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 SYS(n)= 6546 keV SYS(p)= 3502 keV SYQ(α)= 9274 keV SY
Reference: 2021WA16

  A  273Ds α decay (0.19 MS) 

General 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)

XREF T1/2(level)
  0A 13 s +10-4 
% α = 100
% SF < 5

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Additional Level Data and Comments:


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