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Doherty, D. T.*; Andreyev, A. N.; Seweryniak, D.*; Woods, P. J.*; Carpenter, M. P.*; Auranen, K.*; Ayangeakaa, A. D.*; Back, B. B.*; Bottoni, S.*; Canete, L.*; et al.
Physical Review Letters, 127(20), p.202501_1 - 202501_6, 2021/11
被引用回数:8 パーセンタイル:67.41(Physics, Multidisciplinary)Bi is the heaviest known proton emitting isotope. Its decay had been observed, but the assumed ground-state lifetime (s) was incorrect, leading to unexplained hindrance. With two new experiments at Argonne National Laboratory, two states were clearly identified. One is the proton-emitting ground-state (spin 1/2, half-life: 2.8 s), the second is a 58(2) s -decaying isomer. The new data show the inversion of the ground and isomeric states compared to neighboring Bi isotopes. This is the only known example of a ground-state proton decay to a daughter nucleus (Pb) with a major shell closure.