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

 Full ENSDF file | Adopted Levels (PDF version) 

Q(β-)=-1242 keV SYS(n)= 4885 keV SYS(p)= 5069 keV SYQ(α)= 8748 keV SY
Reference: 2021WA16

  A  275Hs α decay (0.20 S) 

General Comments:

$ 271Sg has been observed as the α-decay daughter of 275Hs at JINR (2004Og12,2006Og05) and GSI (2012Ho12). Chains of α-decaying nuclei were observed which terminated in spontaneous fission. The properties of these chains were compared to the literature in order to assign individual decays to specific nuclei.

$ 2016Ho09 revises chain #1 in 2012Ho12 to begin with 291Lv. An additional α decay was also identified, such that the decay labeled as 277Hs is actually 271Sg.

$ 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-)=705, ΔS(n)=748, ΔS(p)=824, ΔQ(α)=138 (2021Wa16)

Q-value: S(2n)=11218 syst 696 (2021Wa16)

XREF T1/2(level)
  0A 96 s +88-31 
% α = 50
% SF = 50

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Additional Level Data and Comments:


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