ADOPTED LEVELS for 277Hs
Author: C. Morse | Citation: Nucl. Data Sheets 182, 167 (2022) | Cutoff date: 14-Sep-2021
Full ENSDF file | Adopted Levels (PDF version)
| Q(β-)=-1633 keV SY | S(n)= 4882 keV SY | S(p)= 4864 keV SY | Q(α)= 9030 keV SY | ||
| Reference: 2021WA16 |
| References: | |||
| A | 281Ds α decay (12 S) | ||
| E(level) (keV) | XREF | T1/2(level) |
| 0 | A | 3 ms +15-1 % SF = 100 % α ≤ 50 |
Additional Level Data and Comments:
| E(level) | Jπ(level) | T1/2(level) | Comments |
$ Only a single event has been observed to produce 277Hs. It was observed as the α-decay daughter of 281Ds at GSI (2011Ga19) as part of a chain of α-decaying nuclei terminated by spontaneous fission. Agreement between the properties of the prior decays in the chain with those in the literature allowed a positive identification of 277Hs.
$ 2012Ho12 tentatively identifies one chain (#1) including 277Hs, but this assignment was later revised in 2016Ho09.
$ Other: One decay chain containing 277Hs is reported in 1999Og10, but these results have not been reproduced.
$ Half-lives, branching ratios, and α-decay energies in this evaluation have been computed from the individual events listed in the references above. Half-life uncertainties have been computed according to the method of 1984Sc13. An additional 10 keV systematic uncertainty is assumed for the α-decay energies, which is added in quadrature to the averaged statistical uncertainty.
Q-value: ΔQ(β-)=799, ΔS(n)=848, ΔS(p)=748, ΔQ(α)=200 (2021Wa16)
Q-value: S(2n)=11260 syst 743 (2021Wa16)