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

 Full ENSDF file | Adopted Levels (PDF version) 

Q(β-)=-2275 keV SYS(n)= 4985 keV SYS(p)= 4559 keV SYQ(α)= 9.45×103 keV 5
Reference: 2021WA16

  A  279Ds α decay (0.216 S) 

General Comments:

$ 275Hs has been observed as the α-decay daughter of 279Ds at JINR (2004Og12,2006Og05) and GSI (2012Ho12). Chains of α-decaying nuclei, terminated by spontaneous fission, were observed and compared to previously published data to assign each decay to specific nuclei.

$ 2016Ho09 revises the assignment of chain #1 in 2012Ho12 to begin with 291Lv, and identifies a missing α decay. Thus, what is labeled 281Ds in that chain actually corresponds to 275Hs.

$ 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-)=709, ΔS(n)=756, ΔS(p)=828 (2021Wa16)

Q-value: S(2n)=11418 syst 701, S(2p)=8006 syst 715 (2021Wa16)

XREF T1/2(level)
  0A 0.20 s +19-7 
% α = 100
% SF ≤ 20

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Additional Level Data and Comments:

  0 0.20 s +19-7 
% α = 100
% SF ≤ 20
Assumed ground state.
E(level): Assumed ground state.

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