons = 4.30 {I17} following SF. 


level_energy_unit: KEV
level_energy_info: ;OFF=Y
level_lifetime_unit: US
level_comment:
T$from Er-ce-ce-fission (t) (2021Kh03) 
E$from Er-ce-ce-fission data, 2021Kh03 conclude this is the higher lying state and that the state populates the lower lying, E=x, isomer. 


level_energy_unit: KEV
level_spin_parity: (1/2+)
level_lifetime_unit: S
level_comment:
J In analogy with N=153 nuclei {+249}Cm and {+251}Cf (configuration=1/2+[620]). Calculations in 1994Cw01 predict this single-particle Nilsson configuration. 
T From 2009Qi04, recommended value in 2010Be16. Other values: 5.5 s {I4} (2010St14); 4.8 s {I2} (2010Be16); 7.2 s {I+13-11} (2008Dr05); 4.3 s {I+13-8} (1985He06); 3.8 s {I8} (1985So03); 4.8 s {I3} (1974BeWM); 4.8 s {I5} (1971Gh03); 4.5 s {I10} (1969Gh01). 


level_energy_unit: KEV
level_energy_info: ;ERR=AP;ERR=?
level_spin_parity: (11/2-)
level_lifetime_unit: S
level_lifetime_info: ;ISO=M
level_comment:
J Supported by alpha-hindrance factor HF=21 to {+253}No g.s. (9/2-[734]). T{-1/2}=4.1 s is consistent with this J|p assignment. 
T$From 2009Qi04, recommended in 2010Be16. Other values: 4.9 s {I7} (2010St14), 4.6 s {I3} (other value in 2010Be16), 4.1 s {I+7-6} (2008Dr05). 
From 1997He29, 1999He11. 
Decay branchings measured for a combined source of {+257}Rf (4.4 s) and {+257}Rf (4.1 s): %SF=2 {I1} (2009Qi04), %SF<3.5 (1985He06), %SF=14 {I9} (1985So03), %SF|?12 (1984Og03). Other: 2000Ho27. 


level_energy_unit: KEV
level_spin_parity: (21/2,23/2)
level_lifetime_unit: US
level_comment:
J |g rays to (21/2-) and (23/2-) in {+257}Rf. T{-1/2}=140 |ms is expected for |DK=5 or 6 transitions (2010Be16). 
T$From 2010Be16. Other values: 160 |ms {I+42-31} (2009Qi04); 109 |ms {I13} (2009Je01). 
E E|?1125 keV, measured with conversion electrons added to the energies of coincident |g rays, agrees with value from decay scheme. 


level_energy_unit: KEV
level_energy_info: ;ERR=AP;ERR=?
level_spin_parity: (11/2-)
level_lifetime_unit: S
level_lifetime_info: ;ISO=M
level_comment:
T From Adopted Levels 
Possible configuration 11/2-[725] 
E From E|a(167)=8778 keV 20, E|a(gs)=9016 keV 20 (2009Qi04), E|g(167)=167.5 keV 5 (2011An13) in {+253}No. Thus E(75)=(9016 - 8778)x 257/253 - 167.5=75 keV 


level_energy_unit: KEV
level_spin_parity: (21/2,23/2)
level_lifetime_unit: US
level_comment:
T$From 2010Be16. Other values: 160 |ms {I+42-31} (2009Qi04); 109 |ms {I13} (2009Je01). 
E E|?1125 keV, measured with conversion electrons added to the energies of coincident |g rays, agrees with value from decay scheme. 


level_energy_unit: KEV
level_spin_parity: (1/2+)
level_lifetime_unit: S
level_comment:
T$from recoil-(8.4|a-8.85|a MeV)(|Dt) using recoil-|a{-1}-|a{-2} events, where E|a{-1}=8.4-8.85 MeV ({+257}Rf gs decay) and E|a{-2}=7.9-8.2 MeV ({+253}No decay) in 2013Ri07 
CONF$|n(1/2[620]). The assignment is tentative 


level_energy_unit: KEV
level_spin_parity: (11/2-)
level_lifetime_unit: S
level_lifetime_info: ;ISO=M1
level_comment:
$Decay modes from Adopted Levels of {+257}Rf in ENSDF database 
E$from Q|a(gs)=9083 keV {I8} and Q|a(isomer)=9156 keV {I7} (2012Au07) 
T$from electron-(8.85|a-9.2|a MeV)(|Dt) using recoil-electron-|a{-1} events, where E|a{-1}=8.85-9.2 MeV ({+257}Rf isomer decay) in 2013Ri07 
CONF$|n(11/2[725]). The assignment is supported by the comparison of the experimental (g{-K}-g{-R})/Q{-0}=0.034 {I7}, deduced from the cascade to crossover branching ratios with g{-R}=Z/A and Q{-0}=14.3 eb, and a theoretical prediction of 0.040 (2013Ri07) 


level_energy_unit: KEV
level_spin_parity: (21/2+)
level_lifetime_unit: US
level_lifetime_info: ;ISO=M2
level_comment:
T$from electron decay curve of all (recoils)(electron)(|a from {+257}Rf decay) correlated events in 2013Ri07. Others: 109 |ms {I13} (2009Je01), 134.9 |ms {I77} (2010Be16) (reanalyzed in 2013Ri07 as 110 |ms {I5}) and 160 |ms {I+40-30} (2009Qi04). 
CONF$K|p=(21/2+), |n(11/2[725])~#|p{+2}(1/2[521],9/2[624]). The assignment is tentative. 


level_energy_unit: KEV
level_spin_parity: (1/2+)
level_lifetime_unit: S
level_comment:
T$from recoil-|a(t) (2022Ha04), including in the fit that 20 % {I20} of feeding is through the 4.37-s isomer. 


level_energy_unit: KEV
level_spin_parity: 0+
level_lifetime_unit: MS
level_comment:
$%|a from the number of SF and |a decays correlated to ce events (2016He15). Others: 31% {I11} (2008Ga08, from four |a-decay events, and 54 SF events, EVR-|a|a and EVR-SF correlation); indirect value of %|a=13 determined by 1984Og03 from ratio of fission events to {+246}Cf |a counts (|a-daughter of {+258}Rf). 
T$unweighted average of 9.4 ms {I+10-6} (2016He15, weighted average of several correlated decay curves); 14.7 ms {I+12-10} (2008Ga08); 13 ms {I3} (1985So03) and 11 ms {I2} (1969Gh01). Weighted average is 11.3 ms {I14}, but with a reduced |h{+2} of 5.1 as compared with critical |h{+2}=2.6 
T$2016He15 give the following half-lives from different sets of correlated decay curves and also photons: 10.0 ms {I11}, 10.1 ms {I30}, 10.9 ms {I+66-30}, 13.3 ms {I+58-31}, 6.2 ms {I31}, 4.7 ms {I+47-16}, 9.3 ms {I+26-17}; the last from photon decay curve. Weighted average of all these values is 9.4 ms {I+10-6}, and unweighted average is 9.2 ms {I11} 
$78 EVR-SF correlation events were observed at three highest beam energies. Four |a decay chains: {+258}Rf |a decay to {+254}No |a decay to {+250}Fm were identified and are listed in table II of 2008Ga08. Average E|a=9.05 MeV {I3} for decay of {+258}Rf to the g.s. of {+254}No. One event had E|a lower by 90 keV which was interpreted as transition to an excited state in {+254}No (2008Ga08) 
$Measured cross sections: 0.31 nb {I+16-12} at 138.5 MeV, 0.77 nb {I+20-18} at 144.5 MeV, 0.43 nb {I+13-11} at 151.4 MeV (2008Ga08) 
$1985He22, 1994Hu18, 1994Wi17: measurements of mass and total kinetic energy distributions of fission fragments. 
$Theoretical calculations of 1997Mo25 give T{-1/2}(|a)=74 ms which corresponds to %|a=16, in agreement with the branching determined in 1984Og03. 1997Po18 obtained also T{-1/2}(|a)=74 ms from semi-empirical formula. Other T{-1/2}(|a) calculations: 1976Ra02. Theoretical calculations for T{-1/2}(SF) from various methods gave results in the range of log T{-1/2}(SF in years)=-8 to -11. 


level_energy_unit: KEV
level_energy_info: ;OFF=Y
level_lifetime_unit: MS
level_lifetime_info: ;ISO=M1
level_comment:
T$from the time distribution of correlations between x-ray events (no coincident ce) and subsequent ce or x-ray events that could be from the decay of this state (2016He15) 


level_energy_unit: KEV
level_lifetime_unit: S
level_comment:
J analogy to {+253}Cf (N=155) suggests 7/2[613]. {+259}Rf |a decay does not seem to go to {+255}No g.s. with J|p=(1/2+). Therefore, J|p may not be the 1/2[620] Nilsson level as predicted by 1994Cw02. 
T$weighted average of 1.9 s {I+13-5} (2006Gr24), 2.2 s {I+17-8} (2004Fo08), 2.6 s {I+14-7} (2004Mo14), 1.7 s {I+8-5} (1994Gr08), 3.4 s {i17} (1985So03), 3.0 s {i13} (1981Be03), 3.2 s {i8} (1973Dr10). Other value: 3 s (1969Gh01). 
%SF weighted average of 6.3 {I37} (1981Be03) from SF/|a and 8 {I2} (1973Dr10), 9 {I3} (1985So03) from cross section calculations. Other: <20 (1971Gh02) 
%EC+%B+ log| {Ift}|?6 gives T{-1/2}(|e+|b{++})|?1000 s 


level_energy_unit: KEV
level_energy_info: ;OFF=X
level_comment:
E E=203 from Q(|a)({+263}Sg)=9403 syst (2012Wa38) and E|a=9060 {I40} 
E uncertainty in E(level) does not include the uncertainty in X. 


level_energy_unit: KEV
level_comment:
E$The |e decay mode is not observed in other studies when {+259}Rf (presumably the g.s.) is populated in the |a decay of {+263}Sg. This is explained (2008Ga08) by the possible existence of an isomer in {+259}Rf when directly formed in a reaction. This isomer apparently decays with T=2.5 s {I+4-3}, directly or through other states. 
T$From 27 EVR-|a correlations where random correlation was expected to be less than 1 (2008Ga08) 
$ %|e+%|b{++} branch determined from three EVR-|a correlated events and five EVR-SF correlated events as listed in table III of 2008Ga08. 
$ Measured cross sections: 0.44 nb {I+30-19} at 133.0 MeV, 1.6 nb {I+5-4} at 138.5 MeV, 0.38 nb {I+36-20} at 144.5 MeV, 0.19 nb {I+24-12} at 151.4 MeV 
$ 45 EVR-SF correlation events were observed at beam energies from 133.0 to 151.4 MeV. Three |a like events correlated with EVR were assigned as {+259}Rf |e decay to {+259}Lr followed by |a decay to {+255}Md. These events are listed in table III of 2008Ga08. Average E|a=8.4 MeV for decay of {+259}Lr to the g.s. of {+255}Md. 


level_energy_unit: KEV
level_spin_parity: 0+
level_lifetime_unit: MS
level_comment:
T measurement of 1985So03. Other measurements: 76 ms {I8} (1977Dr10), 23 ms {I2} (1981Ni01), 28 ms {I+6-5} (1985TeZX). Earlier measurements: 0.3 s {I1} (1964Fl04), 0.10 s {I5} (1970Og05), 80 ms {I20} (1976Dr06). 
$No 80-ms SF activity was observed by 1981Ni08 in {+249}Bk({+15}N,xn) reaction; no SF activities with half-lives of 80 ms and 60-100 ms in {+249}Bk({+15}N,4n), {+248}Cm({+16}O,4n) and {+249}Cf({+18}O,|a3n) reactions were observed by 1985So03. 
$For theoretical calculations of SF half-lives, see, for example, 1976Ra02, 1985Lo17, 1987Mo16, 1989St20, 1992Bh03. 
$Only SF decay has been observed. |a decay to {+256}No has not been observed (E|a=8760 {I200} is expected from Q(|a)=8900 {I200} listed in 1995Au04). 
$Branching for |a decay can be estimated by various methods. The r{-0} systematics presented in 1998Ak04 suggests that {+260}Rf |a decay should yield r{-0}({+256}No)=1.478 {I20}. By requiring the hindrance factor for a 8760-keV |a to be 1.0, T{-1/2}(8760|a)=1.5 s {I+10-5} is calculated. This |a half-life is consistent with the T{-1/2}(|a) systematics for g.s. to g.s. |a's (see, for example 1967Le24). If intensity of the unobserved 8.76-MeV |a is 80|+20 of the total |a decays, then the r{-0} systematics yields %|a=1.6 {I+9-6}. 
$From semiempirical formulas, 1997Mo25, 1997Po18 and 1976Ra02 calculated T{-1/2}1(|a)=0.89 s, 0.8 s and 0.14 s which yield %|a=2.26, 2.5 and 15, respectively. 
$An upper limit of %|e<2.5 was placed by 1977Be36 from nonobservation of delayed coincidences of SF events with Rf x-rays. Intensity of an |e branch to {+260}Lr ground- or a low-lying state may be estimated as <0.001% by requiring log| {Ift} for this branch to be >5.0. 
$The authors of 1997Mo25 calculated the |b decay half-life of {+260}Rf as >100 s, corresponding to %|e<0.02. 
$%SF=98 {I2}, %|a=2 are recommended by the evaluator, for the reasons given above, although these have not been determined experimentally. 


level_energy_unit: KEV
level_spin_parity: 0+
level_lifetime_unit: MS
level_comment:
T$ from EVR-SF correlations (2008Ga08) 
$ |a decay mode was not observed, the upper limit is at 86% confidence level. 
$ Measured cross sections: 0.050 nb {I+30-20} at 121.8 MeV, 0.17 nb {I+8-5} at 128.1 MeV, 0.18 nb {I+8-6} at 133.0 MeV 
$ 32 EVR-SF correlation events were observed at three lowest beam energies. 


level_energy_unit: KEV
level_spin_parity: 0+
level_lifetime_unit: MS
level_comment:
T$from SF(t) in the 0.1 s on/0.1 s off irradiation cycle using the 101.3-MeV data. Note, that T{-1/2}=21 ms {I1} in {+260}Rf Adopted Levels in ENSDF database; 22.2 ms {I+30-24} (2008Ga08: Phys. Rev. C77, 034603); and 21.0 ms +73-43 (A. Gorshkov et al., GSI Scientific Report 2008, p. 140) 


level_energy_unit: KEV
level_energy_info: ;OFF=X
level_lifetime_unit: S
level_comment:
$This level was labelled {+261}Rf{+a} by 2008Du09 as possible g.s. 
T$from 2008Du09 
$Others: 65 s {I10} (1999Ar21,1970Gh01); 65 s (1994Lo27, 1994La22); 78 s {I+11-6} (1996Ka66,2002Ho11); 74 s {I+7-6}; 75 s |+ 7 recommended as weighted average including 1996Ka66 (2000Sy01); 81 s {i9} (2012Au07 for isomer); 20 s {I+110-10} (2008Dv02); 71 s {I+342-33} (2008Ga08); 74 s {I+74-25} (evaluated value) using the approximations of 1984Sc13 for events 8, 11, 33 and 49 in 2008Du09. 
$T{-1/2}(SF)|>11 min (2000Ho27); >709 s (1996Ka66) 
$T{-1/2}(calc)=61 s for Q(|a)=8.409 MeV (2013Mu08) using Viola-Seaborg systematics for g.s. 
$%|a>80, %SF<10, %|e+%|b{++}<15 (1999Ar21,1970Gh01); 
$%|a=?; %|b{++}<15; %SF <10 (2012Au07 for isomer); %SF <11 (2002Ho11) 
$%SF<0.11 (2008Du09) from a re-evaluation of data; 
$%SF<0.13 (68% c.i. from 2011Ha13). 
E$Average E|a=8280 keV 40 (Q(|a)=8409 keV 40) from 25 correlated |a decay events (2013Mu08); Average E|a=8280 keV 50 (Q(|a)=8409 keV 50) from 113 events (2011Ha13) 
This may be the possible g.s., based on systematics (evaluators) and consistent with the findings of 2008Du09. 
J 2012Au07 suggest 9/2+ and denote this as an isomeric state in agreement with 2002Ho11. 2003Au02 had suggested 9/2+ or 3/2+ based on systematics. 9/2+ is recommended by evaluators for the g.s. 
J$|W(n)=7/2+ from 1997Mo25 
$|b{-2}(theory): 0.228 from 1995Mo29; 0.251 from 2003Mu26 


level_energy_unit: KEV
level_energy_info: ;OFF=X
level_lifetime_unit: S
level_lifetime_info: ;ISO=M1
level_comment:
$This level was labelled {+261}Rf{+b} by 2008Du09 as possible isomer. 
$%2011Ha13 values at 68% c.i. Others: %SF=91 (2008Du09,2008Dv02); %SF=82 {I9}, %|a=18 {I9} (2012Ha05). %SF=40, as g.s. (2002Ho11,2003Tu05); %SF=88 {I5} %|a=12 {I5} (2013Mu08); %SF|?82 (2012Ha05); %SF=73 {I6} %|a=27 {I6} (2012Au07 as g.s.). 
E$Calculated from E|a difference 
T$from 9 |a-decays and 86 SF events (2011Ha13). Other: 3.26 s as g.s. (1996Ho13); 4.2 s {I+34-13} as g.s. (2001Ho11). 1.8 s |+4 from 86 SF events; 1.9 s |+4 for 9 |a events and 88 SF events (2011Ha13); 2.2 |+ 3 s (2012Au07 as g.s.) 
$T{-1/2}(SF): >709 s (1996Ka66); 2.6 s {I+7-5} from 22 fission events (2012Ha05); 7 s {I+31-3} (2008Ga08)from one observation pending confirmation and computed by evaluators using the method of 1984Sc13. 
$T{-1/2}(calc)=10 s for Q(|a)=8.653 MeV (2011Ha13) using Viola-Seaborg systematics for g.s. 
$E|a=8510 keV 60 (Q(|a)=8642 keV 60) from 7 |a events (2012Ha05); 8520 keV 50 (Q(|a)=8653 keV 50) from 9 |a events (2011Ha13) 
$Q(|a)=8646.42 keV 50.00 from 2012Wa38 for ground state. 
J 1/2+ is recommended based on systematics (evaluators). 2012Au07 suggest 3/2+ for this level as g.s. 


