ADOPTED LEVELS for 186Bi
Authors: J. C. Batchelder and A. M. Hurst, M. S. Basunia | Citation: Nucl. Data Sheets 183, 1 (2022) | Cutoff date: 1-Mar-2022
Full ENSDF file | Adopted Levels (PDF version)
| Q(β-)=-7247 keV 25 | S(n)= 8980 keV SY | S(p)= -1107 keV 23 | Q(α)= 7757 keV 12 | ||
| Reference: 2021Wa16 |
| E(level) (keV) | Jπ(level) | T1/2(level) |
| 0.0 | (3+) | 14.8 ms 8 % ε ≈ 4.5 % α ≈ 95.5 |
| 0.0+X | (10-) | 9.8 ms 4 % ε = ? % α ≈ 100 |
Jπ(level): Based on the systematics of 10- and 3+ isomers in neighboring even-A Bi isotopes. Since the heavy-ion reaction used to produce the 186Bi is likely to favor formation of the higher-spin isomer, the stronger α group (7261α) might be expected to arise from that isomer (1997Ba21).
Additional Level Data and Comments:
| E(level) | Jπ(level) | T1/2(level) | Comments |
| 0.0 | (3+) | 14.8 ms 8 % ε ≈ 4.5 % α ≈ 95.5 | %ε+%β+SF: Estimated from the ratio of observed fission events to observed α events from both isomers (2013La02). Assuming equal population of the two isomers, the β-delayed fission probability was estimated with a factor of ≈ 5 uncertainty (2013La02). E(level): %ε+%β+SF: Estimated from the ratio of observed fission events to observed α events from both isomers (2013La02). Assuming equal population of the two isomers, the β-delayed fission probability was estimated with a factor of ≈ 5 uncertainty (2013La02). |
| 0.0+X | (10-) | 9.8 ms 4 % ε = ? % α ≈ 100 | %β+F: Estimated from the ratio of observed fission events to observed α events from both isomers (2013La02). Assuming equal population of the two isomers, the β-delayed fission probability was estimated with a factor of ≈ 5 uncertainty (2013La02). E(level): %β+F: Estimated from the ratio of observed fission events to observed α events from both isomers (2013La02). Assuming equal population of the two isomers, the β-delayed fission probability was estimated with a factor of ≈ 5 uncertainty (2013La02). |
Production: From 97Mo(92Mo,p2nγ) in 1997Ba21); From 94Mo(93Nb,n) and 95Mo(93Nb,2n) in 2003An27; and from 142Nb(50Cr,p3n) in 2013La02. α decay from two isomers reported by 1997Ba21, 2003An27, and 2013La02.
2013La02: Detected three events of β-delayed fission from 186Bi and compared counts of β-delayed fission events and α decays and estimated β-delayed fission probability of 186Bi.
Q-value: ΔS(n)=80 (syst) (2021Wa16)