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Spectroscopy of 187Tl: shape coexistence

The prompt and delayed γ -ray spectra of 187 Tl was studied via the 142 Nd( 50 Cr, 3 p 2 n ) 187 Tl fusion-evaporation reaction at a beam energy of 255 MeV. An enhanced level scheme of 187 Tl was established. The collective bands with one-quasiparticle configurations from the 2 f 7 / 2 , 1 h 9 / 2 ,...

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Published in:The European physical journal. A, Hadrons and nuclei Hadrons and nuclei, 2024-08, Vol.60 (8), Article 165
Main Authors: 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., Seweryniak, D., Andel, B., Antalic, S., Barzakh, A. E., Block, M., Bronis, A., Carpenter, M. P., Copp, P., Cubiss, J. G., Doherty, D. T., 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., Xu, C., Zhang, J. Z., Zhang, S. Y., Zhou, Z. X.
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Language:English
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Summary:The prompt and delayed γ -ray spectra of 187 Tl was studied via the 142 Nd( 50 Cr, 3 p 2 n ) 187 Tl fusion-evaporation reaction at a beam energy of 255 MeV. An enhanced level scheme of 187 Tl was established. The collective bands with one-quasiparticle configurations from the 2 f 7 / 2 , 1 h 9 / 2 , 1 h 11 / 2 and 1 i 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.
ISSN:1434-601X
1434-6001
1434-601X
DOI:10.1140/epja/s10050-024-01395-3