ADOPTED LEVELS for 269Sg
Author: C. Morse | Citation: Nucl. Data Sheets 182, 167 (2022) | Cutoff date: 14-Sep-2021
Full ENSDF file | Adopted Levels (PDF version)
| Q(β-)=-1785 keV SY | S(n)= 5179 keV SY | S(p)= 4656 keV SY | Q(α)= 8.58×103 keV 7 | ||
| Reference: 2021WA16 |
| References: | |||
| A | 273Hs α decay (0.51 S) | ||
| E(level) (keV) | XREF | T1/2(level) |
| 0 | A | 1.3×102 s +10-4 % α = 100 % SF < 15 |
Additional Level Data and Comments:
| E(level) | Jπ(level) | T1/2(level) | Comments |
$ 269Sg has been observed as the α-decay daughter of 273Hs at LBNL (2010El06) and JINR (2015Ut02,2018Ut02). Events were identified by the observation of chains of α-decaying nuclei, terminated by spontaneous fission. Comparison of the properties of these chains with those in the literature allowed individual decays to be assigned to specific nuclei.
$ 2018Ut02 lists one decay of 269Sg with a lifetime of 6486 s. Including it increases the average lifetime by nearly an order of magnitude, and on this basis it is excluded.
$ 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-)=525, ΔS(n)=596, ΔS(p)=645 (2021Wa16)
Q-value: S(2n)=12257 syst 452, S(2p)=8330 syst 682 (2021Wa16)