ADOPTED LEVELS for 244Bk
Author: C.D. Nesaraja | Citation: Nucl. Data Sheets 146, 387 (2017) | Cutoff date: 31-Aug-2017
Full ENSDF file | Adopted Levels (PDF version)
| Q(β-)=-764 keV 15 | S(n)= 6047 keV 15 | S(p)= 3757 keV 14 | Q(α)= 6779 keV 4 | ||
| Reference: 2017WA10 |
| References: | |||
| A | 248Es α decay | ||
| E(level) (keV) | XREF | Jπ(level) | T1/2(level) |
| 0.0 | (4-) | 5.02 h 3 % ε = 99.994 3 % α = 0.006 3 | |
| 140 Syst. | A | ||
| 170 Syst. | A | ||
| 200 50 | A | ||
| 0+X | 820 ns 60 % SF ≤ 100 |
E(level): Except for the SF isomer, the excited states given here were populated in 248Es α decay only. Their energies are obtained from experimental α energies and Qα(248Es)=7160 50 (syst, 2017Wa10)
Additional Level Data and Comments:
| E(level) | Jπ(level) | T1/2(level) | Comments |
| 0.0 | (4-) | 5.02 h 3 % ε = 99.994 3 % α = 0.006 3 | Branchings were determined by 1956Ch77 from 244Cm yield and 244Bk α activity; α/ε ratio= 6 ×10-5. Uncertainty is deduced by using T1/2(α decay)=8 y 3, quoted by 1956Ch77. E(level): Branchings were determined by 1956Ch77 from 244Cm yield and 244Bk α activity; α/ε ratio= 6 ×10-5. Uncertainty is deduced by using T1/2(α decay)=8 y 3, quoted by 1956Ch77. |
| 0+X | 820 ns 60 % SF ≤ 100 | Only SF decay observed (1972Ga42,1972Wo07). E(level): Only SF decay observed (1972Ga42,1972Wo07). |
Identification:
1972Wo07: 244Bk was produced by irradiating 243Am with α particles at the Argonne 152 cm cyclotron via the (α,3n) reaction.
1956Ch77: 244Bk was produced by irradiating 243Am with α particles
Theoretical studies:
2009Mo18, 1984Ku05, 1972We09: Calculated fission barrier heights
1997Mo25: Calculated partial half-lives for α and β decays
1995Mo29: Calculated deformation parameters
1972We09: Calculated spontaneous fission half-lives