level_energy_unit: KEV
level_spin_parity: 0+
level_lifetime_unit: S
level_comment:
T the measured half-lives are 1.2 s {I+10-5} (obtained by 1994La22 from correlation times for |a-SF events in {+266}Sg |a decay), 2.1 s {I2} (1996La11), 2.5 s {I+24-16} (1998Tu01). Earlier measurements: 1985So03, 1978NiZW. 
Only the SF decay mode of {+262}Rf has been observed. 
No |a decay from {+262}Rf was observed, and an upper limit of 0.8% was set by 1996La11. |a-SF correlation ({+258}No decays by SF) was searched by 2000La34, none was detected, and an upper limit of 3% was estimated. 
Various calculations for spontaneous fission half-life gave values ranging from 300 |ms to 15 min. See 1989Mo03, 1989St20, 1985Lo17, 1978Po09 and 1976Ra02. 
Calculated partial half-life for |a decay by various methods also do not agree with each other: T{-1/2}(|a)=2630 s by 1997Mo25; T{-1/2}(|a)=7 s by 1997Po18 [E|a=8670 was used in their semiempirical formula; no correction has been made for E|a(g.s. to g.s.)|?8360 from Q(|a)=8490 syst (1995Au04)]; log T{-1/2}(|a)=-7.42 y [T{-1/2}(|a)=1.2 s] by 1976Ra02. 
Calculations of 1997Mo25 gave T{-1/2}(|b)>100 s. 


level_energy_unit: KEV
level_uncertain: ?
level_comment:
The level energy is calculated by the evaluator from E|a=8520 and E|a(to gs)=8770. If E|a(to gs)=8630, then E(level)=112 {I50}. 


level_energy_unit: KEV
level_spin_parity: 0+
level_lifetime_unit: MS
level_comment:
T$from SF(t) in the 0.1 s on/0.1 s off irradiation cycle using 88.1-MeV data. Note, that T{-1/2}=47 ms {I5} (1985So03: Phys. Rev. C31, 1801) and 210 ms {I+128-58} (A. Gorshkov et al., GSI Scientific Report 2008, 140 (2009)) were previously assigned to {+262}Rf, together with the longer values of 2.5 s {I+24-16} (1998Tu01: Phys. Rev. C57, 1648); 2.1 s {I2} (1996La11: Phys. Rev. C53, 2893); and 1.2 s {I+10-5} (2000La34: Phys. Rev. C62, 064307; 1994La22: Phys. Rev. Lett. 73, 624), the latter may be associated with {+261}Rf decay. In {+262}Rf Adopted Levels in ENSDF database as of August 2001, T{-1/2}=2.3 s {I4} taken from 1998Tu01, 1996La11, and 1994La22; this half-life may belong to an isomer in {+261}Rf 


level_energy_unit: KEV
level_lifetime_unit: MIN
level_comment:
T,%A cited in 1997Au04 
T calculated T{-1/2}(|a)|?6|*10{+5} s (1997Mo25); T{-1/2}(|a)|?4|*10{+3} s (1990Ha26); T{-1/2}(|a)|?2|*10{+5} s, T{-1/2}(SF)|?1|*10{+4} s (1988Lo03) 


level_energy_unit: KEV
level_lifetime_unit: MIN
level_comment:
E$it is assumed that the observed activity corresponds to the ground state of {+265}Rf 
T$measured by 2015Ut02 from |a(SF)-correlation timing Theoretical SF decay half-life |? 1 s (1997Sm03). Theoretical |a decay half-lives: 6.58 h (generalized liquid drop model, 2008Ro06), 29.6 h (Viola-Seaborg-Sobiczewski formulas, 2008Ro06); |?2.8 h (1997Sm03), 5.6 y (1997Mo25). Theoretical |b-decay half-life >100 s (1997Mo25). 
J$3/2+ proposed in calculations by 1997Mo25 


level_energy_unit: KEV
level_lifetime_unit: S
level_comment:
J suggested g.s. configuration=(|p 9/2[615]) (1994Cw02) 
T from 1983OgZW; other: 1.5 s (1977FlZY). 
%SF,%A branching from 1977FlZY, 2000Ho27, SF observed. 
From log| {Ift}|?6, T{-1/2}(|e+|b{++})|?100 s (evaluators) 
Produced by {+207}Pb({+51}V,3n) (1977FlZY); {+209}Bi({+48}Ti,2n) (1983OgZW) 


level_energy_unit: KEV
level_lifetime_unit: MS
level_comment:
T$averaged from |a(t) and SF(t) with SF the dominant factor (2024Po17). 
$Production of {+255}Db is |s(2n,max) = 0.099 nb {I31} at E=251 MeV {I2} and {+256}Db is |s(n,max) = 0.49 nb {I7} at E=243 MeV {I2} (2024Po17). 


level_energy_unit: KEV
level_lifetime_unit: S
level_comment:
%A$weighted average taken by 2008Ne01 of their result, which is not stated in the paper but presumably 76% {I11}, and %|a=64 {I12} implied from measured %|e=36 {I12} by 2001He35 
$%|e=100-%|a. Other: 36% {I12} (2001He35) 
$2001He35 did not find any evidence for SF decay mode of {+256}Db, however, did observe SF events while studying the decay of {+256}Db. These SF events were ascribed to the decay of {+256}Rf, |e daughter of {+256}Db. The SF decay events observed by 1983OgZX in the decay study of {+256}Db were most likely due to the same decay process 
E$the 1.6-s activity is assumed to belong to g.s. of {+256}Db 
J$in theoretical calculations by 1997Mo25, 1/2- proton and 9/2+ neutron orbitals were specified, which would suggest J|p=4-,5- 
T$from (implants)|a-correlations (2001He35). Other values from 2001He35 from SF events are: 2.3 s {I+11-6} and 1.7 s {I+9-4}, in agreement with their adopted value but much less precise. 1983OgZX obtained T{-1/2}=2.6 s {I+14-8} from SF observed in {+209}Bi({+49}Ti,2n) reaction and in {+260}Bh |a decay. Weighted average of all the four values is 1.8 s {I+4-2}, but the evaluator prefers the value recommended by 2001He35 
$Theoretical half-lives (1997Mo25) of 15.1 s for |a and 22.9 s for |b decays, for example predict %|a=17.2 and %|b{++}=11.4 which suggest %SF=71.4. Theoretical calculations by 1985Lo17 predict T{-1/2}(SF)|?0.01 s, suggesting %SF|?100, which is in disagreement with experimental results from 2008Ne01 and 2001He35, who determined large |a and |b branches, and no evidence of SF decay 


level_energy_unit: KEV
level_lifetime_unit: S
level_comment:
E$the 1.6-s activity is assumed to belong to g.s. of {+256}Db 
T$from Adopted Levels 
%A$from 2008Ne01, based on %|e=36 {I12} (2001He35), thus %|a=64 {I12}, and %|a obtained by 2008Ne01, which is not stated but probably is 76% {I11} 


level_energy_unit: KEV
level_spin_parity: (9/2+)
level_lifetime_unit: S
level_comment:
J Predicted configuration=9/2+[624] 
T From 2009He20. Other values: 1.5 s {I+9-4} (2010He11); 1.82 s {I+27-21} (2008Ga25); 1.50 s {I+19-15} (2001He35); Others: 1999He11, 1989Mu09 


level_energy_unit: KEV
level_energy_info: ;ERR=AP;ERR=?
level_spin_parity: (1/2-)
level_lifetime_unit: S
level_lifetime_info: ;ISO=M
level_comment:
J Predicted configuration=1/2-[521] 
T From 2009He20. Other values: 0.36 s {I+22-9} (2010He11); 0.58 s {I+13-9} (2008Ga25); 0.76 s {I+15-11} (2001He35). 
E Based on EL(5/2-)|?600 keV and EL(5/2-) - EL(1/2-)|?230 keV, using an estimated 70 keV for E(ce) of the 470-keV (3/2-) to 370- keV (1/2-) expected |g-ray transition. 


level_energy_unit: KEV
level_energy_info: ;ERR=AP;ERR=?
level_spin_parity: (5/2-)
level_comment:
J Predicted configuration=5/2-[512] 
E Estimated from Q(|a)=10502 keV (2011AuZZ) and E|a=9900-10400 keV to this level. 


level_energy_unit: KEV
level_spin_parity: (9/2+)
level_lifetime_unit: S
level_comment:
J Predicted configuration=9/2+[624] 
T$From 2009He20 
%A,%SF From 2001He35 
$Emitted alpha particles: 9063 keV {i20}, 8956 keV {i20} (2010He11); 9066 keV {i20}, 8965 keV {i20}, 8874 keV {i20}? (2009He20); 9074 keV {i10}, 8967 keV {i15} (2001He35). Others: 1999He07, 1986He28, 1985He22. 


level_energy_unit: KEV
level_energy_info: ;ERR=AP;ERR=?
level_spin_parity: (1/2-)
level_lifetime_unit: S
level_lifetime_info: ;ISO=M
level_comment:
%A,%SF From 2001He35 
J Predicted configuration=1/2-[521] 
T From 2009He20. See {+261}Bh |a decay for other values. 
Emitted alpha particles: 9168 keV {i20} (2010He11); 9155 keV {i20} (2009He20); 9163 keV {i10} (2001He35). Others: 1999He07, 1986He28, 1985He22. 


level_energy_unit: KEV
level_spin_parity: (5+,6+)
level_lifetime_unit: S
level_comment:
$|e decay to excited states including two newly-proposed isomeric states in {+258}Rf (2016He15) 
T$from 2009He20. In their later work, 2016He15 report 4.4 s {I10} and 3.6 s {I3} activities from the time distributions of SF events, correlated and uncorrelated with conversion electron events, respectively, which could support the existence of two long-lived states in {+258}Db as claimed in their |a-decay study in 2009He20, but is not a sufficient argument for an unambiguous claim by itself in the work of 2016He15. Others: 4.2 s {I+4-3} (2008Ga25, from 77 correlated |a decays); 4.2 s {I+16-5} (1984Og03, SF decay of {+258}Rf, daughter of {+258}Db was detected); 4.4 s {I+9-6} (1985He22; |a from {+262}Bh decay); 3.0 s {I+8-6} (1989Mu09, |a from {+262}Bh decay); 4.3 s {I11} (2001Ga20, from |a of {+258}Db decay); 1.8 s {I+11-7} and 4.0 s {I+10-8} (1981Mu06, |a decays from {+262}Bh and {+258}Db); 6.1 s {I+10-8} (1985He22, from SF activities). 
J$from shell-model calculations (2016He15). Possible configurations: |n11/2[725] + |p1/2[521] for 6+ or |n9/2[624] + |p1/2[620] for 5+ 
$Production cross sections in {+208}Pb({+51}V,n) (2008Ga25): 0.23 nb {I+52-19} at E({+51}V)=236.1 MeV, 2.07 nb {I+110-76} at E({+51}V)=239.7 MeV, 1.00 nb {I+46-33} at E({+51}V)=244.1 MeV, 0.57 nb {I+55-31} at E({+51}V)=247.2 MeV, <0.59 nb at E({+51}V)=250.8 MeV, <0.18 nb at E({+51}V)=255.0 MeV. 
$Production cross sections in {+209}Bi({+50}Ti,n) (2008Ga25): 0.055 nb {I+250-45} at E({+50}Ti)=229.5 MeV, 2.55 nb {I+72-55} at E({+50}Ti)231.8 MeV, 5.5 nb {I+17-14} at E({+50}Ti)=233.6 MeV, 3.4 nb {I+19-14} at E({+50}Ti)=236.0 MeV, 2.6 nb {I+12-9} at E({+50}Ti)=238.4 MeV 


level_energy_unit: KEV
level_energy_info: ;OFF=X
level_spin_parity: (1-)
level_lifetime_unit: S
level_lifetime_info: ;ISO=M1
level_comment:
$|e decay to g.s. and probable low-lying states in {+258}Rf (2016He15) 
T$from 2016He15, taken from authors' earlier work in 2009He20. 2016He15 report 4.4 s {I10} and 3.6 s {I3} from the time distributions of SF events, correlated and uncorrelated with conversion electrons, respectively, which could support the existence of two different long-lived states in {+258}Db as claimed from their |a-decay study in 2009He20, but not sufficient for an unambiguous claim by itself in 2016He15. 
J$from shell-model calculations (2016He15). Possible configuration: |n1/2[620] + |p1/2[521] for 1- 


level_energy_unit: KEV
level_energy_info: ;OFF=Y
level_lifetime_unit: S
level_lifetime_info: ;ISO=M2
level_uncertain: ?
level_comment:
$Existence of this isomer has not been established. 
$No |a decays were observed from this activity (1985He22). 
T$deduced by 1985He22 based on difference in half-lives observed from |a decay (4.4 s) and SF (6.1 s {I+10-6}); the larger value was explained by 1985He22 by postulating a 20-s isomer in {+258}Db which decays by |e to {+258}Rf which in turn decays by SF with T{-1/2}=12 ms. 


level_energy_unit: KEV
level_spin_parity: [9/2+]
level_lifetime_unit: S
level_comment:
T From 2001Ga20, 2002Gu33. 
Alpha decay: E|a=9470 (Q(|a)=9619) keV (2001Ga20,2002Gu33). Calculated values: Q(|a)=9655 KeV, T{-1/2}=0.0903 s (2009Do22,2008Do12). Other calculations: 2008Ro06, 2007Zh41. 
Calculated: T{-1/2}(|a)=0.14 s, T{-1/2}(|e+|b{++})=92 s (1997Mo25); T{-1/2}(SF)|?1|*10{+2} s (1988Lo03). 
J$Based on theory (2002Lo05,1994Cw02). J|p=(1/2-) also predicted by theory (1997Mo25). 


level_energy_unit: KEV
level_lifetime_unit: S
level_comment:
T the measured half-lives are 1.52 s {I13} (1977Be36), 1.4 s {I+6-3} (1971Dr01), 1.6 s {I3} (1970Gh02). 
$From |a counts and spontaneous-fission events, 1977Be36 obtained %|a=90.4 {I6}, %SF=9.6 {I6}. Most of the interfering longer-lived SF events were subtracted. Because of some uncertainty in SF events' origin, as pointed out by 1977Be36, this SF branching should be considered an upper limit (following |a and |e decays, the granddaughter {+256}No also decays by spontaneous fission; if {+260}Db |e decays, then the observed SF events are expected to include contributions from the SF decay of {+260}Rf, too). The upper limit for |e decay was determined by 1977Be36 from absence of Lawrencium x-rays in their spectrum. Other measurements: %SF<20, %|e<20 (1970Gh02). 
$Theoretical calculations of 1997Mo25 yield T{-1/2}(|a)=4.07 s, T{-1/2}(|b)>100 s. 
$See 1985Lo17 for calculated SF half-life. 
$For calculated fission barriers, see, for example, 1985Cw01. 


