172GD    COMMENTS                                                ENSDF    202102
172GD  H TYP=FUL$AUT=BALRAJ SINGH$CIT=ENSDF$CUT=31-JAN-2021$                    
172GD C  TITL$NUCLEAR DATA SHEETS FOR 172GD                                     
172GD c  AUTH$BALRAJ SINGH                                                      
172GD c  INST$Department of Physics and Astronomy,                              
172GD#c       McMaster University, Hamilton, Ontario,                           
172GD#c       Canada, L8S 4M1                                                   
172GD c  ABST$Information about the tentative identification and production of  
172GD2c  {+172}Gd nuclide from 2018Sh11 is presented.                           
172GD c  CUT$Literature available up to Jan 31, 2021 has been consulted.        
172GD C  CIT$ENSDF                                                              
172GD c  FUND$                                                                  
                                                                                
172GD    ADOPTED LEVELS                                          ENSDF    202102
172GD  H TYP=FUL$AUT=BALRAJ SINGH$CIT=ENSDF$CUT=31-JAN-2021$                    
172GD  Q 6030      CA 4980   CA 13160  CA -3570  CA    2019Mo01                 
172GD cQ $S(2n)=8540, S(2p)=24510 (theory, 2019Mo01)                            
172GD cQ $Q(|b{+-}n)=1900 (deduced by evaluator from                            
172GD2cQ theoretical values in 2019Mo01)                                        
172GD c  2018Fu08: {+172}Gd nuclide tentatively identified at the               
172GD2c  RIBF-RIKEN facility using the {+9}Be({+238}U,F) reaction with a        
172GD3c  {+238}U{+86+} beam of E=345 MeV/nucleon produced by the RIBF           
172GD4c  accelerator complex. Target={+9}Be with a thickness of 2.92 mm.        
172GD6c  Nuclidic identification (PID) was made by determining the atomic number
172GD7c  Z and mass-to-charge (A/Q) ratio of the ions using magnetic rigidity,  
172GD7c  time-of-flight, and energy loss (tof-B|r-|DE method) using the BigRIPS 
172GD8c  fragment separator. The time-of-flight was measured using thin plastic 
172GD9c  scintillators placed at foci of the BigRIPS. The B|r values were       
172GDAc  deduced from trajectory reconstruction of measured position and angle  
172GDBc  of fragments at each focus using parallel plate avalanche counters     
172GDCc  (PPACs). For|DE values, separated fragments were transported to an     
172GDDc  achromatic focus and implanted in a Si stack with 14 layers of Si PIN  
172GDEc  detectors, surrounded by four HPGe clovers for isomer tagging by       
172GDFc  detecting delayed gamma rays from known isomeric states in fission     
172GDGc  fragments. Comparison of measured cross sections with theoretical      
172GDHc  calculations using LISE{++} abrasion-fission (AF) model.               
172GD c  Theoretical calculations: seven primary reference in the NSR database  
172GD2c  (available at www.nndc.bnl.gov/nsr/), five for nuclear structure and   
172GD3c  two for radioactive decay half-lives and other properties              
172GD  L 0             0+                                                      ?
172GD2 L %B-=100 $ %B-N=?                                                       
172GD cL $Only |b{+-} decay mode is expected, followed by delayed-neutron decay,
172GD2cL thus 100% |b{+-} decay is assigned by inference.                       
172GD cL $Theoretical T{-1/2}=353.4 ms, %|b{+-}n=1 (2019Mo01)                   
172GD cL $Theoretical T{-1/2}=565.4 ms, %|b{+-}n=0.4 (2016Ma12)                 
172GD cL $Only two counts were tentatively assigned to {+172}Gd for spectrometer
172GD2cL setting on Gd, and none for setting on Pr, making the identification   
172GD3cL of this isotope uncertain                                              
172GD cL $Production |s=3.9 pb {I+51-25} for Gd setting, with 50% systematic    
172GD2cL uncertainty on |s value (2018Fu08)                                     
172GD cL T$lower limit from time-of-flight of 550 ns given in 2018Fu08.         
172GD2cL Actual half-life is expected to be much longer as suggested by the     
172GD3cL theoretical values of 353 ms (2019Mo01) and 565 ms (2016Ma12). From a  
172GD4cL general decreasing trend of half-lives with increasing neutron number, 
172GD5cL T{-1/2} for {+172}Gd is expected to be <1 s, based on measured         
172GD6cL half-lives of 3.03 s for {+168}Gd, 0.75 s for {+169}Gd, and            
172GD7cL 0.41 s for {+170}Gd, available in literature.