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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:4 パーセンタイル:55.61(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.
Qian, J.*; Heinz, A.*; Khoo, T. L.*; Janssens, R. V. F.*; Peterson, D.*; Seweryniak, D.*; Ahmad, I.*; 浅井 雅人; Back, B. B.*; Carpenter, M. P.*; et al.
Physical Review C, 79(6), p.064319_1 - 064319_13, 2009/06
被引用回数:31 パーセンタイル:84.39(Physics, Nuclear)アルゴンヌ国立研究所の反跳核分離装置を用いて、Rfの
線,
線,内部転換電子測定実験を行った。
Rfの励起状態に、高いK量子数を持った3準粒子状態と解釈される半減期160
秒の新核異性体を発見した。また、
崩壊の抑止係数より、
Rfの娘核である
Noの1準粒子状態の中性子軌道配位を同定した。中性子数151核の1/2
[620]準位の励起エネルギーの系統性より、中性子数152の変形閉殻の大きさが、原子番号が増えるにつれて大きくなることを明らかにした。