level_energy_unit: KEV
level_lifetime_unit: S
level_comment:
T from 1.8 s {I6} (1971Fl02) and 1.8 s {I6} (1971Gh01) 
%SF from 1998La30; other: <50 (1971Gh01) 
Calculated: T{-1/2}(|e+|b{++})>100 s, T{-1/2}(|a)=1.8 s (1997Mo25); T{-1/2}(SF)|?1|*10{+2} s (1988Lo03) 


level_energy_unit: KEV
level_lifetime_unit: S
level_comment:
T from measured half-lives: 40 s {I10} (1971Gh01), 32.6 s {I65} (1977Be43; from SF decay), 34.1 s {I46} (1977Be43; from |a decay), 35.2 s {I+104-72} (1979Dr07; from SF decay), 33.5 s {I94} (1989Kr17; from SF decay), 35.3 s {I123} (1989Kr17; from correlated |a's), 27 s {I+20-11} (1999Dr09; from |a's). 
$%SF+%|e+%|b{++}|?33 
The |a branching of |?67% is adopted from the data of 1992Kr01. The SF branching of |?33% deduced by 1992Kr01, may include (|e+|b{++}) branching. An upper limit of |?5% for |e+|b{++} branch was obtained by 1977BeZM (see also 1977BeWH) from the absence of L| x ray(Z=104) or K| x ray(Z=104) preceding fission, by assuming T{-1/2}({+262}Rf)|<150 |ms. The adopted half-life of {+262}Rf is 2.3 s {I4}. 
|a and SF branchings were obtained in various experiments from |a and fission counts: %SF or %|e|?60 (1971Gh01), %SF=78 {I6} (1977Be43), %SF|?60 (1979Dr07), %SF=49 {I18} (1988Gr30), %SF=51 {I11} (1989Kr17), %SF|?33 (1992Kr01). 1971Gh01 addressed the possibility of including SF counts also from decay of {+262}Rf, probable |b{++} decay daughter of {+262}Db, and counts from {+263}Db and {+263}Rf. Because of insufficient data, none of these possibilities was ruled out. The authors of 1992Kr01 examined the {+263}Db production in their {+249}Bk({+18}O,xn) reaction at E({+18}O)=93 and 99 MeV. The {+263}Db nucleus decays by spontaneous fission, and its half-life is 27 s (1992Kr01). Different ratio of {+262}Db/{+263}Db nuclei produced in various experiments could explain the inconsistent branchings deduced. 
1997Mo25 calculated the partial half-lives for |a and |b{++} decays and obtained T{-1/2}(|a)=78.86 s, T{-1/2}(|b{++})=68.99 s for {+262}Db g.s. The partial half-life for SF decay was calculated by 1985Lo17 as T{-1/2}(SF)|?32 s, and calculated by 1989Mo03, using two different methods, as 1.9 d and 71 d. See 1985Cw01 for calculation of fission barriers. 


level_energy_unit: KEV
level_energy_info: ;OFF=X
level_comment:
Level is populated in {+266}Bh |a decay. Q(|a)({+266}Bh)=9550 {I300}, obtained by 1995Au04 from Q(|a) systematics, suggests E(level)=118 {I+320-118}. 


level_energy_unit: KEV
level_lifetime_unit: S
level_comment:
T$from average decay times of 21 events with 68% confidence interval (2020Ha27). Authors also give T{-1/2}=32.3 s {I+92-59} from 20 pairs of |a|a and |a-SF events. 
E$assuming the observed events correspond to the ground state. 
%SF$from observed 8 |a|a events and 12 |a-SF events (2020Ha27) 
$observed |a energies fall into two groups, 8.39-8.49 MeV and 8.62-8.70 MeV. 


level_energy_unit: KEV
level_lifetime_unit: S
level_comment:
T from 1992Kr01 
%SF from 1992Kr01. SF with broadly symmetric mass distribution with an average post-neutron-emission TKE=207 MeV {I7} (1992Kr01). 
%EC+%B+ From Q(|e)=2360 {I250} (systematics, 1995Au04) and log| {Ift}|?6 T{-1/2}(|e+|b{++})|?1000 s 
Calculated T{-1/2}(|a)|?1|*10{+4} s, T{-1/2}(SF)|?100 s (1988Lo03); T{-1/2}(|a)|?100 s (1990Ha26) 


level_energy_unit: KEV
level_lifetime_unit: H
level_comment:
$The SF decay mode was observed, but |a decay and/or |e+|b{++} modes are not excluded (2017Og01) 
J$1-,2- from |W(proton)=1/2- and |W(neutron)=3/2+ (1997Mo25, theory) 
T$22 min {I+105-10} (2017Og01 and 2015Og05 reviews) based on data for one decay chain observed in 2007Og02 


level_energy_unit: KEV
level_lifetime_unit: H
level_comment:
$Only the SF decay mode has been observed, however, 2015Og05 (also 2015Og01) review article states that |a or |e/|b{++} decay mode is not excluded 
E$the reported activity is assumed to belong to the g.s. of {+268}Db 
J$6-,7- from |W(proton)=1/2-; |W(neutron)=13/2+ (1997Mo25, theory) 
T$from 2016Fo10, based on detailed statistical analysis of 96 observed correlated events, starting from {+288}Mc, in three laboratories (FLNR-JINR-Dubna, GSI and Berkeley). Others: 28.3 h {I+33-26} (2017Og01 review; 26 h {I+4-3} 2015Og05 review). Measurements: 16 h {I+19-6} (2004Og03,2005Og02, from three correlated events); 32 h {I+11-7} (2005Dm03, from 15 events); 28 h {I+11-4} (2007St18, from 23 events); 27 h {I+5-4} (2013Ru11, from all the known decay chains; 25 h {I+4-3} in 2015Ru11); 25.9 h {I+62-42} (2013Og01, update of 27.9 h {I+78-50} in 2012Og02 and 29 h {I+9-6} in 2011Og07 review). 


level_energy_unit: KEV
level_lifetime_unit: H
level_comment:
$Compiler's note: in {+268}Db Adopted Levels in the ENSDF database (Jan 2019 update), %SF|?100 was assigned, with a comment that 2015Og05 review article stated that |a or |e/|b{++} decay mode was not excluded. 2022Og07 have confirmed |a decay of {+268}Db to a new |a-daughter  
E$it is assumed that the observed activity corresponds to the ground state of {+268}Db 
$E|a=7.6-8.0 MeV (2022Og07) 
T$from (Er)(|a)-correlated decays in the present experiment (2022Og07). Other: 28 h {I3} in {+268}Db Adopted Levels in the ENSDF database (Jan 2019 update), where value was adopted from 2016Fo10 (Nucl. Phys. A953, 117). 


level_energy_unit: KEV
level_lifetime_unit: H
level_comment:
$By combining the data from Dubna work (2013Og04,2011Og04), 2014Kh04 assigned |a decay of {+270}Db to five decay chains to |a decay and only one decay chain to SF decay, based on which the authors assigned |?17% decay branch to SF decay mode, which is in disagreement with the Dubna work (2013Og04, 2011Og04 and 2015Og05, 2017Og01 reviews) where dominant decay mode is assigned as SF decay, while not excluding |a or |e decay mode entirely. See detailed discussion in section IV of 2013Og04, where comparison is made between decay modes of {+270}Db and {+268}Db, with a conclusion that |a decay mode of {+270}Db is unlikely. 
$Considering the following statement in 2015Og05 review about the two events in 2014Kh04 where |a decay of {+270}Db is reported, the evaluator adopts the half-life and decay mode from 2015Og05 based on Dubna work reported in 2013Og04 and 2011Og04: "However, the probability of a random origin for both of these events, which can be extracted from the data given in [89], is rather large and reaches 0.5 (see discussion in [29]). We do not include these results for {+270}Db in Table 1 and Figs. 5 and 8 below because detailed analysis of data is not complete (reference [36]in [89])". Reference [89] is 2014Kh04, reference [29] is 2015Og01. 
E$the observed SF or |a activity is assumed to correspond to the ground state of {+270}Db 
J$1-,4- from |W(proton)=5/2-, |W(neutron)=3/2+ (1997Mo25, theory) 
T$from 2017Og01 and 2015Og05 reviews. Measurements: 1.0 h {I+19-4} for |a decay mode from two decay chains, also T{-1/2}=1.1 h {I+15-4} (2014Kh04) by combining their data with those from 2013Og04; 17 h {I+15-6} (2013Og04, 2012Og06 from a total of four correlated decay chains, all assigned as SF decay of {+270}Db in contrast to the work of 2014Kh04 where dominant |a decay mode is assigned); 23 h {I+110-10} (2010Og01,2011Og04, from one correlated event, with assigned SF decay mode of {+270}Db). Note that in one correlated decay event reported in 2013Og04, short interval of 1.156 h was recorded between the |a decay of {+274}Bh and SF decay of {+270}Db, but this was not correlated with any |a decay. Note that in 2017Au03 (NUBASE-2016), T{-1/2} is adopted as 2.0 h {I13} by symmetrization of T{-1/2}=1.0 h {I+19-4}, determined by 2014Kh04 from dominant |a decay mode of {+270}Db, yet the decay mode in 2017Au03 is assigned as 100% SF taken from Dubna work, which in evaluator's opinion presents an inconsistent scenario. 
$E|a=7.90 MeV {I3} from decay of {+270}Db (2014Kh04); the |a decay mode reported only by 2014Kh04. 2015Og05 review article discusses the works from Dubna (2013Og04, 2011Og04) and GSI (2014Kh04), and concludes the SF decay of {+270}Db as a dominant mode. 


level_energy_unit: KEV
level_lifetime_unit: H
level_comment:
E$observed activity is assumed to correspond to the g.s. of {+270}Db 
T$from one fission event and 2 |a decay events (2019Kh04) 
$observed alpha energies of the two chains are E|a=7890 {I30} and E|a=7900 {I30} (2019Kh04) 
%SF$from ratio of observed fission event to alpha events (2019Kh04) 


level_energy_unit: KEV
level_spin_parity: 0+
level_lifetime_unit: MS
level_comment:
$Only the SF decay mode was observed by 2009Fo02 and 1997He29. No |a decay was observed, with an upper limit of 20% in both 2009Fo02 and 1997He29. 
T$weighted average of 2.1 ms {I+10-6} (2009Fo02), 2.9 ms {I+13-7} (1997He29, also 1999He11) and 2.7 ms {I+9-7} (quoted by 2009Fo02 from Ph.D. thesis by J.B. Patin, University of California, Berkeley (2002)). Note that 2009Fo02 and J.B. Patin's thesis work are from the same laboratory (LBNL), but these are results from independent experiments using two different reactions to produce the activities: {+208}Pb({+52}Cr,2n){+258}Sg in 2009Fo02 and {+209}Bi({+51}V,2n){+258}Sg in J.B. Patin's thesis 
$Partial |a decay half-life was calculated from semi-empirical formula by 1997Po18 as T{-1/2}(|a)=1.6 ms and by 1995KoZL as 20 ms. E|a=10310 keV and E|a=9590 keV were used by 1997Po18 and 1995KoZL, respectively. Q(|a)=9620, recommended by 2017Wa10, gives E|a=9470 keV. 
$Partial half-lives for |e decay and for SF decay were also calculated by 1995KoZL as T{-1/2}(|e)=10 s, T{-1/2}(SF)=4 ms. The calculated partial half-lives of 1995KoZL suggest %SF=87, %|a=13, %|e=0.17. 
$Production |s=0.04 nb {I+10-4} at E({+52}Cr)=260.0 MeV, with one event; 0.15 nb {I+7-6} at E({+52}Cr)=266.2 MeV, with eight events (2009Fo02) 


level_energy_unit: KEV
level_lifetime_unit: S
level_comment:
J Analogy with {+249}Cm and {+251}Cf (N=153 nuclei) suggests 1/2+ 1/2[620] Nilsson single-particle state for {+259}Sg g.s. However, a calculated energy (theory,1994Cw02) for the 11/2- 11/2[725] Nilsson single-particle state suggests this state as the g.s. in {+259}Sg. 
T Weighted average of T{-1/2}=0.32 s {I+8-6} (2009Fo02) and 0.28 s {I5} (2009He20). Other value: 0.48 s {I+28-13} (1985Mu11). 
%A$From 1985Mu11, 2009Fo02. Other: |?100 (1984De07). Other value: |?96% (2009Fo02). 
%SF$From 1985Mu11, 2000Ho27. Calculated T{-1/2}(SF)|?10 s (1988Lo03) 
%EC$From 2009Fo02. 
Deduced from Q(|b{+-})values: T{-1/2}(|a)=0.6 s, T{-1/2}(|e+|b{++})=7 s, T{-1/2}(SF)=80 s (1995KoZL) 


level_energy_unit: KEV
level_lifetime_unit: S
level_comment:
For J|p assignment see Adopted Levels. 
T$ measured in 2009Fo02 from |a decay of 25 decay chains 
$|s=0.23 nb {I+14-10} at E=254.0 MeV, with 6 events. 
$|s=0.32 nb {I+11-10}, combined for E=257.8,256.9 MeV, with 16 events 
$ E|a=9593 {I46} from 14 events. Remaining |a energies were in the 9.00-9.47 MeV range. For a complete |a spectrum, consult authors' submission as Electronic Physics Auxiliary Publication Service (EPAPS), American Institute of Physics, http://www.aip.org/pubservs/epaps.html, EPAPS document. 


level_energy_unit: KEV
level_spin_parity: 0+
level_lifetime_unit: MS
level_comment:
$T{-1/2}({+260}Sg)=3.6 ms {I+9-6} was obtained by 1985Mu11 from |a counts; T{-1/2}=2.5 ms {I15} was deduced by 1984De07 from fission counts (T{-1/2}(SF)=6 ms {I+2-1} was measured from SF activities, and the time distribution of fission fragments were utilized in calculation of the half-life by subtracting the SF activities of {+256}Rf, the |a daughter; %|a>80 was assumed). T{-1/2}({+260}Sg)=3.6 ms {I9} is adopted. 
$%|a=50 {I+20-30} was obtained by 1985Mu11. Other measurements: %|a|>80 (1984De07,1984Og03). 
$By requiring the |a hindrance factor for the observed 9770-keV |a transition to the {+256}Rf g.s. to be 1.0, r{-0}({+256}Rf)=1.486 is calculated, if the |a branching is 50% and I|a(9770|a)=83 per 100 |a decays. This r{-0} is much larger than the expected value of 1.465 {I20} from the trend of r{-0}'s given in 1998Ak04. 
$Calculations using r{-0}({+256}Rf)=1.465 {I20} yield T{-1/2}(|a)=12 ms {I+6-5} which corresponds to %|a=30 {I+20-10}. 
$The theoretical calculations of 1997Mo25 give T{-1/2}(|a)=7.08 ms; by semiempirical formula, 1997Po18 calculated T{-1/2}(|a)=9 ms; 1995KoZL calculated T{-1/2}(|a)=6 ms. 
$The partial half-life for spontaneous fission was calculated by 1993Sm03, 1989St20, 1987Mo16, 1985Lo17 and 1978Po09. 
$The partial |b half-life was calculated by 1997Mo25 as 22.0 s. This calculated |b half-life predicts %|b{++}=0.016. 


level_energy_unit: KEV
level_lifetime_unit: S
level_comment:
T from 0.26 s {I+11-6} (1985Mu11,1984Mu17) and 0.11 s {I+14-4} (1987Mu15) 
%A only |a decay observed (1985Mu11) 
%SF from 1999He11; no unambiguous indication for SF found (1999He11). Other: <10 (1985Mu11), <50 (1984Og03) 
Calculated: T{-1/2}(|a)=0.5 s, T{-1/2}(|e+|b{++})=32 s (1997Mo25); T{-1/2}(|a)=0.2 s, T{-1/2}(|e+|b{++})=30 s, T{-1/2}(SF)=50 s (1995KoZL); T{-1/2}(SF)|?1 s (1988Lo03) 
Both {+265}Hs isomers seem to feed the g.s. of {+261}Sg. No significant difference is observed between the E|a and T{-1/2} of the daughter, {+261}Sg, from the decay of either {+265}Hs isomer (1999He11). 


