https://doi.org/10.1140/epja/s10050-024-01395-3
Regular Article – Experimental Physics
Spectroscopy of 187Tl: shape coexistence
1
School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, 100871, Beijing, China
2
Institute of Modern Physics, Chinese Academy of Sciences, 730000, Lanzhou, China
3
University of Chinese Academy of Sciences, 100049, Beijing, China
4
Key Laboratory of Nuclear Data, China Institute of Atomic Energy, 102413, Beijing, China
5
School of Physics, Engineering and Technology, University of York, YO10 5DD, York, UK
6
Advanced Science Research Center (ASRC), Japan Atomic Energy Agency, Tokai-mura, Japan
7
Physics Division, Argonne National Laboratory, 60439, Argonne, IL, USA
8
Department of Nuclear Physics and Biophysics, Comenius University in Bratislava, 84248, Bratislava, Slovakia
9
KU Leuven, Instituut voor Kern-en Stralingsfysica, 3001, Leuven, Belgium
10
Petersburg Nuclear Physics Institute, NRC Kurchatov Institute, 188300, Gatchina, Russia
11
Helmholtz-Institut Mainz, 55128, Mainz, Germany
12
GSI Helmholtzzentrum für Schwerionenforschung Darmstadt, 64291, Darmstadt, Germany
13
Johannes-Gutenberg Universität, 55099, Mainz, Germany
14
Department of Physics, University of Surrey, GU2 7XH, Guildford, UK
15
Physics Department, CERN, 1211, Geneva 23, Switzerland
16
Department of Physics and Astronomy, Louisiana State University, 70803, Baton Rouge, LA, USA
e
zhli@pku.edu.cn
f
liuzhong@impcas.ac.cn
Received:
26
May
2024
Accepted:
6
August
2024
Published online:
24
August
2024
The prompt and delayed 
-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 
, 
, 
and 
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.
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© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2024. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
