ADOPTED LEVELS for 269Hs
Author: C. Morse | Citation: Nucl. Data Sheets 182, 167 (2022) | Cutoff date: 14-Sep-2021
Full ENSDF file | Adopted Levels (PDF version)
Q(β-)=-4807 keV SY | S(n)= 6546 keV SY | S(p)= 3502 keV SY | Q(α)= 9274 keV SY | ||
Reference: 2021WA16 |
References: | |||
A | 273Ds α decay (0.19 MS) |
E(level) (keV) | XREF | T1/2(level) |
0 | A | 13 s +10-4 % α = 100 % SF < 5 |
Additional Level Data and Comments:
E(level) | Jπ(level) | T1/2(level) | Comments |
$ 269Hs has been observed as the α-decay daughter of 273Ds at GSI (1996Ho13,2002Ho11) and RIKEN (2007Mo09,2013Su04); and in gas-phase chemistry experiments at GSI (2002Du21,2004Vo24,2006Dv01,2008Dv02). Chains of α-decaying nuclei were observed, and comparison of the decay properties of the chains with those in the literature allowed individual decays to be assigned to specific nuclei.
$ 1996Ho13 reports two decay chains, but a reanalysis of the data in 2002Ho11 showed that one of the chains was reported in error.
$ 2006Dv01 suggests that all studies prior to that work that identify 270Hs have actually observed 269Hs, based on a previously unknown isomer in 261Rf.
$ 1996La12 claims observation of several chains that should decay through 269Hs, but the decay properties do not seem to agree with other publications.
$ 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-)=338, ΔS(n)=327, ΔS(p)=404, ΔQ(α)=167 (2021Wa16)
Q-value: S(2n)=14307 syst 162, S(2p)=5891 syst 292, Q(εp)=405 syst 487 (2021Wa16)