ADOPTED LEVELS for 245Bk

Authors: E. Browne, J. K. Tuli |  Citation: Nucl. Data Sheets 112, 447 (2011) |  Cutoff date: 1-Jun-2010 

 Full ENSDF file | Adopted Levels (PDF version) 


Q(β-)=-1571 keV 3S(n)= 6971 keV 15S(p)= 3927.2 keV 14Q(α)= 6454.5 keV 14
Reference: 2012WA38

References:
  A  249Es α decay  B  245Cf ε decay

General Comments:

Theoretical calculations on α and spontaneous fission: 2010Ni02, 2008Do12, 2005Re16, 2004Pa40, 2002Re37.

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






E(level)
(keV)
XREFJπ(level) T1/2(level)
      0.0AB 3/2- 4.95 d 3 
% ε = 99.88 1
% α = 0.12 1
      0.0+XA  7/2(+)  
   61+X 13 A  (9/2+)  
  ≈1560   2 ns 1 
% SF = 100

Back to top

Band Transitions:

E(level)
(keV)
Jπ(level) T1/2(level)
Band 1 - 3/2[521] ROTATIONAL band.
      0.0 3/2- 4.95 d 3 
% ε = 99.88 1
% α = 0.12 1
E(level)
(keV)
Jπ(level) T1/2(level)
Band 2 - 7/2[633] ROTATIONAL band.
      0.0+X 7/2(+)  
   61+X 13  (9/2+)  

Back to top

Additional Level Data and Comments:

E(level)Jπ(level)T1/2(level)Comments
      0.03/2- 4.95 d 3 
% ε = 99.88 1
% α = 0.12 1
Half-life for SF decay was calculated by 1978Po09 as ≈10×106 years and by 1985Lo17 as ≈10×104 years.
E(level): Half-life for SF decay was calculated by 1978Po09 as ≈10×106 years and by 1985Lo17 as ≈10×104 years. 3/2[521] ROTATIONAL band.
      0.0+X7/2(+)   E(level): 7/2[633] ROTATIONAL band. E(7/2+ level)-E(3/2- level)=40.8 2 in 247Bk and 35.7 3 in 251Bk suggests that x≈40 keV.
   61+X(9/2+)   E(level): 7/2[633] ROTATIONAL band. E(7/2+ level)-E(3/2- level)=40.8 2 in 247Bk and 35.7 3 in 251Bk suggests that x≈40 keV.
   1560 2 ns 1 
% SF = 100
Only SF decay was observed. T1/2(γ)/T1/2(SF) was calculated by 1972We09 as 5.6×10-8. Other: 2002Si26.
E(level): Only SF decay was observed. T1/2(γ)/T1/2(SF) was calculated by 1972We09 as 5.6×10-8. Other: 2002Si26.

Back to top