19MG 9BE(20MG,19MG):T1/2:XUNDL-4 2014VO05 201408 19MG c Compiled (unevaluated) dataset from 2014Vo05 19MG c Phys Rev C 90, 014301 (2014) 19MG c Compiled by J. Kelley and C.G. Sheu (TUNL), Aug. 01, 2014. 19MG c In a study of the {+19}Mg --> {+17}Ne+2p lifetime, the authors produced 19MG2c {+19}Mg nuclei via one neutron knockout reactions from {+20}Mg, and 19MG3c then measured the {+19}Mg decay lifetime by sampling the {+19}Mg and 19MG4c {+17}Ne reaction product intensities at various transit times 19MG5c (distances) from the reaction target. 19MG c A beam of E({+20}Mg)=91 MeV ions, produced by fragmenting an 19MG2c E({+24}Mg)=170 MeV/nucleon beam on a thick {+9}Be production target in 19MG3c the NSCL/A1900 fragment separator, impinged on a {+nat}C foil located 19MG4c at the S800 target position. The {+19}Mg nuclides produced via single 19MG5c neutron knockout quickly decay via two-proton emission yielding 19MG6c {+17}Ne+2p. A 69 mg/cm{+2} double sided position sensitive strip 19MG7c detector was placed at distances of x=0, 0.1, 0.5 and 1.0 mm downstream 19MG8c of the target to measure and identify the products by energy loss. The 19MG9c ingrowth of the {+17}Ne beam composition at these positions is analyzed 19MGac and used to determine the {+19}Mg lifetime. Significant systematic 19MGbc effects are discussed. 19MG c Depending on different assumptions of the {+17}Ne yield from prompt 19MG2c reaction processes, {+19}Mg mean lifetimes of |t=1.75 ps {I+43-42} or 19MG3c 6.4 ps {I+24-27} are deduced. With further development, the method 19MG4c holds promise for providing precision lifetimes. 19MG cL J$From Adopted Levels of {+19}Mg in ENSDF database. 19MG L 0 1/2- 3.5 PS 28 19MG cL T$the authors provided a range of lifetime values that depend on the 19MG2cL prompt {+nat}C({+20}Mg,{+17}Ne) yields. The value given here indicates 19MG3cL the range of half-lives covered in two scenarios discussed in the text. 19MG 9BE(20MG,19MG):XUNDL-5 2018XU04 201811 19MG c Compiled (unevaluated) dataset from 2018Xu04: 19MG2c Phys Rev C 97, 034305 (2018). See also 2012Mu05: 19MG3c Phys Rev C 85, 044325 (2012) from the same group. 19MG c Compiled by B. Singh (McMaster), June 21, 2018. 19MG c 2018Xu04: measured proton unbound states in {+19}Mg and {+18}Na by 19MG2c fragmenting a {+20}Mg beam in {+9}Be target and analyzing the 19MG3c p{-1}-p{-2}, p{-1}-{+17}Ne and p{-2}-{+17}Ne particle correlations. 19MG c A beam of {+20}Mg ions produced by fragmenting 685 MeV/nucleon {+36}Ar 19MG2c beam impinged on a {+9}Be target, and separating fragments using FRS 19MG3c at GSI. The target was surrounded by an array of four position 19MG4c sensitive detector telescopes that measured the breakup particle 19MG5c charged particle angular correlations (p{-1}-p{-2}, p{-1}-{+17}Ne and 19MG6c p{-2}-{+17}Ne). 19MG7c The excited states in {+19}Mg appear as "arc bands" in the 19MG8c |q(p{-1}-{+17}Ne) vs. |q(p{-2}-{+17}Ne) angular correlation spectrum. 19MG9c Analysis of events along a fixed or constant radius provides details 19MGAc about the initial {+19}Mg state and the {+18}Na states populated in the 19MGBc sequential decay to {+17}Ne{-g.s.}+2p 19MG cL J$From {+19}Mg Adopted Levels in the ENSDF database: Jan 2014 update. 19MG L 0 1/2- 19MG2 L %2P=100 19MG cL $Decays by 2p to {+17}Ne g.s. 19MG cL E$from Q(2p)=0.87 MeV {I+24-7} 19MG L 1.8E3 6 (3/2-) 19MG2 L %P=100 19MG cL E$1.6 MeV {I+8-4} from Q(2p)=2.5 MeV {I+8-4} 19MG cL $Decays by sequential 1p emissions via the 19MG2cL states in {+18}Na to {+17}Ne 19MG L 2.3E3 11 (5/2-&3/2-) 19MG2 L %P=100 19MG cL E$doublet, 2.3 MeV {I+12-10} from Q(2p)=3.2 MeV {I+12-10} 19MG cL $Decays by sequential 1p emissions via the 19MG2cL states in {+18}Na to {+17}Ne 19MG L 4.25E3 35 (3/2-) 19MG2 L %P=100 19MG cL E$4.2 MeV {I+4-3} from Q(2p)=5.1 MeV {I3} 19MG cL $Decays by sequential 1p emissions via the 19MG2cL states in {+18}Na to {+17}Ne 19MG L 8.0E3 8 19MG2 L %P=100 19MG cL E$8.0 MeV {I+8-7} from Q(2p)=8.9 MeV {I+8-7}. 