level_energy_unit: KEV
level_energy_info: ;ERR=AP;ERR=?
level_spin_parity: (11/2-)
level_lifetime_unit: US
level_lifetime_info: ;ISO=M
level_comment:
E$ from energy distribution of electron bursts 
T$ from time difference between recoil implants and the subsequent electron burst. Maximum likelihood method with an exponential decay was used in the fitting procedure (2010Be16) 
$Possible configuration=|n11/2[725] (2010Be16) as deduced from Weisskopf estimates. Most likely scenario of the decay of this isomer is to 9/2+ and 11/2+ members of the rotational band built on |n7/2[613] state, assuming 7/2[613] is lower in energy than 11/2[725] 


level_energy_unit: KEV
level_spin_parity: 0+
level_lifetime_unit: MS
level_comment:
T measured by 2001Ho06. 
Only SF branch was detected. From non-observation of |a's upper limit of 22% for |a decay branch was set by 2001Ho06. 


level_energy_unit: KEV
level_lifetime_unit: S
level_comment:
T from 1.1 s {I+28-6} (1994Gr08), 0.9 s {I2} (1974Gh04) 
%A only |a decay observed (1974Gh04) 
%SF <30, no SF detected following {+267}Hs |a decay (1995La20). T{-1/2}(SF)=0.64 s {I+32-18} from analysis of fragment tracks, %SF|?70 from cross section comparisons (1979Dr07) 
Calculated: T{-1/2}(|a)=2 s, T{-1/2}(|e+|b{++})=60 s, T{-1/2}(SF)=20 s, deduced from Q values (1995KoZL); T{-1/2}(|a)|?0.1 s (1990Ha26); T{-1/2}(SF)|?400 s, T{-1/2}(|a)|?30 s (1988Lo03) 


level_energy_unit: KEV
level_energy_info: ;OFF=Y
level_lifetime_unit: S
level_lifetime_info: ;ERR=?;ISO=M
level_comment:
Reported as a member of |a chain from {+271}110 (1997Ho03,1997Ho13). 1997Au04 cites T{-1/2}=0.36 s {I13} from an earlier report by same authors. 
Parent of 1.7 s E|a=8.88 MeV {+259}Rf (1997Ho03,1997Ho13). 


level_energy_unit: KEV
level_spin_parity: 0+
level_lifetime_unit: MS
level_comment:
E$ assumed as the ground state of even-even nucleus 
$ No |a decay was observed (2006Gr24), only an upper limit is assigned 
T$ SF decay half-life (2006Gr24) determined from analysis of five events assigned to SF decay. Other: 120 ms {I+126-44} (2006Ni10, from three SF events). The value from 2006Gr24 is adopted here due to somewhat better statistics and from consistency with the systematic trend of measured partial fission half-lives for even-even Sg isotopes, as shown by 2006Gr24 in their figure 3. The half-life from 2006Ni10 will be an outlier in this figure. Partial |a decay half-life>100 ms based on %|a<36 (2006Gr24). 
T$ calculations for |a, |e and SF decays: 1978Po09, 1985Lo17, 1987Mo16, 1989Mo03, 1989St20, 1995KoZL, 1997Mo25, 1997Po18, 2001Mu11, 2005Xu01 
$ Cross section for production=9 pb {I+6-4} (2006Gr24) at excitation energy of the compound nucleus=39.3 MeV; 10 pb {I+10-6} (2006Ni10) at excitation energy of 40 MeV. 
$ Energy of evaporation residues=6.34 to 8.08 MeV; total energy of SF decay=120 to 234 MeV. 


level_energy_unit: KEV
level_energy_info: ;OFF=X
level_lifetime_unit: S
level_comment:
$%SF|<50 (68 % c.i.) derived from data by 2012Ha05. Other: %SF|<35 {I16} (1998Tu01); %|a|<65 {I16}; (2012Au07 for isomer from syst). 
E$8690 keV {I50} (Q(|a)=8823 keV {I50}) from 2012Ha05. 
$This level was labelled {+265}Sg{+a} by 2008Du09 and could Be the g.s. 
T$from 2012Ha05 (68% c.i.). ; other: 16.2 s {I+47-35} from 2008Du09 (68% c.i.) derived from 24 events in the energy group with E|a|<8.73 MeV. This corresponds to E|a=8685 keV {I190} (Q(|a)=8818 keV {I190}) as the weighted average (Normalised Residual Method) of 32 events, by evaluators. 2008Du09 point out that decays from {+269}Hs preferentially (91%) populate this level in {+265}Sg. Of the observed two levels, this may Be the g.s.; 19.4 s {I+58-36} from arithmetic mean |t=27.9 s of one event each from 1996Ho13, 1996La12, 2002Ho11, 2004Vo24, and 2006Ni10 and three events from 1997Sc49, three events from 2003Tu05, six events from 2006Dv01, and two events from 2007Mo09 (evaluators); 7.4 s {I+33-27} (1998Tu01, 1999Ar21) and 15 s {I+7-4} (2008Dv02). 
$T{-1/2}(SF)|>13 s (2000Ho27, based on 1998Tu01) 
$T{-1/2}(calc)=14 s from Viola-Seaborg systematics (for g.s) assuming Q(|a)=8.820 MeV (2012Ha05) 
J 1/2+ seems probable from systematics if this is the g.s. (evaluators). Also suggested are 9/2+ (1999Ar21, Nillson Model) and 3/2+ (2012Au07 for isomer from syst.) 
J$|W(n)=1/2+ from 1997Mo25. 
$|b{-2}(theory): 0.229 (1995Mo29); 0.247 (2003Mu26); 0.273 (2005GaZY) 


level_energy_unit: KEV
level_energy_info: ;OFF=X
level_lifetime_unit: S
level_lifetime_info: ;ISO=M1
level_comment:
$%SF|<51 (68 % c.i.) derived from data by 2012Ha05. 
T$from 2012Ha05 (68% c.i.). ; other:8.9 s {I+27-19} (2008Du09, 68% c.i.) 
$T{-1/2}(calc)=4.34 s from Viola-Seaborg systematics (for g.s.) assuming Q(|a)=8.980 MeV from 2012Ha05. 
E$8840 keV {I50} (Q(|a)=8976 keV {I50}) from 2012Ha05. 
$This level was labelled {+265}Sg{+b} by 2008Du09 derived from 20 events in the energy group E|a>8.73 MeV. Evaluators suggest E|a=8830 keV {I60} (Q(|a)=8965 keV {I60}) as the weighted average (Normalised Residual Method) of events 8 and 33 from 2008Du09; 9.2 s {I1}.6 (2012Au07 for ground state). 
J evaluators suggest J|p=9/2+ for an isomeric state based on decay systematics. 


level_energy_unit: KEV
level_spin_parity: 0+
level_lifetime_unit: S
level_comment:
$Only the SF decay mode observed by 2013Og03 (Dubna group), 2008Dv02 and 2006Dv01 (GSI group). See comment for T{-1/2} 
T$weighted average of 0.28 s {I+19-8} (2013Og03) and 0.36 s {I+25-10} (2008Dv02) for SF decay of {+266}Sg. In several earlier publications (2003Tu05, 2003Du27, 2002Du21, 2001Hu22, 1998Tu01, 1997Sc48, 1997Sc49 from the GSI group; and 1995Og02, 1994La22, 1994Lo27, 1994La22, 1994Og04 from the Dubna-LLNL group), |a decay mode was also reported, and the half-life for |a decay was reported as |?21 s, but 2006Dv01 reassigned the events observed in all the earlier studies listed above to {+265}Sg. 


level_energy_unit: KEV
level_spin_parity: 9/2
level_lifetime_unit: MIN
level_comment:
T$determined by combining present |a(t) data with data from literature (2024Og02) 
$observed alpha decay energy of E|a=8270 {I20} (2024Og02) is proposed by 2024Og02 to decay to a 9/2 excited state in {+263}Rf 


level_energy_unit: KEV
level_lifetime_unit: MS
level_comment:
$%SF+%|e<18 (2008Ne01) 
$Only |a decay of {+260}Bh has been observed by 2008Ne01. An upper limit is proposed by 2008Ne01 for SF and |e decay modes. Mainly the |a decay mode was also reported by 1983OgZX 
E$the 35-ms activity is assumed to belong to the g.s. of {+260}Bh. Seven |a events are observed at: 10.24, 10.17, 10.17, 10.08, 10.19, 10.13 and 10.03 MeV (2008Ne01), some of which possibly feed excited states in {+256}Db 
T$from (implants)|a-correlated events (2008Ne01). No half-life was reported by 1983OgZX. Theoretical calculations (1997Mo25) predict T{-1/2}=0.025 s for |a decay and 10.22 s for |e decay, consistent with dominant |a decay mode in experimental works of 2008Ne01 and 1983OgZX 
J$in theoretical calculations by 1997Mo25, 5/2- proton and 11/2- neutron orbitals were specified, which would suggest J|p=3 to 8 with positive parity 
$No direct SF decay of {+260}Bh or from {+260}Sg (possible |e decay of {+260}Bh) was observed. Only a limit of <18% is assigned at 84% confidence level for SF and |e decay branches. 
T$from 2008Ne01. 
$Production cross section=59 pb {I+29-20} (2008Ne01) 
$Fission barrier height was calculated by 1985Cw01 as 6.4 MeV. For calculated deformation energy along the fission barrier as a function of quadrupole deformation, see 1985Cw01. 


level_energy_unit: KEV
level_lifetime_unit: MS
level_comment:
T from 11.8 ms {I+53-28} (1989Mu09). Others: 6.1 ms {I+43-18} (1986MuZX), 9.0 ms {I+44-23} (1988MuZX) 
%SF SF not observed. %SF<10 (1989Mu09). Calculated T{-1/2}(SF)|?1|*10{+2} s (1988Lo03) 
Calculated: T{-1/2}(|e+|b{++})=13 s, T{-1/2}(|a)=8 ms (1997Mo25) 


level_energy_unit: KEV
level_lifetime_unit: MS
level_comment:
T$ from seven decay events (2008Ne08) 
$ |s=67 pb {I+65-36} at 272.3 MeV; 28 pb {I+65-23} at 268.4 MeV; 8 pb {I+18-7} at 264.7 MeV {+54}Cr beam 
$ |s=43 pb {I+57-28} at 273.0 MeV {+55}Mn beam 


level_energy_unit: KEV
level_spin_parity: (5/2-)
level_lifetime_unit: MS
level_comment:
T$ from 18 decay events (2010He11) 
$ |s=64 pb {I15} (2010He11) 
J$ from 2010He11, possible 5/2[512] 


level_energy_unit: KEV
level_energy_info: ;OFF=X
level_lifetime_unit: MS
level_comment:
T measured by 1989Mu09. Authors' earlier measurements: 115 ms {I+231-75} (1981Mu06), 56 ms {I+53-18} (1986MuZX), 106 ms {I30} (1988Mu15). 
Level is populated in 266Mt |a decay: the authors of 1997Ho14 observed that the 10682-, 10809- and 10848- keV |a's from 266Mt were correlated with the 9731-, 9831- and 10143- keV |a's from {+262}Bh, and pointed out that the three correlated |a's of 266Mt possibly decay from different 266Mt isomers. 
1989Mu09 stated that there is no convincing evidence, but |a correlations might suggest that the 102-ms state is the g.s. The |a energy of E|a=10060, measured by 1989Mu09, yields Q(|a)({+262}Bh)=10216 {I40}+E({+258}Db level fed by 10060a)-E(102-ms {+262}Bh level); the Q(|a) calculated from E|a=10143 of 1997Ho14 is Q(|a)({+262}Bh)=10300+E({+258}Db level fed by 10143a)-E(102-ms {+262}Bh level). Q(|a)({+262}Bh)=10216 {I152} was recommended by 1995Au04 from E|a given by 1989Mu09 which is consistent with the Q(|a) systematics shown by 1993Au05. The Q(|a) deduced from measured E|a and the Q(|a) systematics suggest therefore, that energies of the parent and the daughter levels are close in values, and either of these levels may possibly Be the ground state: E(102-ms {+262}Bh parent)-E({+258}Db level fed by 10143a)=80 {I160}. As pointed out by 1989Mu09,there is no determining evidence. 
Only |a decay from this state in {+262}Bh was observed; no SF decay was detected by 1984Og03 and 1989Mu09. An upper limit of 20% was set by 1986MuZX. See also 1984Og03. 


level_energy_unit: KEV
level_energy_info: ;OFF=Y
level_lifetime_unit: MS
level_lifetime_info: ;ISO=M1
level_comment:
T measured by 1989Mu09. Earlier measurements: 1981Mu06, 1986MuZX, 1988Mu15. 
One photon at 382.9 in coincidence with an escape-|a from this state was observed by 1984Mu07, and because of the short correlation time between the 266Mt |a decay and the |a escape, 1989Mu09 suggested that the 8.0-ms state is probably the isomer. However, the 382.9|g has been tentatively reassigned to {+258}Db decay (private communication from S. Hofmann; March 2000). 
E the measured E|a=10443 decaying from this level yields Q(|a)({+262}Bh)=10605+E(level fed by 10443a)-E(8.0-ms level). If Q(|a)({+262}Bh)=10216 {I152} (1995Au04), then E(8.0-ms level)-E(level fed by 10443a)=390 {I160}. 
No SF decay was detected by 1989Mu09. An upper limit of 10% was given by 1989Mu09 for SF activities with T{-1/2}<100 ms. Other measurements: 1984Og03, 1986MuZX. 


level_energy_unit: KEV
level_lifetime_unit: MS
level_comment:
T$ from ten decay events (2008Ne08) 
$ |s=36 pb {I+82-30} at 268.4 MeV; 60 pb {I+35-24} at 264.7 MeV; 0.44 nb {I+43-24} at 260.9 MeV; 0.26 nb {I+20-12} at 257.1 MeV {+54}Cr beam 
$ |s=30 pb {I+68-24} at 283.0 MeV {+55}Mn beam 


level_energy_unit: KEV
level_uncertain: S
level_comment:
{+263}Bh has not been observed 
Calculated: T{-1/2}(|e+|b{++})|?30 s, T{-1/2}(|a)|?1 s (1997Mo25); T{-1/2}(|a)|?1|*10{+-2} s (1990Ha26); T{-1/2}(SF)|?1|*10{+3} s, T{-1/2}(|a)|?1 s (1988Lo03) 


level_energy_unit: KEV
level_lifetime_unit: S
level_comment:
T from |a's observed at various times, 1995Ho04 obtained T{-1/2}(9475|a)=98 ms, T{-1/2}(9619|a)=334 ms and T{-1/2}(9619|a)=1452 ms, all assigned to g.s. decay. In their summary table, T{-1/2}({+264}Bh)=440 {I+600-160} ms is given. 
$The partial half-lives for |a and |b decays were calculated by 1997Mo25 as 1.23 s and 10.99 s, respectively. 
$Partial half-life for spontaneous fission was calculated by 1985Lo17: the result was shown on their plot as log T{-1/2}(SF)|?-9 in years. 
%A only the |a decay of {+264}Bh was observed. 
$The calculated T{-1/2}(SF)|?{ 0.032 s} by 1985Lo17 predicts spontaneous fission to be the dominant mode of decay. 


level_energy_unit: KEV
level_uncertain: S
level_comment:
{+265}Bh has not been observed 
Calculated: T{-1/2}(|a)|?0.3 s (1990Ha26); T{-1/2}(|a)|?1|*10{+2}, T{-1/2}(SF)|?1|*10{+6} (1988Lo03) 


level_energy_unit: KEV
level_lifetime_unit: S
level_comment:
J$2-,3- from |W(proton)=5/2-, |W(neutron)=1/2+ (2019Mo01,theory) 
T$from mean lifetime=3.0 s {I+42-11} (2015Mo25 review article, analysis of three correlated decay chains observed in 2004Mo42, 2007Mo43 and 2012Mo25 at RIKEN). Others: 0.66 s {I+59-26} (2006Qi03), |?1 s in Fig. 1 and 1 to 10 s in the text (2000Wi15), 0.6 s {I+29-3} (deduced by 2004Mo42, from 0.87 s in Table I of 2000Wi15, interpreted by 2004Mo42 as decay time of {+266}Bh) 
$E|a=9.08 MeV {I4} (2004Mo42), 9.77 MeV {I4} (2007Mo43), 9.39 MeV {I6} (2012Mo25), 9.03 MeV {I8} (2006Qi03), 9.29 MeV (2000Wi15) from |a decay of {+266}Bh. Unweighted average of the first four values is 9.32 MeV {I17} (evaluator). 


