Spectroscopy of 187Tl: shape coexistence

Abstract

The prompt and delayed $$\gamma $$-ray spectra of 187Tl was studied via the 142Nd(50Cr, 3p2n)187Tl fusion-evaporation reaction at a beam energy of 255 MeV. An enhanced level scheme of 187Tl was established. The collective bands with one-quasiparticle configurations from the $$2f_{7/2}$$, $$1h_{9/2}$$, $$1h_{11/2}$$and $$1i_{13/2}$$orbitals and high-lying structures with possible three-quasiparticle configurations are investigated in terms of the tilted axis cranking covariant density functional theory. At low excitation energy, the rotational bands with one-quasiparticle configurations reflect coexistence of three shapes: prolate, triaxial, and oblate. The possible shapes of two microsecond isomers at high excitation energy are proposed.

Metadata

Item Type:	Article
Authors/Creators:	Guo, C. Y. Zhang, W. Q. Huang, H. Zhang, S. Q. Li, Z. H. Liu, Z. Hua, H. Luo, D. W. Wu, H. Y. Andreyev, A. N. https://orcid.org/0000-0003-2828-0262 Seweryniak, D. Andel, B. Antalic, S. Barzakh, A. E. Block, M. Bronis, A. Carpenter, M. P. Copp, P. Cubiss, J. G. https://orcid.org/0000-0002-5076-8654 Doherty, D. T. (dd768@york.ac.uk) Van Duppen, P. Favier, Z. Giacoppo, F. Kindler, B. Kondev, F. G. Lauritsen, T. Li, X. Q. Lommel, B. Al Monthery, M. Mošať, P. Ni, L. Raison, C. Reviol, W. Savard, G. Stolze, S. Wilson, G. L. (gw713@york.ac.uk) Xu, C. Zhang, J. Z. Zhang, S. Y. Zhou, Z. X.
Copyright, Publisher and Additional Information:	© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2024. This is an author-produced version of the published paper. Uploaded in accordance with the University’s Research Publications and Open Access policy.
Dates:	Accepted: 6 August 2024 Published: 24 August 2024
Institution:	The University of York
Academic Units:	The University of York > Faculty of Sciences (York) > Computer Science (York) The University of York > Faculty of Sciences (York) > Physics (York)
Funding Information:	Funder Grant number SCIENCE AND TECHNOLOGY FACILITIES COUNCIL (STFC) ST/V001035/1
Depositing User:	Pure (York)
Date Deposited:	28 Aug 2024 09:40
Last Modified:	20 Sep 2025 02:16
Published Version:	https://doi.org/10.1140/epja/s10050-024-01395-3
Status:	Published
Refereed:	Yes
Identification Number:	10.1140/epja/s10050-024-01395-3
Related URLs:	http://www.scopus.com/inward/record.url?...
Open Archives Initiative ID (OAI ID):	oai:eprints.whiterose.ac.uk:216530

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Spectroscopy of 187Tl: shape coexistence

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