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Report No.

Solving the puzzles of the decay of the heaviest known proton-emitting nucleus $$^{185}$$Bi

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.*; Cubiss, J. G.*; Harker, J.*; Haylett, T.*; Huang, T.*; Janssens, R. V. F.*; Jenkins, D. G.*; Kondev, F. G.*; Lauritsen, T.*; Lederer-Woods, C.*; Li, J.*; M$"u$ller-Gatermann, C.*; Potterveld, D.*; Reviol, W.*; Savard, G.*; Stolze, S.*; Zhu, S.*

$$^{185}$$Bi is the heaviest known proton emitting isotope. Its decay had been observed, but the assumed ground-state lifetime ($$sim$$$$60~mu$$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$$^{+2.3}_{-1.0}$$ $$mu$$s), the second is a 58(2) $$mu$$s $$gamma$$-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 ($$^{184}$$Pb) with a major shell closure.



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Category:Physics, Multidisciplinary



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