level_energy_unit: KEV
level_lifetime_unit: S
level_comment:
T$from average decay times of 23 events with 68% confidence interval (2020Ha27). Authors also consider the wide spread in measured |a energies and give T{-1/2}=11.8 s {I+39-23} for E|a < 9.1 MeV (16 events) and T{-1/2}=6.1 s {I+36-16} for E|a |> 9.1 MeV (7 events). 
E$assuming the observed events correspond to the ground state. 2020Ha27 also explore the possibility of an isomeric state in {+266}Bh, see comment on T{-1/2}. 
%A$only |a decay has been observed 
$observed |a energies range from 8.62 to 9.40 MeV, consistent with fragmented |a decay strength for an odd-odd nucleus (2020Ha27). 
$production cross section for {+266}Bh was determined as |s=29 pb {I+28-16}, 57 pb {I14}, and 16 pb {I+21-10} for E({+23}Na)=125.9, 130.6, and 135.3 MeV, respectively (2020Ha27). 


level_energy_unit: KEV
level_lifetime_unit: MIN
level_comment:
%A$only |a decay observed 
E$the observed |a activity is assumed to correspond to the ground state of {+270}Bh 
J$6+,7+ from |W(proton)=1/2-, |W(neutron)=13/2- (1997Mo25,theory) 
T$61 s {I+292-28} (2017Og01 and 2015Og05 reviews) from one event in 2007Og02. 
$E|a=8.93 MeV {I8} from {+270}Bh |a decay (2017Og01 and 2015Og05 reviews) based on data in 2007Og02 


level_energy_unit: KEV
level_lifetime_unit: S
level_comment:
$Only the |a decay mode has been observed. 
E$The observed activity is assumed to correspond to the ground state of {+272}Bh, as seems suggested in level-scheme Fig. 3 of 2013Ru11. 
J$1-,2- from |W(proton)=1/2-, |W(neutron)=3/2+ (1997Mo25, theory) 
T$from 2016Fo10, based on detailed statistical analysis of 96 observed correlated events, starting from {+288}Mc, in three laboratories (FLNR-JINR-Dubna, GSI and Berkeley). Others: 10.6 s {I+16-11} (2017Og01 review; 10.9 s {I+20-15} 2015Og05 review). Measurements: 9.8 s {I+117-35} (2004Og03,2005Og02,2011Og07 from three correlated events); 10.9 s {I+21-15} (2013Ru11,2015Ru11 from all the known decay chains); 12.0 s {I+31-21} (2013Og01, update of 8.2 s {I+25-16} in 2012Og02) 
$E|a=8.55 to 9.20 MeV (2017Og01); 8.55-9.15 MeV (2015Og05); 8.73 to 9.15 MeV, 9.21 MeV {I1} (2013Ru11); 9.07 MeV and 8.93 MeV (2015Ru11); 9.02 MeV {I6} (2004Og03,2011Og07), from {+272}Bh |a decay 


level_energy_unit: KEV
level_uncertain: ?
level_comment:
E$226.2 keV if the ordering of 136|g-166|g cascade is reversed. Ordering of the two |g rays is not established. 


level_energy_unit: KEV
level_lifetime_unit: S
level_comment:
$Only the |a decay has been observed in the present experiment and several previous experiments. 
E$it is assumed that the observed activity corresponds to the ground state of {+272}Bh 
$E|a=8.29 to 9.21 MeV (2022Og07) 
T$from (Er)(|a)-correlated decays in the present experiment (2022Og07); authors give 9.2 s {I+9-8} from analysis of 55 events observed in the present experiment, and (96 or 113 events) observed in previous experiments (at DGFRS-JINR, GSI and LBNL). Other: 10.5 s {I+15-11} in {+272}Bh Adopted Levels in the ENSDF database (Jan 2019 update), where value was adopted from 2016Fo10 (Nucl. Phys. A953, 117). 


level_energy_unit: KEV
level_lifetime_unit: S
level_comment:
$Only the |a decay mode observed. 
E$the observed |a activity is assumed to correspond to the ground state of {+274}Bh 
J$1-,2- from |W(proton)=1/2-, |W(neutron)=3/2+ (1997Mo25,theory) 
T$from 2017Og01 and 2015Og05 reviews. Measurements: 53 s {I+250-24} (2010Og01,2011Og04); 54 s {I+65-19} (2013Og04, 2012Og06, from three events out of a total of four observed); 30 s {I+54-12} (2014Kh04, also 42 s {I+34-13} by combining their data with those from 2013Og04). 
$E|a=8.73-8.84 MeV (2017Og01 and 2015Og05 reviews) from |a decay of {+274}Bh. Measurements: 8.80 MeV {I10} (2010Og01,2011Og04); 8760 {I50} (2012Og06,2013Og04, from a total of four events); 8.84 MeV {I3} (2014Kh04) 


level_energy_unit: KEV
level_lifetime_unit: MIN
level_uncertain: ?
level_comment:
E$the reported activity is assumed to belong to the g.s. of {+278}Bh 
T$from 690 s {I+3300-310} listed in 2016Ho09 review. 


level_energy_unit: KEV
level_comment:
Calculated: T{-1/2}(|e+|b{++})|?5 s, T{-1/2}(|a)|?4|*10{+-3} s (1997Mo25); T{-1/2}(|a)|?5E-4s (1990Ha26); T{-1/2}(|a)|?0.03 s, T{-1/2}(SF)|?30 s (1988Lo03) 


level_energy_unit: KEV
level_lifetime_unit: MS
level_comment:
E$ the activity produced in this experiment is assumed to correspond to the g.s. of {+263}Hs. 
T$ from 2009Dr02. It is not stated by 2009Dr02 which events were used in determining half-life (compilers' note) 
$ The |a group of 10.89 MeV is assumed to be a transition from {+263}Hs g.s. to {+259}Sg g.s. The 10.57 MeV and 10.72 MeV |a groups either populate excited states in {+259}Sg 
$ Production |s=21 pb {+13-9} at 276.4 MeV center-of-target lab frame energy (2009Dr02) (from six events) 


level_energy_unit: KEV
level_spin_parity: 0+
level_lifetime_unit: MS
level_lifetime_info: ;ERR=AP
level_comment:
$From observation of fission activities of granddaughter {+256}Rf, the authors of 1984Og03 and 1986Mu10 had concluded that predominant decay mode of {+264}Hs g.s. is |a decay. From recent observation of short-lived spontaneous fission activities, 1998HoZV deduced that |a and SF branchings are 50%, if both activities are from the {+264}Hs g.s., although an isomeric state could not be ruled out (1998HoZV). 
T the measured half-lives for {+264}Hs are 76 |ms {I+364-36} (in {+207}Pb(5.04-MeV/u {+58}Fe), |a observed; 1987Mu 15), 66 |ms {I+316-30} (in {+208}Pb(5.019-MeV/u {+58}Fe), SF observed; 1998H oZV), 76 |ms {I+364-36} (in {+207}Pb(4.889 MeV/u {+58}Fe), SF observed; 1998H oZV), 825 |ms {I+3951-377} (in {+207}Pb(4.889 MeV/u {+58}Fe), |a observed; 1998HoZV). 1998HoZV recommend T{-1/2}=261 |ms, an average of these measurements. 
$T{-1/2}|?0.8 ms from the latest measurement by |a detection is adopted here because of the possibility of observation of a SF-decaying isomer. 
$Theoretical calculations of 1997Mo25 predict T{-1/2}(|a)=0.66 ms, and T{-1/2}(|b)=6.88 s. From semiempirical formulas, 1997Po18 calculated T{-1/2}(|a)=0.1 ms. 
$Our calculations by requiring the hindrance factor for the observed 10434-keV |a (from {+264}Hs g.s. to {+260}Sg g.s.) to be 1.0 and r{-0}({+260}Sg)=1.46 {I2}, extrapolated from r{-0} systematics given in 1998Ak04, give T{-1/2}(10434 |a)=1.3 ms {I5}. If I|a(10434 |a)=80|+20 per 100 |a decays, then the partial half-life for |a decay is expected to be 1.6 ms {I7}, or the total half-life to be |?0.8 ms, if %|a|?50. 
$For calculations of partial SF half-lives, see 1978Po09, 1985Lo17 and 1987Mo16. 
$For calculations of partial half-life and decay |G for pion radioactivity, see 1988Io02 and 1988Io04. 
$For calculations of quadrupole deformation, see 1997Ru04. 


level_energy_unit: KEV
level_lifetime_unit: MS
level_comment:
T from 1999He11; others: 1.55 ms {I20} (1995Ho03), 1.8 ms {I+22-7} (1987Mu15) 
No SF observed, no evidence for |b decay found (1987Mu15). No SF observed (1984Og03,1984Og02). 
%SF from 1999He11. 
Calculated: T{-1/2}(|a)|?8.5|*10{+-2}, T{-1/2}(|e+|b{++})|?3 s (1997Mo25); T{-1/2}(|a)|?3|*10{+-3} s (1990Ha26); T{-1/2}(|a)|?1 s, T{-1/2}(SF)|?1|*10{+4} s (1988Lo03) 


level_energy_unit: KEV
level_energy_info: ;ERR=GE;ERR=?
level_lifetime_unit: MS
level_lifetime_info: ;ISO=M
level_comment:
E(level)=303 {I22} (from E|a of 1999He11) if the highest energy |a groups of both {+265}Hs isomers feed the g.s. of {+261}Sg. 
T from 1999He11 


level_energy_unit: KEV
level_spin_parity: 0+
level_lifetime_unit: MS
level_comment:
$SF branch from a larger number of decay chains observed in 2012Ac04, but complete analysis of these results is not available as yet. Other: fission branch estimated as within 1.4% in the absence of observed SF for this nucleus (2001Ho06). 
E$the observed |a activity is assumed to correspond to the ground state of {+266}Hs 
T$from 2012Ac04, which probably includes data from 25 decay chains observed in this work, details of which have not been published as yet, and also the eight events from the previous GSI work (2001Ho06). Other: 2.3 ms {I+13-4} (2001Ho06). 


level_energy_unit: KEV
level_energy_info: ;ERR=AP;ERR=?
level_lifetime_unit: S
level_lifetime_info: ;ISO=M
level_comment:
E$from 2017Ac02 and 2015Ac04 review articles. Others: 1100 keV {I90} (2021Ko07, NUBASE-2020), 1404 keV {I97} (2015Ko14, K-isomer evaluation) 
J$9- proposed from systematics (2021Ko07,2015Ko14) with possible configuration=|n7/2[613]~#|n11/2[725] in 2015Ko14 
T$74 ms {I+354-34} (2012Ac04). Note: units corrected from s in the 2019 ENSDF update (and 2019Si12) to ms in the present update. 


level_energy_unit: KEV
level_energy_info: ;ERR=AP;ERR=?
level_lifetime_unit: S
level_lifetime_info: ;ISO=M
level_comment:
E$from 2017Ac02 and 2015Ac04 review articles. 
T$74 ms {I+354-34} from 2012Ac04. Note: units corrected from s in the 2019 ENSDF update (and 2019Si12) to ms in the present update. 


level_energy_unit: KEV
level_spin_parity: 0+
level_lifetime_unit: S
level_comment:
$Only the |a decay mode has been observed. 
E$the reported activity is assumed to belong to the g.s. of {+268}Hs 
T$0.38 s {I+180-17} from one |a-SF correlated decay chain in 2010Ni14. {+268}Hs decays by E|a=9479 keV {I16} followed by the SF decay of daughter nucleus {+264}Sg. The SF events were in coincidence with 749|g 
$Production |s=0.54 pb {I+130-45} (2010Ni14) 


level_energy_unit: KEV
level_spin_parity: 0+
level_lifetime_unit: S
level_comment:
E$the observed |a activity is assumed to correspond to the ground state of {+270}Hs 
T$|a-decay half-life (2013Og03,2011Og07) from six correlated events. Other: 7.6 s {I+52-22} (2012Tu01, analysis of events from different studies). 
$Average production |s=16 pb {I+13-7} (2013Og03) at 41-MeV excitation energy 
$Production cross section (at E({+26}Mg)=136 MeV)=3 pb (2006Dv01) 
$Measured E|a=9020 {I80} (2013Og03) from |a decay of {+270}Hs. Other: 8.93 MeV {I10} (2012Tu01) 


level_energy_unit: KEV
level_spin_parity: 11/2
level_lifetime_unit: S
level_comment:
T$from |a(t) (2024Og02) 
$observed alpha decay energy of E|a=9340 {I20} (2024Og02) is proposed by 2024Og02 to decay to the 11/2 state in {+267}Sg 


level_energy_unit: KEV
level_energy_info: ;OFF=X
level_spin_parity: 3/2
level_lifetime_unit: S
level_comment:
T$from |a(t) (2024Og02) 
$observed alpha decay energy of E|a=9050 {I20} (2024Og02) is proposed by 2024Og02 to decay to the 3/2 state in {+267}Sg 


level_energy_unit: KEV
level_spin_parity: 0+
level_lifetime_unit: MIN
level_uncertain: ?
level_comment:
E$the reported activity is assumed to belong to the g.s. of {+278}Hs 
T$from 690 s {I+3300-310} listed in 2016Ho09 review. 


level_energy_unit: KEV
level_lifetime_unit: MS
level_comment:
$No evidence was found for |e or SF decay modes (2009Ne02,1997Ho14). The SF events detected in 1984Og03 were interpreted as being from {+258}Rf decay, the |e decay daughter of {+258}Sg, the |a grand-daughter of {+266}Mt. From the systematics of SF decay half-lives, 1984Og03 suggested that {+266}Mt decays mostly by |a. 
E$the observed SF or |a activity is assumed to correspond to the ground state of {+266}Mt, although, as stated in 1997Ho14 and 1999He11, isomeric activity is also possible 
T$weighted average of 3.3 ms {I+25-10} (2009Ne02, from five decay chains) and 1.7 ms {I+6-4} (1997Ho14, from 14 decay chains, including one each from 1988Mu15 and 1984Mu07). The half-life is assigned to one activity, but as stated in 1997Ho14 and 1999He11, isomeric activity is also possible 
J$1+,10+ from |W(proton)=11/2+, |W(neutron)=9/2+ (1997Mo25, theory) 
$E|a=11.26 and 10.67 MeV (2009Ne02), 10.484 to 11.739 MeV in 1997Ho14. From all the 15 decay chains, where full energy |a decay from {+266}Mt was recorded, unweighted average E|a=10.86 MeV {I10}. 2017Wa10 and 2017Hu03 adopt Q(|a)({+266}Mt decay)=10996 {I25} (implying E|a=10831 {I25}) by taking average of four measured E|a values 10859, 10848, 10809 and 10814 keV in 1997Ho14; and also adopt Q(|a)=11920 {I50} for an isomer in {+266}Mt from an event with measured E|a=11739 keV in 1997Ho14. However, note that the procedure adopted in 2017Hu03 is at variance with a comment by 1997Ho14 that events #5, #10 and #12 were correlated to three |a decays of {+266}Mt near 10.8 MeV, possibly decays from a level different from the other transitions. 
$Production |s=7.5 pb {I27} (maximum); |s(287.6 MeV)=7.4 pb {I+48-33}, |s(289.8 MeV)=6.1 pb {I+49-29}, and |s(292.0)=2.5 pb {I+25-14} (1997Ho14). Measured |s=7.7 pb {I+52-33} at E*=14.9 MeV (2009Ne02). Earlier value: |s=10 pb {I+10-6} (1988Mu15, also includes 1984Mu07). 