19MG2cL New state reported by 2018Xu04 19MG cL $Decays by sequential 1p emissions via the 19MG2cL states in {+18}Na to {+17}Ne 19MG 9BE(20MG,19MG):XUNDL-6 2024NI16 202502 19MG c Compiled (unevaluated) dataset from 2024Ni16. 19MG c Phys. Rev. C 110, L061301 (2024). 19MG c Compiled by K. Setoodehnia and J. Kelley (TUNL), January 6, 2025. 19MG c The authors investigated the N=8 shell closure near the proton drip 19MG2c line by spectroscopic studies of {+19}Mg and {+20}Mg using the 19MG3c invariant mass technique. 19MG c The experiment was performed at the NSCL, where a 170 MeV {+24}Mg 19MG2c primary beam impinged on a {+9}Be target to produce a 103 MeV {+20}Mg 19MG3c beam with 31% purity via projectile fragmentation. This beam impinged 19MG4c on a 1-mm-thick {+9}Be target, which populated the {+19}Mg* resonant 19MG5c states through one neutron knockout reaction. The energies and 19MG6c emission angles of the protons from sequential 2p decays of the 19MG7c populated states were measured in coincidence using an annular position 19MG8c sensitive Si-|DE detector backed by two concentric rings of 4 inner and 19MG9c 16 outer position sensitive CsI(Tl)-E detectors. The combined telescope 19MGac array covered |q{-lab}=1.2|'-10.1|'. The emission angles of the {+17}Ne 19MGbc residues from the {+19}Mg*|)p+{+18}Na|)p+{+17}Ne decay sequence were 19MGcc measured using two orthogonal ribbons of scintillating fibers. Each 19MGdc ribbon contained 64 square-shaped fibers which were coupled to an 8|*8 19MGec multianode PMT that was resistively read out. This assembly was placed 19MGfc downstream the central hole of the |DE-E telescope. The energies of 19MGgc the {+17}Ne decay products were measured using the S800 spectrograph, 19MGhc which was located downstream the scintillating fiber assembly. 19MG c The authors deduced the decay energy spectrum of {+19}Mg using the 19MG2c invariant mass method and by measuring {+17}Ne+2p decay events. This 19MG3c spectrum displays 5 states that were fit using Breit-Wigner line 19MG4c shapes to deduce the excitation energies and widths of the {+19}Mg* 19MG5c states. Comparison with previous experimental results and shell model 19MG6c calculations are provided. For the strongest {+19}Mg populated states, 19MG7c the authors reconstructed the {+19}Mg*|){+18}Na+p|){+17}Ne+2p 19MG8c sequential decay paths through the {+18}Na intermediate states by 19MG9c gating on the {+17}Ne+p decay events. The results were consistent with 19MGac previous experimental results. 19MG c The authors discussed the systematics of the energy difference for the 19MG2c 1/2{+-}{-1} and 1/2{++}{-1} states for N=7 isotones and its relation 19MG3c to the N=8 shell closure near proton drip line. 19MG CL T$LABEL=|G 19MG CL S$LABEL=E{-c.m.}({+17}Ne+2p) (keV) 19MG cL E$Excitation energies are deduced by the authors based on experimental 19MG2cL ground state energy from AME-2020 (2021Wa16). 19MG cL J$Based on comparison with shell model calculations by the authors. 19MG L 0 1/2- 0 KEV +70-0 794 1 19MG cL T$The authors reported |G=0.000 MeV {I70}. 19MG cL $Yield{-relative}=1. 19MG cL $The configuration was determined to be 1{Ip}{-1/2} from shell model. 19MG cL $Decays via proton emission to {+18}Na, which in turn decays to 19MG2cL {+17}Ne{-g.s.}. 19MG L 1050 3 (3/2-) 15 KEV +50-15 1844 3 19MG cL T$The authors reported |G=0.015 MeV {I50}. 19MG cL $Yield{-relative}=0.320 {I8}. 19MG cL $The configuration was determined to be 1{Ip}{-3/2} from shell model. 19MG cL $Decays via proton emission to {+18}Na, which in turn decays to 19MG2cL {+17}Ne{-g.s.}. 19MG L 2.03E3 1 (1/2+) 0 KEV +70-0 2.82E3 1 19MG cL T$The authors reported |G=0.00 MeV {I7}. 19MG cL $Yield{-relative}=0.032 {I6}. 19MG cL $The configuration was determined to be 2{Is}{-1/2} from shell model. 19MG L 2.47E3 1 (5/2+,1/2-,3/2-) 0.04 MEV +15-4 3.26E3 1 19MG cL T$The authors reported |G=0.04 MeV {I15}. 19MG cL $Yield{-relative}=0.214 {I9}. 19MG cL $The configuration was determined to be 1{Id}{-5/2}, 1{Ip}{-1/2}, or 19MG2cL 1{Ip}{-3/2} from shell model. 19MG L 4.75E3 3 0 KEV +40-0 5.54E3 3 19MG cL T$The authors reported |G=0.00 MeV {I4}.