ADOPTED LEVELS for 233Bk
Authors: B. Singh, J. K. Tuli, E. Browne | Citation: Nucl. Data Sheets 170, 499 (2020) | Cutoff date: 8-Oct-2020
Full ENSDF file | Adopted Levels (PDF version)
| Q(β-)=-9000 keV 40 | S(n)= 8900 keV SY | S(p)= 740 keV SY | Q(α)= 8290 keV SY | ||
| Reference: 2017WA10 |
| E(level) (keV) | T1/2(level) |
| 0 | 21 s +48-17 % ε = ? % α = ? |
Additional Level Data and Comments:
| E(level) | Jπ(level) | T1/2(level) | Comments |
| 0 | 21 s +48-17 % ε = ? % α = ? | From theoretical α and β decay half-lives of 4.6 s and 9.5 s, respectively in 2019Mo01, α decay is expected to be 68%, and ε+β+ decay as 32%. E(level): From theoretical α and β decay half-lives of 4.6 s and 9.5 s, respectively in 2019Mo01, α decay is expected to be 68%, and ε+β+ decay as 32%. |
2015De22: 233Bk produced and identified in deep-inelastic multinucleon transfer reaction 248Cm(48Ca,X),E(48Ca)=270 MeV from UNILAC at GSI. Target=460 μg/cm2 thick 248Cm oxide deposited on titanium backing. Target-like products were separated using velocity filter SHIP at GSI, and implanted in position-sensitive silicon strip detector. Measured energy, position and time of the implanted nuclei, and their decay products. The α particles and SF fragments from the decay chains were detected by a set of six silicon detectors. The 233Bk nuclide was identified in one decay chain of four successive α decays, the measured α energies and/or half-lives of two such decays can be roughly matched with the literature values for decays of 225Np and 213Fr. 2015De22 and 2018De38 also calculated half-life from theoretical considerations.
The evaluator treats the identification of 233Bk in 2015De22 as tentative since in a long α-decay chain 233Bk to 209At shown in Fig. 2 and Table 1 of 2015De22 from a single correlated event, only one α-decay energy (that from 213Fr α decay) matches that in literature, whereas its half-life of 110 s +250-90 seems in poor agreement with the literature value of 34.8 s
Q-value: Estimated uncertainties (2017Wa10): ΔS(p)=300, ΔQ(α)=210. S(n) from theory (2019Mo01)
Q-value: S(2p)=4130 370, Q(εp)=2230 370 (syst, 2017Wa10). S(2n)=16550 (theory, 2019Mo01)