level_energy_unit: KEV
level_lifetime_unit: MS
level_comment:
$Only the |a decay mode has been observed. 
E$the reported activity is assumed to belong to the g.s. of {+268}Mt 
J$2017Au03 suggest 5+,6+ based on systematics. 5-,6- from |W(proton)=11/2-; |W(neutron)=1/2+ (1997Mo25, theory). 
T$from 2004Mo26 (unweighted average of all 14 events; t{-2}=30 ms). Others: 42 ms {I+29-12} (2002Ho11); 27 ms {I+8-5} from average t{-2}=38.2 ms (21 events. Evaluators). 2002Ho11 do not exclude the presence of isomeric states, for example 171 ms. 2004Mo26 tentatively assigned all of the decays to one state since the decay time distribution exhibited no clear peculiarities. 2004Mo26 note that 1995Ho04 observed one fairly long-lived |a-decay (171 ms) with an energy 0.16 MeV lower than the other two events. 2004Mo26 also observed a 122-ms event but the |a escaped. These two decays may indicate an isomeric state in {+268}Mt and, if excluded, the results of 2002Ho11 and 2004Mo26 are consistent within uncertainties. 
%A$21 |a-decay events observed in four experiments; no SF decay reported 


level_energy_unit: KEV
level_lifetime_unit: S
level_comment:
E$the observed |a activity is assumed to correspond to the ground state of {+270}Mt 
J$4+,7+ from |W(proton)=11/2+, |W(neutron)=3/2+ (1997Mo25, theory) 
T$from mean lifetime=0.69 s {I+95-26} (2015Mo25 review article, based on observation of three correlated decay chains in experiments at RIKEN: 2004Mo42, 2007Mo43 and 2012Mo25). 
$E|a=10.03 MeV {I7} (2004Mo42), 10.26 MeV {I7} (2012Mo25) from |a decay of {+270}Mt. Unweighted average=10.15 MeV {I11} (evaluator) 


level_energy_unit: KEV
level_lifetime_unit: S
level_comment:
$Only the |a decay mode observed with no SF events detected. 
E$the observed |a activity is assumed to correspond to the ground state of {+274}Mt 
J$4+,7+ from |W(proton)=11/2+, |W(neutron)=3/2+ (1997Mo25,theory) 
T$from 2017Og01 and 2015Og05 reviews, based on experimental data in 2007Og02 and 2013Og01 
$E|a=9.76 MeV {I10} or 10.0 MeV {I11} (2017Og01 and 2015Og05 reviews) from {+274}Mt |a decay, based on measurements in 2007Og02 and 2013Og01 


level_energy_unit: KEV
level_lifetime_unit: S
level_comment:
$Only the |a decay mode has been observed. 
E$The observed activity is assumed to correspond to the ground state of {+276}Mt, as seems suggested in level-scheme Fig. 3 of 2013Ru11. 
J$3+,8+ from |W(proton)=11/2+; |W(neutron)=5/2+ (1997Mo25, theory) 
T$from 2016Fo10, based on detailed statistical analysis of 96 observed correlated events, starting from {+288}Mc, in three laboratories (FLNR-JINR-Dubna, GSI and Berkeley). Others: 0.52 s {I10} (2017Og01 review; 0.45 s {I+12-9} 2015Og05, review). Measurements: 0.72 s {I+87-25} (2004Og03,2005Og02,2011Og07, from three correlated events); 0.70 s {I+13-9} (2013Ru11,2015Ru11 from all the known decay chains); 0.54 s {I+14-9} (2013Og01, update of 0.68 s {I+20-12} in 2012Og02) 
$E|a=8.52 to 10.01 MeV (2017Og01); 9.17-10.01 MeV (2015Og05); 9.17 to 9.95 MeV (2013Ru11); 9.53 MeV and 9.60 MeV (2015Ru11), 9.71 MeV {I6} (2004Og03,2011Og07), from {+276}Mt |a decay 


level_energy_unit: KEV
level_energy_info: ;OFF=X
level_lifetime_unit: S
level_lifetime_info: ;ISO=M
level_uncertain: ?
level_comment:
$Assignment of this isomer to {+276}Mt in 2012Og02 and 2013Og01 is based on a wide structure of the |a-decay curves, showing two peaks: 9.26 MeV {I64} and 9.81 MeV {I8}, the partial half-lives of the higher energy peak about 10 times higher than that for the rest of the decays. However, according to 2013Ru11, this isomer could be assigned to {+280}Rg or {+272}Bh 
T$from 2017Og01 review. Others: 6 s {I+5-3} (2015Og05 review); 6 s {I+8-2} (2012Og02,2013Og01) 


level_energy_unit: KEV
level_lifetime_unit: S
level_comment:
$Only the |a decay has been observed in the present experiment and several previous experiments. 
E$it is assumed that the observed activity corresponds to the ground state of {+276}Mt 
$E|a=8.52 to 10.01 MeV (2022Og07) 
T$from (Er)(|a)-correlated decays in the present experiment (2022Og07); authors give 0.59 s {I+6-5} from analysis of 55 events observed in the present experiment, and (96 or 113 events) observed in previous experiments (at DGFRS-JINR, GSI and LBNL). Other: 0.69 s {I+9-7} in {+276}Mt Adopted Levels in the ENSDF database (Jan 2019 update), where value was adopted from 2016Fo10 (Nucl. Phys. A953, 117). 


level_energy_unit: KEV
level_lifetime_unit: MS
level_comment:
T$from (Er)(|a)-correlated decays (2022Og07) in this experiment and all the previous experiment at DGFRS-JINR facility during 2011-2013. Other: 4 s {I+4-1} in {+277}Mt Adopted Levels in the ENSDF database (Sept 2021 update), where value was adopted from four events reported in DGFRS-JINR experiment in 2013 and GSI experiment in 2019. 


level_energy_unit: KEV
level_lifetime_unit: S
level_comment:
$Only the |a decay mode observed with no SF events detected. 
E$the observed |a activity is assumed to correspond to the ground state of {+278}Mt 
T$from 2017Og01 and 2015Og05 reviews. Measurements: 7.7 s {I+370-35} (2011Og04,2011Og07,2012OgZZ, from one decay chain); 5.2 s {I+62-18} (2012Og06,2013Og04,2013Og01, from three out of four decay chains observed); 3.6 s {I+65-14} (2014Kh04 from four decay chains, also report 4.4 s {I+36-14} by combining their data with those from 2013Og04) 
J$3-,6- from |W(proton)=9/2-, |W(neutron)=3/2+ (1997Mo25, theory) 
$E|a=9.38-9.55 MeV (2017Og01,2015Og05 reviews) from decay of {+278}Mt. Measured E|a=9.55 MeV {I19} (2010Og01,2011Og04,2011Og07,2012OgZZ); 9.38-9.55 MeV (2013Og04,2012Og06; from decay of {+278}Mt for three events out of a total of 4 events observed); 9.45 MeV {I3} (2014Kh04) 


level_energy_unit: KEV
level_lifetime_unit: MIN
level_uncertain: ?
level_comment:
E$the reported activity is assumed to belong to the g.s. of {+282}Mt 
T$from 67 s {I+320-30} listed in 2016Ho09 review. 
$E|a=8.83 MeV {I18} (2016Ho09 review) from {+282}Mt decay 


level_energy_unit: KEV
level_spin_parity: 0+
level_lifetime_unit: MS
level_comment:
$Only the |a decay observed. No fission branch observed. From theoretical calculations, 2001Ho06 estimated %SF<0.2 
E$the observed |a activity is assumed to correspond to the ground state of {+270}Ds 
T$from 2012Ac04. Other: 100 |ms {I+140-40} (2001Ho06, from the three events 1, 2 and 3 assigned to the {+270}Ds g.s.). 2011Ac01 mention experimental T{-1/2}(SF mode)>0.2 ms 
$E|a=11.03 MeV {I5} (2001Ho06) from {+270}Ds |a decay. Preliminary Q(|a)=11.25 MeV (2012Ac04), fully analyzed results of this work are not yet available 


level_energy_unit: KEV
level_energy_info: ;ERR=AP;ERR=?
level_spin_parity: (9-,10-)
level_lifetime_unit: MS
level_lifetime_info: ;ISO=M
level_comment:
E$from 2017Ac02 and 2015Ac04 review articles, based on the assumption that the observed 12.15-MeV |a in 2001Ho06 feeds a level in {+266}Hs very near the g.s. (2011Ac01,2012Ac04). Others: 1040 keV from Fig, 4 in 2012Ac04; 1390 keV {I60} (2017Au03, NUBASE-2016, from analysis of alpha energies); 1348 keV {I66} (2015Ko14, K-isomer evaluation) 
J$from 2011Ac01 and 2015Ac04, based on theoretical calculations, and interpretation as a high-spin K-isomer with configuration= |n11/2[725]~#|n7/2[613] for J|p=9- or |n11/2[725]~#|n9/2[615] for 10-. 2017Au03 and 2015Ko14 give (10-). 
T$from Fig. 4 in 2012Ac04 (somewhat preliminary value, but probably includes more decay chains, from their work as well as from 2001Ho06). Other: 6.0 ms {I+82-22} (2001Ho06, unweighted average for events 4, 5 and 6 attributed to the isomeric state). 
$E|a=10.95 MeV {I2}, 11.15 MeV {I2} and 12.15 MeV {I5} (2001Ho06) from |a decay of the isomer in {+270}Ds to three different levels in {+266}Hs. Other: E|a=10.97, 11.20 and 12.11 MeV (2012Ac04, preliminary values from Fig. 4 in 2012Ac04) 


level_energy_unit: KEV
level_lifetime_unit: MS
level_comment:
E$observed activity is assumed to correspond to the g.s. of {+270}Ds 
T$from |a(t) with 6 observed events (2024Og02) 
$observed alpha decay energy of E|a=11200 {I20} (2024Og02) is proposed by 2024Og02 to decay to a long-lived excited state in {+271}Hs 


level_energy_unit: KEV
level_spin_parity: 0+
level_lifetime_unit: MS
level_comment:
$E|a=10746 {I28} emitted by the decay of {+276}Ds (2023Og03), corresponding to Q(|a)=10904 keV {I28}, assuming g.s. to g.s. decay 
T$from (Er)(|a)- and (Er)(SF)-correlated decays (2023Og03) 
$Measured production cross sections in {+232}Th({+48}Ca,4n): 0.07 pb {I+17-6} at E({+48}Ca)=231.1 MeV, 0.7 pb {I+11-5} at E({+48}Ca)=237.8 MeV, and 0.11 pb {I+46-9} at E({+48}Ca)=250.6 MeV (2023Og03) 


level_energy_unit: KEV
level_lifetime_unit: S
level_comment:
E$Assumed ground state 
T$From 31 events. Note that this excludes the 4-second decay time in the reassigned chain from 2016Ho09. 


level_energy_unit: KEV
level_spin_parity: 0+
level_lifetime_unit: MIN
level_uncertain: ?
level_comment:
E$the reported activity is assumed to belong to the g.s. of {+282}Ds 
T$from 67 s {I+320-300} listed in 2016Ho09 review. 
$E|a=8.83 MeV {I18} (2016Ho09 review) from {+282}Ds decay 


level_energy_unit: KEV
level_lifetime_unit: MS
level_comment:
$Only the |a-decay mode observed in 21 decay chains from three different laboratories. 
E$the observed activity is assumed to correspond to the ground state of {+272}Rg, although assignment to an isomeric activity cannot be excluded 
J$3-,6- from |W(proton)=9/2-; |W(neutron)=3/2+ from 1997Mo25 (theory) 
T$from 14 events in 2004Mo26. Other: 1.6 ms {I+11-5} (from six events in 2002Ho11) 
$Average E|a=11045 keV {I35} (2004Mo26) in agreement with the average 11027 keV {I20} from 2002Ho11 for two redundant events. 


level_energy_unit: KEV
level_lifetime_unit: MS
level_comment:
$Only the |a decay mode observed with no SF events detected. 
E$the observed |a activity is assumed to correspond to the ground state of {+274}Rg 
J$5+,8+ from |W(proton)=3/2-, |W(neutron)=13/2- (1997Mo25,theory) 
T$from mean lifetime=18 ms {I+24-7} (2015Mo25 review article based on measurements in 2004Mo42, 2007Mo43 and 2012Mo25 at RIKEN) 
$E|a=11.15 MeV {I7} (2004Mo42), 11.31 MeV {I7} (2007Mo43), 10.65 MeV {I6} (2012Mo25) from |a decay of {+274}Rg. Average (unweighted) E|a=11.04 MeV {I20} (evaluator). 


level_energy_unit: KEV
level_lifetime_unit: MS
level_comment:
$Only the |a decay observed. 
E$the reported activity is assumed to belong to the g.s. of {+278}Rg 
J$1-,10- from |W(proton)=9/2-; |W(neutron)=11/2+ (1997Mo25,theory) 
T$from 2017Og01 and 2015Og05 reviews, based on data for two events in 2007Og02 and 2013Og01. 
$E|a=10.69 MeV {I8} (2017Og01 and 2015Og05 reviews) from decay of {+278}Rg 


level_energy_unit: KEV
level_lifetime_unit: S
level_comment:
$Only the |a decay mode has been observed. 
E$The observed activity is assumed to correspond to the ground state of {+280}Rg, as seems suggested in level-scheme Fig. 3 of 2013Ru11. 
J$1-,14- from |W(proton)=13/2+, |W(neutron)=15/2- (1997Mo25, theory) 
T$from 2016Fo10, based on detailed statistical analysis of 96 observed correlated events, starting from {+288}Mc, in three laboratories (FLNR-JINR-Dubna, GSI and Berkeley). Others: 4.2 s {I+6-4} (2017Og01 review); 4.3 s {I+5-4} (2016Fo10, from analysis of 109 decay chains by including the short chains as described by the authors; also 4.27 s {I+49-50} from analysis of 97 chains and 4.67 s {I+54-44} from analysis of 98 chains); 4.6 s {I+8-7} (2015Og05, review). Measurements: 3.6 s {I+43-13} (2004Og03,2005Og02,2011Og07 from three correlated events); 4.8 s {I+8-6} (2013Ru11,2015Ru11, from all the known decay chains at the time); 3.61 s {I+90-60} (2013Og01, update of 3.53 s {I+99-63} in 2012Og02); 6.8 s {I+32-16}, 3.0 s {I+15-7} (2016Fo10, from correlated decay times using different combinations of data for 14 short decay chains in their work and from previous Dubna and Berkeley groups). 
$E|a=9.09 to 10.07 MeV (2017Og01 review, 9.09-9.92 MeV in 2015Og05 review); 9.76 MeV {I1} (2016Fo10); 9.77 MeV {I1} for one of the events, ranges from (2013Ru11,2015Ru11); 9.75 MeV {I6} (2004Og03,2011Og07), from {+280}Rg decay to an excited state in {+276}Mt, according to 2013Ru11. 


level_energy_unit: KEV
level_lifetime_unit: S
level_comment:
$Only the |a decay has been observed in the present experiment and several previous experiments. 
E$it is assumed that the observed activity corresponds to the ground state of {+280}Rg 
$E|a=9.09 to 10.07 MeV (2022Og07) 
T$from (Er)(|a)-correlated decays in the present experiment (2022Og07); authors give 3.9 s {I+4-3} from analysis of 55 events observed in the present experiment, and (96 or 113 events) observed in previous experiments (at DGFRS-JINR, GSI and LBNL). Other: 4.4 s {I+5-4} in {+280}Rg Adopted Levels in the ENSDF database (Jan 2019 update), where value was adopted from 2016Fo10 (Nucl. Phys. A953, 117). 


level_energy_unit: KEV
level_lifetime_unit: S
level_comment:
$2017Og01: Physica Scripta 92, 023003 (2017). 
$E|a=9.28 to 9.34 MeV (2022Og07) 
T$from (Er)(|a)-correlated decays (2022Og07) in this experiment and all the previous experiment at DGFRS-JINR facility during 2011-2013. Other: 15 s {I+4-3} in {+281}Rg Adopted Levels in the ENSDF database (Sept 2021 update), where value was adopted from 21 events reported in DGFRS-JINR experiments in 2011-2013. 


