Author: C. Morse |  Citation: Nucl. Data Sheets 182, 130 (2022). |  Cutoff date: 14-Sep-2021 

 Full ENSDF file | Adopted Levels (PDF version) 

Q(β-)=-5133 keV SYS(n)= 6553 keV SYS(p)= 2736 keV SYQ(α)= 10038 keV 13
Reference: 2021WA16

  A  271Ds α decay (1.6 MS) 

General Comments:

$ 267Hs has been observed in the 238U(34S,5n) reaction at JINR (1995La20) and GSI (2010Ni14), and as the α-decay daughter of 271Ds at GSI (1998Ho13,2011Ho10), LBNL (2003Gi05,2004Fo08), and RIKEN (2004Mo40). Events were identified based on the observation of chains of α-decaying nuclei. The properties of these chains, when compared to the literature, allowed individual decays to be assigned to specific nuclei.

$ Identification of the α-decay energies originating from 271Ds (which determine the level energies in 267Hs) has been claimed in various works, but not uniformly. 1998Ho13 identifies Eα=10.738 and Eα=10.681, but 2011Ho10 indicates that only 10.738 was observed. 2004Mo40 identifies Eα=10.73 and Eα=10.45, but not 10.681. 2004Fo08 identifies Eα=10.738, as well as one event which could be assigned to Eα=10.681 or 10.738, but none at Eα=10.45. The present evaluation represents the evaluator’s attempt to reconcile the available data.

$ 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-)=512, ΔS(n)=99, ΔS(p)=189 (2021Wa16)

Q-value: S(2n)=14385 syst 98, S(2p)=4714 syst 169, Q(εp)=1751 syst 263 (2021Wa16)

XREF T1/2(level)
    0A 43 ms +9-6 
% α = 100
    8E1 2 A  
    3.2E2 2 A  
    X  0.8 s +40-4 

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Additional Level Data and Comments:


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