ADOPTED LEVELS for 277Mt
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 SY | S(n)= 6376 keV SY | S(p)= 2466 keV SY | Q(α)= 9900 keV SY | ||
| Reference: 2021WA16 |
| References: | |||
| A | 281Rg α decay (15 S) | ||
| E(level) (keV) | XREF | T1/2(level) |
| 0 | A | 4 ms +4-1 % SF = 100 % α ≤ 20 |
Additional Level Data and Comments:
| E(level) | Jπ(level) | T1/2(level) | 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)