level_energy_unit: KEV
level_lifetime_unit: S
level_comment:
$Only the |a-decay mode has been observed. 
E$the reported activity is assumed to belong to the g.s. of {+282}Rg 
J$5+,8+ from |W(proton)=13/2+, |W(neutron)=3/2+ (1997Mo25, theory) 
T$from 2017Og01 and 2015Og05 reviews. Other: 0.51 s {I+250-23} (2011Og07 review, from one event, this value seems erroneous); 3.1 min {I+57-12} (2014Kh04); 59 s {I+55-19} (2013Og04) 
$E|a=8.86-9.05 MeV (Q(|a)=9.16 MeV {I3}) from decay of {+282}Rg decay (2017Og01 and 2015Og05 reviews); 9.00 MeV {I10} (2011Og07 review, also 2010Og01 measurement). Measured E|a=9.05 MeV {I3} and 8.86 MeV {I3} (2014Kh04); 9.01 MeV {I5} (2013Og04) 


level_energy_unit: KEV
level_lifetime_unit: MIN
level_uncertain: ?
level_comment:
E$the reported activity is assumed to belong to the g.s. of {+286}Rg 
T$from 640 s {I+3100-300} listed in 2016Ho09 review. 
$E|a=8.670 MeV {I45} (2016Ho09 review) from {+286}Rg decay 


level_energy_unit: KEV
level_spin_parity: 0+
level_lifetime_unit: MS
level_comment:
$Only the SF decay seen in all the 16 observed decay chains 
E$the reported activity is assumed to belong to the g.s. of {+282}Cn 
T$from 2016Ho09 review, based on analysis of 14 events. Others: 0.91 ms {I+33-19} (2017Og01 and 2015Og05 reviews); 0.82 ms {I+30-18} (2011Og07, 2012Og06, 2006Og05, based on analysis of 12 events); 0.50 ms {I+33-14} (2004Og12, from analysis of six events); 1.0 ms {I+48-5} (2004Og07, from analysis of one event). 


level_energy_unit: KEV
level_spin_parity: 0+
level_lifetime_unit: MS
level_comment:
T$from 2021Sa01, deduced by authors from an analysis of a total of 16 correlated decay chains (11 direct chains starting with {+286}Fl nucleus, 11 indirect chains from |a decays in literature, and two in the present work). Other: 1.42 ms {I+343-59} deduced by 2021Sa01 from an analysis of the first two (implant)|a-SF correlated decay chains observed in the present work. The third chain observed in this work was ambiguous as to the assignment for {+286}Fl and/or {+288}Fl. Data for previously observed correlated events were taken by 2021Sa01 from 2004Og12, 2004Og07, 2006Og05, 2007Ho18, 2009St21, 2010El06 and 2012Og06. 


level_energy_unit: KEV
level_spin_parity: (0+)
level_comment:
E$from difference of E|a values to the g.s. and excited state, each corrected for recoil 
J$from 2021Sa01, possible unhindered |a decay from the 0+ g.s. of {+286}Fl. 


level_energy_unit: KEV
level_lifetime_unit: S
level_comment:
E$Assumed ground state. 
T$From 30 events. Note that the decay time of the escape-|a event associated with {+283}Cn in the chain reassigned to {+291}Lv in 2016Ho09 is not included in this value. 


level_energy_unit: KEV
level_spin_parity: 0+
level_lifetime_unit: MS
level_comment:
$Only the SF decay mode has been observed. Other: 2017Ka66 estimate %|a=2.9 from one of the two interpretations of Chain 3, where SF events are 32 times higher than the |a events from the decay of {+284}Cn. 
E$it is assumed that the observed activity is associated with the g.s. 
T$from average of 98 ms {I+20-14} (2017Og01 and 2015Og05 review articles) and 118 ms {I+24-17} (2016Ho09 review article). Value of 313 ms {I+570-123} from 2017Ka66 is not included in the recommended value due to its large uncertainty. Its inclusion gives only a slightly different weighted average of 113 ms {I+32-27}. Measurements: 101 ms {I+41-22} (2004Og12, from 12 events; also 97 ms {I+31-19} in 2004OgZZ and 2011Og07, from 17 events); 313 ms {+570-123} (2017Ka66) 
$Theoretical |a-decay half-life=78 min (1997Mo25) 


level_energy_unit: KEV
level_spin_parity: 0+
level_lifetime_unit: S
level_comment:
T$from 2021Sa01, deduced by authors from an analysis of a total of 49 correlated decay chains (27 direct chains starting with {+286}Fl nucleus, 11 indirect chains from |a decays in literature, and 11 in the present work). Other: 0.096 s {I+42-22} deduced by 2021Sa01 from an analysis of 11 correlated. Data for previously observed correlated events were taken by 2021Sa01 from 2004Og12, 2004Og07, 2004OgZZ, 2010Du06, 2011Ga19, 2012Ho12, 2014Ya33, 2017Ka66, and A. Yakushev et al. Nat. Chem. (to be published; ref. 9 in 2021Sa01). 
$Deduced partial half-lives: T{-1/2}(|a)=6.1 s {I+10-8}, T{-1/2}(SF)=0.123 s {I+20-15} (2021Sa01). 2021Sa01 stated that uncertaintieS in %|a and %SF decay modes were not included in the quoted partial half-lives 


level_energy_unit: KEV
level_spin_parity: 0+
level_lifetime_unit: MIN
level_uncertain: ?
level_comment:
$SF decay mode implied in tentative identification of {+286}Cn in {+294}Lv |) {+290}Fl |) {+286}Cn decay chain (2017Ka66) 
E$the reported activity is assumed to belong to the g.s. of {+286}Cn 
T$from 640 s {I+3100-300} listed in 2016Ho09 review. Other: 8.4 s {I+405-39} (2017Ka66) from one possible correlated event starting and ending in {+286}Cn, but this event was also interpreted in terms of production of {+293}Lv and decay chain ending in {+285}Cn or {+281}Ds. 
$E|a=8.670 MeV {I45} (2016Ho09 review) from {+286}Cn decay 


level_energy_unit: KEV
level_lifetime_unit: MS
level_comment:
E$the reported activity is assumed to belong to the g.s. of {+278}Nh 
J$0-,3- from |W(proton)=3/2-, |W(neutron)=3/2+ (1997Mo25, theory) 
T$from mean lifetime=2.0 ms {I+27-7} (2015Mo25 review, based on experimental data in 2012Mo25, 2007Mo43 and 2004Mo42). 
$E|a=11.68 MeV {I4} (2004Mo42), 11.52 MeV {I4} (2007Mo43), 11.82 MeV {I6} (2012Mo25) from |a decay of {+278}Nh. Average (unweighted) E|a=11.67 MeV {I9} (evaluator). 
$Production |s=19 fb {I+19-10} (2015Mo25 review, based on experiments reported in 2012Mo25, 2007Mo43 and 2004Mo42) 


level_energy_unit: KEV
level_lifetime_unit: S
level_comment:
$Only the |a-decay mode has been observed. 
E$the reported activity is assumed to belong to the g.s. of {+282}Nh 
J$2-,5- from |W(proton)=7/2-; |W(neutron)=3/2+ (1997Mo25,theory) 
T$73 ms {I+134-29} (2017Og01 and 2015Og05 reviews, same value in 2007Og02 and 2013Og01 from two observed correlated decay chains) 
$Production cross section=0.9 pb {I+16-6} (2007Og02), consistent with theoretical value from 2004Za03 
$E|a=10.63 MeV {I8} (2017Og01 and 2015Og05 reviews) from decay of {+282}Nh 


level_energy_unit: KEV
level_lifetime_unit: S
level_comment:
$Only the |a decay mode has been observed. 
$Measured A/q=284 with 81% probability and 97.6% confidence level (2018Ga34). With the expected charge state of 1{++}, deduced A=284. 
E$the reported activity is assumed to belong to the g.s. of {+284}Nh 
J$2-,5- from |W(proton)=7/2-; |W(neutron)=3/2+ (1997Mo25, theory) 
T$from 2016Fo10, based on detailed statistical analysis of 96 observed correlated events, starting from {+288}Mc, in three laboratories (FLNR-JINR-Dubna, GSI and Berkeley). The same value is listed in 2017Og01 review); Others: 0.92 s {I+11-9} (2016Fo10, from analysis of 109 decay chains by including the short chains as described by the authors; also 1.08 s {I+12-10} from analysis of 97 events); 0.91 s {I+17-13} (2015Og05, review). Measurements: 0.48 s {I+58-17} (2004Og03,2005Og02,2011Og07, from three correlated events); 0.92 s {I+16-12} (2013Ru11,2015Ru11 from all known decay chains); 0.97 s {I+25-17} (2013Og01, update of 0.94 s {I+29-18} in 2012Og02); 1.69 s {I+61-36}, 0.61 s {I+24-13} (2016Fo10, from correlated decay times using different combinations of data for 14 short decay chains in their work and from previous Dubna and Berkeley groups). 
$Theoretical Q(|a)=9.12 MeV, and |a-decay half-life=68 min (1997Mo25) 
$E|a=9.10 to 10.11 MeV (2017Og01,2015Og05 reviews); 9.7 to 10.1 MeV (2016Fo10); 9.97 MeV {I1} for one of the events, 9.10-10.11 MeV range for other chains (2013Ru11), 9.9-10.2 MeV (2015Ru11), 10.00 MeV {I6} (2011Og07 review), from {+284}Nh decay 


level_energy_unit: KEV
level_uncertain: ?
level_comment:
$Tentative level proposed by 2015Ru11 
E$in order to explain photon events, 2013Ru11 argue that {+288}Mc decays by one |a branch to an excited state in {+284}Nh, which then cascades down to the ground state of {+284}Nh via a few highly converted |g-transitions with energies below the K-shell binding energy of Nh atom. 


level_energy_unit: KEV
level_lifetime_unit: S
level_comment:
$Only the |a decay has been observed in the present experiment and several previous experiments. For possible |e decay of {+284}Nh to {+284}Cn, 2022Og07 analyzed a total of 20 events from the present as well as earlier experiments, with six cases which could possibly be assigned to |e/|b{++} branch of {+284}Nh to {+284}Cn (decaying by SF mode). From theory and systematics, 2022Og07 suggest %e+%|b{++}=5-6 or |<10. 
E$it is assumed that the observed activity corresponds to the ground state of {+284}Nh 
$E|a=9.10 to 10.16 MeV (2022Og07) 
T$from (Er)(|a)-correlated decays in the present experiment (2022Og07); authors give 0.89 s {I+9-7} from analysis of 55 events observed in the present experiment, and (96 or 113 events) observed in previous experiments (at DGFRS-JINR, GSI and LBNL). Other: 0.97 s {I+12-10} in {+284}Nh Adopted Levels in the ENSDF database (Jan 2019 update), where value was adopted from 2016Fo10 (Nucl. Phys. A953, 117). 


level_energy_unit: KEV
level_lifetime_unit: S
level_comment:
$Only the |a decay has been observed in the present experiment. 
$E|a=9.47 to 10.18 MeV (2022Og07) 
T$from (Er)(|a)-correlated decays (2022Og07) in this experiment and all the previous experiment at DGFRS-JINR facility during 2011-2013. Other: 0.93 s {I+45-23} in {+285}Nh Adopted Levels in the ENSDF database (Sept 2021 update), where value was adopted from nine events reported in DGFRS-JINR experiments in 2011-2013. 


level_energy_unit: KEV
level_lifetime_unit: S
level_comment:
%A$only the |a-decay mode has been observed 
E$the reported activity is assumed to belong to the g.s. of {+286}Nh 
J$1-,6- from |W(proton)=7/2- and |W(neutron)=5/2+ (1997Mo25,theory) 
T$from 2017Og01 and 2015Og05 reviews. Measurements: 20 s {I+94-9} (2010Og01, 2011Og04, Dubna work); 13 s {I+12-4} (2013Og04, Dubna work); 2.9 s {I+53-11} (2014Kh04, GSI work, authors also report T{-1/2}=7.9 s {I+55-23} by combining their data with those from 2013Og04). 
$E|a=9.61-9.75 MeV (Q(|a)=9.79 MeV {I5}) in 2017Og01 and 2015Og05 reviews. Measurements: 9.63 MeV {I10} (2010Og01,2011Og04); 9.61-9.75 MeV (2013Og04,2012Og06); 9.3 MeV {I3} (2014Kh04), from {+286}Nh |a decay 


level_energy_unit: KEV
level_lifetime_unit: S
level_uncertain: ?
level_comment:
E$the reported activity is assumed to belong to the g.s. of {+290}Nh 
T$from 2.0 s {I+960-9} listed in 2016Ho09 review. 
$E|a=9.710 MeV {I45} (2016Ho09 review) from {+290}Nh decay 


level_energy_unit: KEV
level_spin_parity: 0+
level_lifetime_unit: MS
level_comment:
$Only the SF decay mode has been observed. 
$The |a decay is less likely from theoretical half-life of 85 s for |a decay (1997Mo25). 2016Ho09 review article gives %|a|<25. 
E$it is assumed that the observed activity is associated with the g.s. 
$Production |s=2.6 pb {I+33-17} (2015Ut02) in {+240}Pu({+48}Ca,4n) reaction at 250 MeV; 0.23 pb {I+59-20} in {+239}Pu({+48}Ca,3n) at 245 MeV 
T$measured by 2015Ut02 from five EVR-SF correlated events leading to SF decay of {+284}Fl. The same value is given in 2017Og01 review. Other: 2.0 ms {I+27-7} (2016Ho09 review, half-life based on the analysis of three correlated events) 


level_energy_unit: KEV
level_spin_parity: 0+
level_lifetime_unit: MS
level_comment:
$Decay modes: others: %|a=52, %SF=48 (2016Ho09 review); %|a=50, %SF=50 (2012Og06). 
E$the reported activity is assumed to belong to the g.s. of {+286}Fl 
T$from 2016Ho09 review, analysis of all the 27 correlated decay chains reported, 25 in JINR-Dubna work and two in LBNL-Berkeley work. Other: 0.12 s {I+4-2} (2017Og01 and 2015Og05 reviews, also 2012Og06 from analysis of 20 chains out of a total of 25 observed correlated decay chains in 2012Og06, 2006Og05, 2004Og07 and 2004Og12). 
$E|a=10.21 MeV {I4} (2017Og01, 2015Og05 and 2016Ho09 reviews). Measurements: 10190 {I60} (2012Og06, from analysis of 12 events out of a total of 25 observed events in Dubna work, one in 2012Og06 study, and the rest in previous studies at Dubna); 10.21 MeV {I6} (2004Og12); 10.23 MeV {I4} (2009St21); 10.31 MeV {I10} (2010El06) 
$Production |s=1.4 pb {I+32-12} in {+242}Pu({+48}Ca,4n),E=244 MeV at center-of-target (2009St21), later adjusted to 3.1 pb {I+49-26} by 2010El06; 0.6 ps {I+9-5} in {+242}Pu({+48}Ca,4n),E=256 MeV (2010El06); 4.5 pb {I+36-19} in {+242}Pu({+48}Ca,4n),E=238 MeV (2004Og12). 


