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

 Full ENSDF file | Adopted Levels (PDF version) 

S(n)= 6800 keV SYS(p)= 2046 keV SYQ(α)= 10870 keV 18
Reference: 2021WA16

General Comments:

$ 271Ds has been observed in the 208Pb(64Ni,n) reaction at GSI (1998Ho13,2011Ho10), LBNL (2003Gi05,2004Fo08), RIKEN (2004Mo40), and HIRFL (2012Zh04). Events were identified based on the observation of chains of α decays correlated in time and position. Comparison of the properties of these chains with the literature allowed individual decays to be assigned to speciifc nuclei.

$ Evidence for the existence of an isomer in 271Ds comes from the observation of α decays with similar energies but very different lifetimes. 2004Mo40 suggests that this isomer is much longer lived than the ground state, to which it decays by internal transition.

$ 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: ΔS(n)=105, ΔS(p)=214 (2021Wa16)

Q-value: S(2n)=15025 syst 102, S(2p)=3119 syst 163, Q(εp)=3551 syst 266 (2021Wa16)

    0 1.6 ms +4-3 
% α = 100
  0+x 69 ms +45-20 

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Additional Level Data and Comments:


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