ADOPTED LEVELS for 250Es

Author: Y. Akovali |  Citation: Nucl. Data Sheets 94,131 (2001) |  Cutoff date: 1-Aug-2001 

 Full ENSDF file | Adopted Levels (PDF version) 


Q(β-)=-8.5×102 keV SYS(n)= 6.02×103 keV SYS(p)= 3.79×103 keV SYQ(α)= 6.83×103 keV SY
Reference: 2012WA38

General Comments:

For calculations of fission barrier, see for example, 1980Ku14 and 1991Os05.

Q-value: Note: Current evaluation has used the following Q record





E(level)
(keV)
Jπ(level) T1/2(level)
  0.0 (6+) 8.6 h 1 
% ε > 97
% α < 3
  0.0+X 1(-) 2.22 h 5 
% ε ≤ 100

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Additional Level Data and Comments:

E(level)Jπ(level)T1/2(level)Comments
  0.0(6+) 8.6 h 1 
% ε > 97
% α < 3
In analogy to 245Pu, 247Cm and 249Cf, the 155Th odd neutron probably is in the n 9/2[734] state; analogy to 249Es suggests p 3/2[521] orbital, analogy to 251Es, 253Es suggests p 7/2[633] for the 99Th proton. The most probable assignment is, therefore, 6+,(p 3/2[521],n 9/2[734]).
E(level): In analogy to 245Pu, 247Cm and 249Cf, the 155Th odd neutron probably is in the n 9/2[734] state; analogy to 249Es suggests p 3/2[521] orbital, analogy to 251Es, 253Es suggests p 7/2[633] for the 99Th proton. The most probable assignment is, therefore, 6+,(p 3/2[521],n 9/2[734]).
  0.0+X1(-) 2.22 h 5 
% ε ≤ 100
Only the ε decay was studied; no α’s were observed.
E(level): Only the ε decay was studied; no α’s were observed.

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