level_energy_unit: KEV
level_spin_parity: 0+
level_lifetime_unit: S
level_comment:
$Deduced %|a=55 (from b{-|a}=16/29) and %SF=45 (2021Sa01) in Table II of 2021Sa01, from all the reported correlated decay chains in literature and the two chains in present work. Other: %|a=60 {I+10-11}, %SF=40 {I+11-10} (2017Og01: Physica Scripta 92, 023003) 
T$from 2021Sa01, deduced by authors from an analysis of a total of 24 correlated decay chains (11 direct chains starting with {+286}Fl nucleus, 11 indirect chains from |a decays in literature, and two in the present work). Other: 0.093 s {I+224-39} deduced by 2021Sa01 from an analysis of the first two (implant)|a-SF correlated decay chains observed in the present work. The third chain observed in this work was ambiguous as to the assignment for {+286}Fl and/or {+288}Fl. Data for previously observed correlated events were taken by 2021Sa01 from 2004Og12, 2004Og07, 2006Og05, 2007Ho18, 2009St21, 2010El06 and 2012Og06. Note that in Table II of the Supplemental Material, total of 29 decay chains are mentioned (27 previous and two in the present work), but 24 used in the analysis of half-life. 
$Deduced partial half-lives: T{-1/2}(|a)=0.23 s {I+6-4}, T{-1/2}(SF)=0.27 s {I+7-5} (2021Sa01). With 55% SF decay, compiler obtains T{-1/2}(|a)=0.22 s {I+6-4}. 2021Sa01 stated that uncertainties in %|a and %SF decay modes were not included in the quoted partial half-lives 
$Energy of |a emitted by {+286}Fl: E|a=10.16 MeV {I1} deduced by 2021Sa01 from the analysis of the first (implant)|a-SF correlated decay chain observed in this work. Authors deduced E|a=10.19 MeV {I3} from an analysis of a total of 15 correlated decay chains (six direct chains starting with {+286}Fl nucleus, eight indirect chains from |a decays in literature, and one in the present work) 


level_energy_unit: KEV
level_spin_parity: 0+
level_lifetime_unit: S
level_comment:
$Only the |a decay mode has been observed. 
E$the reported activity is assumed to belong to the g.s. of {+288}Fl 
T$644 ms {I+138-97} (recommended by 2016Ho09, also 0.66 s {I+14-10} in 2015Og05,2017Og01). The recommended value does not include T{-1/2}=274 ms {I+500-108} from 2017Ka66 (also 2014MoZV), however its inclusion will not affect the adopted value significantly. Others: 0.52 s {I+22-13} (2011Ga19, earlier value was 0.47 s {I+24-12} in 2010Du06); 0.80 s {I+32-18} (2004Og12,2005Og03,2011Og07; 0.63 s {I+27-14} in 2004Og07) 
$Theoretical Q(|a)=9.1 MeV, and |a-decay half-life=631 s (1997Mo25) 
$E|a=9.934 MeV {I15} (2016Ho09); 9.94 MeV {I2} (2017Ka66); 9.93 MeV {I3} (2015Og05,2017Og01,2011Ga19); 9.95 MeV {I7} (2004Og12,2004Og07,2005Og03,2011Og07) from {+288}Fl |a decay 
E$no x-rays or |g-rays were observed in prompt coincidence with any EVR implant or |a-particle (2011Ga19) 
$Maximum production |s=9.8 pb {I+39-31} (2010Du06,2011Ga19), 5.3 pb {I+36-21} (2004Og07) 


level_energy_unit: KEV
level_spin_parity: 0+
level_lifetime_unit: S
level_comment:
T$from 2021Sa01, deduced by authors from an analysis of a total of 43 correlated decay chains (23 direct chains starting with {+288}Fl nucleus, 11 indirect chains from |a decays in literature, and nine in the present work). Other: 0.77 s {I+38-19} deduced by 2021Sa01 from an analysis of nine (implant)|a-SF correlated decay chains observed in the present work. Data for previously observed correlated events were taken by 2021Sa01 from 2004Og12, 2004Og07, 2004OgZZ, 2010Du06, 2011Ga19, 2012Ho12, 2014Ya33, 2017Ka66, and A. Yakushev et al. Nat. Chem. (to be published. ref. 9 in 2021Sa01). Note that in Table II of the Supplemental Material, total of 47 decay chains are mentioned (36 previous and 11 in the present work), but 43 used in the analysis of half-life. 
$Energy of |a emitted by {+288}Fl: E|a=9.92 MeV {I1} deduced by 2021Sa01 from the analysis of 11 (implant)|a-SF correlated decay chain observed in this work. Authors deduced E|a=9.92 MeV {I1} from an analysis of a total of 43 correlated decay chains (22 direct chains starting with {+286}Fl nucleus, ten indirect chains from |a decays in literature, and 11 in the present work) 


level_energy_unit: KEV
level_spin_parity: 0+
level_lifetime_unit: S
level_uncertain: ?
level_comment:
E$the reported activity is assumed to belong to the g.s. of {+290}Fl 
T$from 2016Ho09 review, also listed as 21 s {I+101-10}. Theoretical T{-1/2}(|a)=33 h, T{-1/2}(|b)>100 s (1997Mo25) 
$E|a=9.710 MeV {I45} (2016Ho09 review) from {+290}Fl decay, 9.72 MeV {I3} (2017Ka66) 


level_energy_unit: KEV
level_lifetime_unit: S
level_comment:
$Only the |a decay mode has been observed. 
$Measured A/q=288 with 83% probability and 97.6% confidence level (2018Ga34). With the expected charge state of 1{++}, deduced A=288. 
E$it is assumed that the observed activity corresponds to the ground state of {+288}Mc 
J$1-,4- from |W(proton)=5/2- and |W(neutron)=3/2+ (1997Mo25, theory). 
T$from 2016Fo10, based on detailed statistical analysis of 96 observed events in three laboratories (FLNR-JINR-Dubna, GSI and Berkeley). Others: 0.18 s {I2} (2016Fo10, from analysis of 109 decay chains by including the 14 short chains as described by the authors; also 0.191 s {I+28-21} from analysis of 98 chains, 0.177 s {I+20-16} from analysis of 97 chains); 174 ms {I+22-18} (2017Og01, review, also 164 ms {I+30-21} in 2015Og05 review). Measurements: 87 ms {I+105-30} (2004Og03,2005Og02,2011Og07 from three correlated events); 0.16 s {I+3-2} (2013Ru11,2015Ru11); 171 ms {I+42-28} (2013Og01, update of 173 ms {I+52-32} given in 2012Og02); 0.32 s {I+12-7}, 0.217 s {I+83-47} (2016Fo10, from correlated decay times using different combinations of data for 14 short decay chains in their work and in previous work from Dubna and Berkeley groups). 
$Theoretical Q(|a)=10.12 MeV, and |a-decay half-life=21 s (1997Mo25) 
$E|a=10.21 to 10.67 MeV (2017Og01), 10.3 to 10.6 MeV (2016Fo10), 10.29 to 10.58 MeV (2015Og05), 10.30 MeV {I1} for one of the chains (2013Ru11), 10.3-10.6 MeV (2015Ru11), from {+288}Mc decay, 10.46 MeV {I6} (2011Og07 review). 
$Maximum production |s=8.5 pb {I+64-37} at E({+48}Ca)=243.4 MeV (2012Og02,2013Og01); 3.5 pb {I+27-15} at E({+48}Ca)=239.8-240.8 MeV, 7.5 pb {I+37-28} at E=242.1 MeV, 7.2 pb {I+26-21} at E=245.0 MeV, |?4 pb at E=248.1 MeV. 


level_energy_unit: KEV
level_lifetime_unit: MS
level_comment:
$Only the |a decay has been observed in the present experiment and several previous experiments. No evidence for |e decay to {+288}Fl was found in 2022Og07, and in any of the previous experiments, as known decay chains of {+288}Fl were not observed in the present and previous experiments, with the exception of one candidate dubbed as 'T2' in 2016Fo10 (Nucl. Phys. A953, 117), where an escaped |a particle was followed by SF events, indicating %e+%|b{++}<0.7% From theory and systematics, 2022Og07 suggest %e+%|b{++}=4 or <6. 
E$it is assumed that the observed activity corresponds to the ground state of {+288}Mc 
$E|a=10.21 to 10.67 MeV (2022Og07) 
T$from (Er)(|a)-correlated decays (2022Og07); authors give 195 ms {I+19-15} from analysis of 55 events observed in the present experiment, and (96 or 113 events) observed in previous experiments (at DGFRS-JINR, GSI and LBNL). Other: 0.17 s {I2} in {+288}Mc Adopted Levels in the ENSDF database (Jan 2019 update), where value was adopted from 2016Fo10 (Nucl. Phys. A953, 117). 
$Measured production cross sections in {+243}Am({+48}Ca,3n): |s=17.1 pb {I+63-47} at E({+48}Ca)=240.9 MeV, about twice the value in previous studies using DGFRS (2013Og01: Phys. Rev. C 87, 014302); representing the largest production |s for a known superheavy nucleus at the island of stability (2022Og07). Also measured production |s=9.8 pb {I+26-21} at E({+48}Ca)=243.9 MeV, and 9.9 pb {I+51-34} at E({+48}Ca)=239.1 MeV (2022Og07) 


level_energy_unit: KEV
level_lifetime_unit: MS
level_comment:
$Only the |a decay has been observed in the present experiment. 
$E|a=10.15 to 10.55 MeV (2022Og07) 
T$from (Er)(|a)-correlated decays (2022Og07) in the present experiment and the previous ones at DGFRS-JINR in 2011-2013. Other: 296 ms {I+97-59} in {+289}Mc Adopted Levels in the ENSDF database (Sept 2021 update), where value was adopted from 16 events reported in DGFRS-JINR experiments in 2011-2013. 
$Measured production cross sections in {+243}Am({+48}Ca,2n): |s=1.1 pb {I+25-9} at E({+48}Ca)=240.9 MeV, 1.6 pb {I+12-7} at E({+48}Ca)=243.9 MeV, and <2.1 pb at E({+48}Ca)=239.1 MeV (2022Og07). 


level_energy_unit: KEV
level_lifetime_unit: S
level_comment:
$Only the |a decay mode observed. 
E$assumed that the observed activity is associated with the g.s. of {+290}Mc 
T$from 2017Og01 and 2015Og05 reviews. Measurements: 1.3 s {I+23-5} (2014Kh04, also 0.75 s {I+61-23} by combining their data with those from 2013Og04); 0.24 s {I+28-7} (2013Og04,2012Og06); 16 ms {I+75-8} (2011Og04,2010Og01) 
J$0-,5- from |W(proton)=5/2-, |W(neutron)=5/2+ (theory,1997Mo25) 
$E|a=9.78-10.31 MeV from the decay of {+290}Mc (2017Og01 and 2015Og05 reviews). Measurements: 10.31 MeV {I4} (2014Kh04); 10.81-10.97 MeV (2013Og04,2012Og06); 9.95 MeV {I40} (2011Og04,2010Og01) 


level_energy_unit: KEV
level_spin_parity: 0+
level_lifetime_unit: MS
level_comment:
$Only the |a decay mode has been observed. 
E$the reported activity is assumed to belong to the g.s. of {+290}Lv 
T$8.3 ms {I+35-19} (2017Og01,2015Og05 reviews); 8.3 ms {I+36-19} (2016Ho09 review). In 2016Ho09 review, two separate half-lives of 0.32 ms {I+26-10} and 14.9 ms {I+103-10} are assigned based on the statistical analysis of all the events observed by the Dubna group. Measurements: 8.3 ms {I+35-19} (2012Og06, from 11 events, one in 2012Og06 and 10 in 2006Og05). Others: 7.1 ms {I+32-17} (2006Og05,2011Og07); 15 ms {I+26-6} (2004Og07,2004Og12,2005Og03 from two events); 29 ms {I+140-33} (2002OgZX) 
$E|a=10.85 MeV {I7} (2017Og01,2015Og05 reviews; 10.84 MeV {I8} in 2011Og07 review); 10.85 MeV {I6} (2016Ho09 review). Measurements: 10850 {I70} (2012Og06, from a total of 11 events); 10840 {I80} (2006Og05). 
$Production |s=3.7 pb {I+36-18} at E*=37.9 MeV; 1.9 pb {I+21-10} at E*=42.7 MeV (2006Og05); |?1 pb at E*=(2004Og07) 


level_energy_unit: KEV
level_spin_parity: 0+
level_lifetime_unit: MS
level_comment:
$Only the |a decay mode has been observed. 
E$the reported activity is assumed to belong to the g.s. of {+292}Lv 
T$from analysis of eight decay chains (2012Ho12, also 2016Ho09, 2015Og01, 2015Og05, 2015OgZX, and 2017Og01 review articles), value is based on the analysis of a total of ten observed events (six by Dubna-Livermore collaboration and four by the GSI group) out of which four from each experiment were used for the determination of average half-life. Value of 11.9 ms {I+217-26} from two correlated events in 2017Ka66 is not included in this averaged value, however, its inclusion will hardly affect the adopted value. Other: T{-1/2}=18 ms {I+16-6} (2004Og12,2011Og07) from four out of six observed events assigned to {+292}Lv 
$Theoretical Q(|a)=10.82 MeV, and |a-decay half-life=43 ms (1997Mo25) 
$Only the |a-decay mode has been observed. Out of a total of ten events assigned to {+292}Lv, alpha-particle energies were analyzed from seven events, with an average E|a=10.628 MeV {I15} (2016Ho09,2015Og01) deduced from four events, implying Q(|a)=10.776 MeV {I15} for the decay of {+292}Lv populating the g.s. in {+288}Fl. Other E|a=10.66 MeV {I7} (2004Og12,2011Og07) from five out of six observed events assigned to {+292}Lv, 10.625 MeV {I15} (2012Ho12), 10.67 MeV {I2} (2017Ka66, from two correlated events). 
$Measured production |s=3.3 pb {I+25-14} at E({+48}Ca)=247 MeV (2004Og12); 3.4 pb {I+27-16} at E({+48}Ca)=265.4 MeV (2012Ho12); 3.1 pb {I+28-18} at E({+48}Ca)=216.6 MeV (2017Ka66). 


level_energy_unit: KEV
level_lifetime_unit: MS
level_comment:
$Only the |a-decay mode has been observed. 
E$observed activity is assumed to correspond to the g.s. of {+294}Ts 
$Q(|a):10960 keV {i100} from E|a=10.81 keV {i10}. 
J$1-,2- from |W(proton)=3/2-; |W(neutron)=1/2+ (1997Mo25, theory) 
T$from 2017Og01 and 2015Og05 reviews. Measurements: 51 ms {I+94-20} (2014Kh04, from two correlated events, also 51 ms {I+41-16} by combining their data with the decay chains from 2013Og04); 50 ms {I+60-18} (2013Og04 from three events out of a total of four observed events reported in 2013Og04, 2012Og06 and 2011Og04); 78 ms {I+370-36} (2010Og01,2011Og04,2011Og07 from one correlated event) 
$Measured E|a=11.05 MeV {I4} (2014Kh04) from decay of {+294}Ts; Average E|a=10.81-10.97 MeV (2013Og04), 10.81 MeV {I10} (2011Og07 review), deduced from 3 events out of a total of 4 observed events 
$Production cross-sections: 0.5 pb {I+11-4} at E*=35 MeV (2011Og04); 0.30 pb {I+70-26} at E*=35 MeV (2012Og06); 1.1 pb {I+12-6} at E*=35 MeV (2013Og04); 0.7 pb {I+16-6} at E({+48}Ca)=252.0-256.1 MeV and 0.9 pb {I+20-7} at E({+48}Ca)=255.9-260.0 MeV (2014Kh04) 


level_energy_unit: KEV
level_comment:
E$observed activity is assumed to correspond to the g.s. of {+294}Ts 
T$|Dt for the two observed chains was 55.9 ms and 92.6 ms. 2019Kh04 do not report a half-life from these times between implant and observed |a{-1}. 
$observed alpha energies of the two chains are E|a=11070 {I40} and E|a=11020 {I40} (2019Kh04) 


level_energy_unit: KEV
level_spin_parity: 0+
level_lifetime_unit: MS
level_comment:
$Only the |a decay mode has been observed. %SF|<20 (2016Ho09), |<50 (2006Og05). 2018Br13 searched for SF decay mode of {+294}Og, but presence of a large number of SF events, possibly from SF decay of {+258}No, obscured any SF activity from {+294}Og. 
E$observed activity is assumed to correspond to the g.s. of {+294}Og 
T$from evaluation by 2018Br13 based on observation of a total of five decay chains for {+294}Og in different experiments). one observed by 2018Br13, one by 2012Og06, two by 2006Og05, and one by 2004Og12. Others: 2012Og06 (also 2017Og01 and 2015Og05 reviews) gave T{-1/2}=0.69 ms {I+64-22} ms from four observed events. Value of 0.69 ms {I+69-23} is listed in 2016Ho09 review. Earlier values: 0.89 ms {I+107-31} (from three events,2006Og05,2011Og07); 1.8 ms {I+750-13} (2004Og12, from one event at 95% confidence level, or 1.8 ms {I+84-8} at 68% confidence level) 
$Cross section for production=0.9 pb {I+32-8} (2018Br13) at E{+*}=35.2 MeV {I22} and 36.4 MeV {I22}; 0.30 pb {I+70-26} (2012Og06) at E{+*}=26.6-37.5 MeV; and 0.5 pb {I+16-3} (2006Og05) at E{+*}=32.1-36.6 MeV, where E{+*} is the excitation energy of the compound nucleus of {+297}Og 
$E|a=11.70 MeV {I3} (evaluated by 2018Br13 from five observed decay chains, one in their experiment, and four in previous experiments, as mentioned above in comment for T{-1/2}). Others: 11.66 MeV {I6} (2012Og06, from four events); 11650 {I60} (2006Og05, 2011Og07 from three events). 


