Nanosecond isomers and the evolution of collectivity in stable, even-A Hg isotopes

Suman, Saket; Tandel, S. K.; Kumawat, Ankit; Wahid, S. G.; Hemalatha, M.; Chowdhury, P.; Janssens, R. V. F.; Carpenter, M. P.; Khoo, T. L.; Kondev, F. G.; Lauritsen, T.; Lister, C. J.; Seweryniak, D.; Zhu, S.

doi:10.1103/physrevc.103.014319

Title: Nanosecond isomers and the evolution of collectivity in stable, even-A Hg isotopes

Journal Article · Mon Jan 25 00:00:00 EST 2021 · Physical Review C

DOI:https://doi.org/10.1103/physrevc.103.014319· OSTI ID:1764062

Suman, Saket ^[1];

^[2]; Kumawat, Ankit ^[1]; Wahid, S. G. ^[1]; Hemalatha, M. ^[1]; Chowdhury, P. ^[3];

^[4]; Carpenter, M. P. ^[5]; Khoo, T. L. ^[5];

^[5]; Lauritsen, T. ^[5]; Lister, C. J. ^[6]; Seweryniak, D. ^[5]; Zhu, S. ^[7]

Univ. of Mumbai (India)
Univ. of Mumbai (India); Univ. of Massachusetts, Lowell, MA (United States)
Univ. of Massachusetts, Lowell, MA (United States)
Univ. of North Carolina, Chapel Hill, NC (United States); Duke Univ., Durham, NC (United States)
Argonne National Lab. (ANL), Argonne, IL (United States)
Univ. of Massachusetts, Lowell, MA (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
Argonne National Lab. (ANL), Argonne, IL (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)

Isomeric states and associated collective structures have been studied up to high spin in ^198,200,202Hg using multinucleon transfer reactions and the Gammasphere array. A coupled rotational band, with possible four-quasiparticle character, is established in ¹⁹⁸Hg. Sequences built on two-quasiparticle, positive- and negative-parity levels are assigned to ²⁰²Hg. New isomers in ²⁰²Hg with I^π = (7^–) and (9^–), and T_1/2 = 10.4(4) ns and 1.4(3) ns, respectively, have been identified. A half-life of 1.0(3) ns is established for the I^π = 12⁺ state in ²⁰⁰Hg. B(E2) values deduced from isomeric transitions in Hg isotopes indicate that, while collectivity near the ground state gradually diminishes from N = 112 to N = 124, it is found to increase for the 12⁺ and 9^– states up to N = 118, followed by a reduction for higher neutron numbers. Calculations using the ultimate cranker code provide insight into the variation of deformation with spin and allow for an understanding of observed band crossings. As a result, the evolution of collectivity with spin, and along the isotopic chain, is described.

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Research Organization:: University of North Carolina, Chapel Hill, NC (United States); Argonne National Lab. (ANL), Argonne, IL (United States). Argonne Tandem Linac Accelerator System (ATLAS)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP); Government of India; University Grants Commission

Award DOI(s):: https://doi.org/10.1103/PhysRevC.103.014319
Awarding Organization: DOE-NP

Grant/Contract Number:: FG02-97ER41041; FG02-94ER40848; FG02-94ER40834; FG02-97ER41033; AC02-06CH11357

OSTI ID:: 1764062

Alternate ID(s):: OSTI ID: 1774510

Journal Information:: Physical Review C, Vol. 103, Issue 1; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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