Author: C. Morse |  Citation: Nucl. Data Sheets 182, 167 (2022) |  Cutoff date: 14-Sep-2021 

 Full ENSDF file | Adopted Levels (PDF version) 

Q(β-)=-1633 keV SYS(n)= 4882 keV SYS(p)= 4864 keV SYQ(α)= 9030 keV SY
Reference: 2021WA16

  A  281Ds α decay (12 S) 

General Comments:

$ Only a single event has been observed to produce 277Hs. It was observed as the α-decay daughter of 281Ds at GSI (2011Ga19) as part of a chain of α-decaying nuclei terminated by spontaneous fission. Agreement between the properties of the prior decays in the chain with those in the literature allowed a positive identification of 277Hs.

$ 2012Ho12 tentatively identifies one chain (#1) including 277Hs, but this assignment was later revised in 2016Ho09.

$ Other: One decay chain containing 277Hs is reported in 1999Og10, but these results have not been reproduced.

$ 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-)=799, ΔS(n)=848, ΔS(p)=748, ΔQ(α)=200 (2021Wa16)

Q-value: S(2n)=11260 syst 743 (2021Wa16)

XREF T1/2(level)
  0A 3 ms +15-1 
% SF = 100
% α ≤ 50

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Additional Level Data and Comments:


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