$ ²⁶⁷Hs has been observed in the ²³⁸U(³⁴S,5n) reaction at JINR (1995La20) and GSI (2010Ni14), and as the α-decay daughter of ²⁷¹Ds at GSI (1998Ho13,2011Ho10), LBNL (2003Gi05,2004Fo08), and RIKEN (2004Mo40). Events were identified based on the observation of chains of α-decaying nuclei. The properties of these chains, when compared to the literature, allowed individual decays to be assigned to specific nuclei.

$ Identification of the α-decay energies originating from ²⁷¹Ds (which determine the level energies in ²⁶⁷Hs) has been claimed in various works, but not uniformly. 1998Ho13 identifies E_α=10.738 and E_α=10.681, but 2011Ho10 indicates that only 10.738 was observed. 2004Mo40 identifies E_α=10.73 and E_α=10.45, but not 10.681. 2004Fo08 identifies E_α=10.738, as well as one event which could be assigned to E_α=10.681 or 10.738, but none at E_α=10.45. The present evaluation represents the evaluator’s attempt to reconcile the available data.

$ 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^-)=512, ΔS(n)=99, ΔS(p)=189 (2021Wa16)

Q-value: S(2n)=14385 syst 98, S(2p)=4714 syst 169, Q(εp)=1751 syst 263 (2021Wa16)