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

 Full ENSDF file | Adopted Levels (PDF version) 

Q(β-)=-1785 keV SYS(n)= 5179 keV SYS(p)= 4656 keV SYQ(α)= 8.58×103 keV 7
Reference: 2021WA16

  A  273Hs α decay (0.51 S) 

General Comments:

$ 269Sg has been observed as the α-decay daughter of 273Hs at LBNL (2010El06) and JINR (2015Ut02,2018Ut02). Events were identified by the observation of chains of α-decaying nuclei, terminated by spontaneous fission. Comparison of the properties of these chains with those in the literature allowed individual decays to be assigned to specific nuclei.

$ 2018Ut02 lists one decay of 269Sg with a lifetime of 6486 s. Including it increases the average lifetime by nearly an order of magnitude, and on this basis it is excluded.

$ 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-)=525, ΔS(n)=596, ΔS(p)=645 (2021Wa16)

Q-value: S(2n)=12257 syst 452, S(2p)=8330 syst 682 (2021Wa16)

XREF T1/2(level)
  0A 1.3×102 s +10-4 
% α = 100
% SF < 15

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Additional Level Data and Comments:


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