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 SY | S(p)= 7.0×102 keV SY | Q(α)= 1.050×104 keV 5 | |||
| Reference: 2012WA38 |
| E(level) (keV) | T1/2(level) |
| 0.0 | 12 ms +5-3 % α = 95 5 % SF < 10 |
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). |
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 8100 syst 430 syst 10560 50 1995Au04
Q-value: Estimated ΔS(n)=700, ΔS(p)=240 (1995Au04)