Solving the Puzzles of the Decay of the Heaviest Known Proton-Emitting Nucleus 185Bi

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.; Müller-Gatermann, C.; Potterveld, D.; Reviol, W.; Savard, G.; Stolze, S.; Zhu, S.

doi:10.1103/physrevlett.127.202501

Solving the Puzzles of the Decay of the Heaviest Known Proton-Emitting Nucleus ¹⁸⁵Bi

Journal Article · Thu Nov 11 23:00:00 EST 2021 · Physical Review Letters

DOI:https://doi.org/10.1103/physrevlett.127.202501· OSTI ID:1829996

^[1]; ^[2]; Seweryniak, D. ^[3]; Woods, P. J. ^[4]; Carpenter, M. P. ^[3]; Auranen, K. ^[5]; Ayangeakaa, A. D. ^[6]; Back, B. B. ^[3]; ^[7]; Canete, L. ^[8]; ^[9]; ^[10]; Haylett, T. ^[9]; Huang, T. ^[11]; ^[6]; Jenkins, D. G. ^[9]; Kondev, F. G. ^[3]; Lauritsen, T. ^[3]; Lederer-Woods, C. ^[4]; Li, J. ^[3] more »

Univ. of Surrey, Guildford (United Kingdom); Univ. of York (United Kingdom); Univ of NC - Chapel Hill
Univ. of York (United Kingdom); Japan Atomic Energy Agency, Ibaraki (Japan)
Argonne National Lab. (ANL), Argonne, IL (United States)
Univ. of Edinburgh (United Kingdom)
Argonne National Lab. (ANL), Argonne, IL (United States); Univ. of Jyvaskyla (Finland)
Univ. of North Carolina, Chapel Hill, NC (United States); Duke Univ., Durham, NC (United States)
Argonne National Lab. (ANL), Argonne, IL (United States); Universita degli Studi di Milano and INFN (Italy)
Univ. of Surrey, Guildford (United Kingdom)
Univ. of York (United Kingdom)
Argonne National Lab. (ANL), Argonne, IL (United States); Univ. of Maryland, College Park, MD (United States)
Argonne National Lab. (ANL), Argonne, IL (United States); Chinese Academy of Sciences, Lanzhou (China)

Two long-standing puzzles in the decay of ¹⁸⁵Bi, the heaviest known proton-emitting nucleus are revisited. These are the non-observation of the 9/2^– state, which is the ground state of all heavier odd-A Bi isotopes, and the hindered nature of proton and α decays of its presumed 60-μs 1/2⁺ ground state. The ¹⁸⁵Bi nucleus has now been studied with the ⁹⁵Mo(⁹³Nb; 3n) reaction in complementary experiments using the Fragment Mass Analyzer and Argonne Gas-Filled Analyzer at Argonne National Laboratory’s ATLAS facility. The experiments have established the existence of two states in ¹⁸⁵Bi; the short-lived T_1/2 = $2.8$$$$^{+2.3}_{–1.0}$$ μs, proton- and α-decaying ground state, and a 58(2)–μs γ-decaying isomer, the half-life of which was previously attributed to the ground state. The reassignment of the ground-state lifetime results in a proton-decay spectroscopic factor close to unity and represents the only known example of a ground-state proton decay to a daughter nucleus (¹⁸⁴Pb) with a major shell closure. Furthermore, the data also demonstrate that the ordering of low- and high-spin states in ¹⁸⁵Bi is reversed relative to the heavier odd-A Bi isotopes, with the intruder-based 1/2⁺ configuration becoming the ground state, similar to the lightest At nuclides.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of North Carolina, Chapel Hill, NC (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP)

Grant/Contract Number:: AC02-06CH11357; FG02-97ER41041; FG02-97ER41033

OSTI ID:: 1829996

Alternate ID(s):: OSTI ID: 1840698

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 20 Vol. 127; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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