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

 Full ENSDF file | Adopted Levels (PDF version) 

Q(β-)=-2084 keV SYS(n)= 6376 keV SYS(p)= 2466 keV SYQ(α)= 9900 keV SY
Reference: 2021WA16

  A  281Rg α decay (15 S) 

General Comments:

$ 277Mt has been observed as the α-decay daughter of 281Rg at JINR (2013Og04) and GSI (2019Kh04). Events were identified by the observation of chains of correlated α-decays terminated by spontaneous fission. Individual decays were assigned to specific nuclei by comparing the properties of the observed chains to those previously observed in the literature.

$ Both 2013Og04 and 2019Kh04 note that it is possible that 277Mt undergoes electron-capture or β+ decay, in which case the observed spontaneous-fission activity would be due to 277Hs.

$ 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-)=770, ΔS(n)=850, ΔS(p)=979, ΔQ(α)=100 (2021Wa16)

Q-value: S(2n)=11901 syst 767, S(2p)=7350 syst 894 (2021Wa16)

XREF T1/2(level)
  0A 4 ms +4-1 
% SF = 100
% α ≤ 20

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Additional Level Data and Comments:


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