ADOPTED LEVELS for 261Bh

Author: Agda Artna-cohen |  Citation: Nucl. Data Sheets 88, 155 (1999) |  Cutoff date: 31-Jul-1999 

 Full ENSDF file | Adopted Levels (PDF version) 


S(n)= 8.3×103 keV SYS(p)= 7.0×102 keV SYQ(α)= 1.050×104 keV 5
Reference: 2012WA38

General Comments:

Calculations, compilations:

Favored α decay: 1993Bu09

g.s. properties: 1997Mo25, 1995Mo29

Single-particle Nilsson levels: 1994Cw02

1994Cw02 calculate the following single-particle level sequence: g.s. 5/2[512], 0.42 MeV 9/2[624], 0.86 MeV 9/2[505], 0.88 MeV 1/2[521]

Assignment: 209Bi(54Cr,2n) 4.87 to 5.07 MeV/nucleon, parent of 257Db, grandparent of 253Lr from α-α-α correlation (1989Mu09,1986MuZX,1988MuZX).

1976Og02 (209Bi(54Cr,2n)) observed an ≈1.2 ms SF activity followed by an ≈5 ms SF activity and assigned these to 261Bh and daughter 257Db. 1989Mu09 have not confirmed the SF activity of 261Bh and suggest that the 5 s SF activity is from 258Rf (from 258Db ε).

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

Q-value: Estimated ΔS(n)=700, ΔS(p)=240 (1995Au04)




E(level)
(keV)
T1/2(level)
  0.0 12 ms +5-3 
% α = 95 5
% SF < 10

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Additional Level Data and Comments:

E(level)Jπ(level)T1/2(level)Comments
  0.0 12 ms +5-3 
% α = 95 5
% SF < 10
Calculated: T1/2(ε+β+)=13 s, T1/2(α)=8 ms (1997Mo25).

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