ADOPTED LEVELS for 256Md

Author: Balraj Singh |  Citation: Nucl. Data Sheets 141, 327 (2017) |  Cutoff date: 22-Mar-2017 

 Full ENSDF file | Adopted Levels (PDF version) 


Q(β-)=-370 keV SYS(n)= 5460 keV SYS(p)= 3630 keV SYQ(α)= 7740 keV SY
Reference: 2017WA10

References:
  A  260Lr α decay (180 S) 

General Comments:

256Md produced and identified by Ghiorso et al., Phys. Rev. 98, 1518 (1955) in 253Es(α,n),E=48 MeV reaction, followed by chemical separation. The half-life was reported to be about 0.5 hour. Later studies: 1958Ph40, 1965Si14, 1970Fi12, 1971Ho16, 1993Mo18

Theoretical calculations: consult the Nuclear Science References (NSR) database for about 27 theory references.

1986So12: nuclear structure theory reference

Q-value: Estimated uncertainties (2017Wa10): 120 for Q(β-), S(n) and S(p); 110 for Q(α)

Q-value: S(2n)=12140 160, S(2p)=9110 120 (syst,2017Wa10)






E(level)
(keV)
XREFJπ(level) T1/2(level)
     0.0A (1-) 77.7 m 18 
% ε = 90.8 7
% α = 9.2 7
% SF < 3
  ≈240A  

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Additional Level Data and Comments:

E(level)Jπ(level)T1/2(level)Comments
     0.0(1-) 77.7 m 18 
% ε = 90.8 7
% α = 9.2 7
% SF < 3
(α)/(α+ε)=9.2% 7 is adopted from 8.5% 8, determined by 1970Fi12 from K| x ray/α intensities, and 9.9% 5, determined by 1971Ho16 from 256Fm growth. The latest value of 11% 3, obtained by 1993Mo18, is in agreement with the earlier values. %α=9.2 7 is an unweighted average of earlier measurements. 2000Ah02 quote %ε=92, but the source reference is not given.
E(level): (α)/(α+ε)=9.2% 7 is adopted from 8.5% 8, determined by 1970Fi12 from K| x ray/α intensities, and 9.9% 5, determined by 1971Ho16 from 256Fm growth. The latest value of 11% 3, obtained by 1993Mo18, is in agreement with the earlier values. %α=9.2 7 is an unweighted average of earlier measurements. 2000Ah02 quote %ε=92, but the source reference is not given.

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