ADOPTED LEVELS for 241Bk
Author: C.D. Nesaraja | Citation: Nucl. Data Sheets 130, 183 (2015) | Cutoff date: 30-Sep-2015
Full ENSDF file | Adopted Levels (PDF version)
| Q(β-)=-3290 keV SY | S(n)= 7700 keV SY | S(p)= 2980 keV SY | Q(α)= 7040 keV SY | ||
| Reference: 2012WA38 |
| E(level) (keV) | Jπ(level) | T1/2(level) |
| 0.0 | (7/2+) | 4.6 m 4 % α = ? % ε = ? |
| 51 4 | (3/2-) | |
| 82 6 | (5/2-) | |
| 128 7 | (7/2-) |
E(level): Excited levels are reported only in 245Es α decay
Jπ(level): Systematics suggests that the g.s. has configuration 7/2[633] or 3/2[521]. On the basis of the hindrance factors for the α branches to levels at 51, 82 and 128 keV, these levels are assigned to a rotational band, and based on the energy spacing, this band is probably 3/2[521] with the level at 51 keV being the band head. The g.s. is thus probably 7/2[633]
| E(level) (keV) | Jπ(level) | T1/2(level) | |||||
| Band 1 - 7/2[633] STATE. | |||||||
| 0.0 | (7/2+) | 4.6 m 4 % α = ? % ε = ? | |||||
| E(level) (keV) | Jπ(level) | T1/2(level) | |||||
| Band 2 - 3/2[521] band. | |||||||
| 51 4 | (3/2-) | ||||||
| 82 6 | (5/2-) | ||||||
| 128 7 | (7/2-) | ||||||
Additional Level Data and Comments:
| E(level) | Jπ(level) | T1/2(level) | Comments |
| 0.0 | (7/2+) | 4.6 m 4 % α = ? % ε = ? | E(level): 7/2[633] STATE. |
| 51 | (3/2-) | E(level): 3/2[521] band. | |
| 82 | (5/2-) | E(level): 3/2[521] band. | |
| 128 | (7/2-) | E(level): 3/2[521] band. |
Experimental Studies:
2003As01, 2001AsZY: 241Bk was produced and identified from 239Pu(6Li,4n) at the JAERI tandem accelerator facility. The ions were mass separated using the gas-jet couple online separator. Observed Cm K, and L x-rays associated with 241Bk ε through x-γ ray coin.
1989Ha27, 1973Es01, 1967Mi06: Alphas from the decay of 245Es were measured with Si(Au) surface detectors
Theoretical/Systematical Studies:
2011Sh13: Calculation of cluster radioactivity half-life
2004Be10: Calculated single-quasiparticle level energies using the self-consistent microscopic calculations with Gogny force
2004Pa40: Calculated deformation parameters and the proton one quasiparticle states of heaviest nuclei using the macroscopic-microscopic approach
Q-value: Δ(Q(β-))=260, Δ(S(n))=250, Δ(S(p))=200 and Δ(Q(α))=210 (syst, 2012Wa38)