ADOPTED LEVELS for 260Lr

Author: Y. A. Akovali |  Citation: Nucl. Data Sheets 87, 301 (1999) |  Cutoff date: 1-Oct-1998 

 Full ENSDF file | Adopted Levels (PDF version) 


Q(β-)=-8.7×102 keV SYS(n)= 5.65×103 keV SYS(p)= 3.12×103 keV SYQ(α)= 8.40×103 keV SY
Reference: 2012WA38

General Comments:

Assignment: 249Bk(95-MeV 18O), 248Cm(78-MeV 15N), parent of 256Fm (ε daughter of 256Md) (1971Es01).

For calculation of fission barrier as a function of deformation, see 1985Cw01.

For calculations of production cross sections, see 1987Ma45, 1987Ma50.

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




E(level)
(keV)
T1/2(level)
  0.0 180 s 30 
% α = 80 20
% ε < 40

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Additional Level Data and Comments:

E(level)Jπ(level)T1/2(level)Comments
  0.0 180 s 30 
% α = 80 20
% ε < 40
%ε<40 was estimated by 1971Es01 by comparing the number of 260Lr α’s observed with the number of 260No SF decay events; 40% was obtained when 260No is assumed to decay by spontaneous fission only. Since 256Fm was also produced in the reaction, the estimate for ε decay is very crude (1971Es01).
E(level): %ε<40 was estimated by 1971Es01 by comparing the number of 260Lr α’s observed with the number of 260No SF decay events; 40% was obtained when 260No is assumed to decay by spontaneous fission only. Since 256Fm was also produced in the reaction, the estimate for ε decay is very crude (1971Es01).

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