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Author  |
Zanon, I. et al; Gadea, A.; Valiente-Dobon, J.J. |
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Title |
Inherited collectivity from shape-coexisting cores in the i13/2 rotational band of 189Hg |
Type |
Journal Article |
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Year |
2026 |
Publication |
Physical Review C |
Abbreviated Journal |
Phys. Rev. C |
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Volume |
114 |
Issue |
5 |
Pages |
054305 - 10pp |
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Abstract |
Background: The neutron-deficient Hg isotopes provide one of the most prominent examples of nuclear shape coexistence. While the even-even nuclei have been extensively investigated, much less is known about how an unpaired neutron influences the evolution of collectivity in the odd-mass isotopes. Purpose: To determine lifetimes of low-spin states in 189Hg and investigate the evolution of collectivity in the rotational band built on the 13/2+ isomer through comparison with neighboring shape-coexisting Hg isotopes. Methods: Excited states in 189Hg were populated in the 160Gd(34S, 5n) 189Hg fusion-evaporation reaction at a beam energy of 185 MeV. The reaction channel of interest was selected by requiring coincidence with at least one neutron detected in the neutron wall array, while prompt gamma rays were measured with the GALILEO spectrometer. Lifetimes of low-lying states above the 13/2+ isomer were measured with the recoil-distance Doppler-shift method using the GALILEO plunger device. The experimental results were compared with total Routhian surface calculations. Results: Lifetimes of the 17/2+, 21/2+, and 25/2+ states were measured for the first time and the corresponding B(E2) strengths were extracted. The excitation energies and transition strengths closely follow the systematics observed in neighboring odd-and even-mass Hg isotopes, supporting the interpretation of the rotational sequence as the coupling of an i13/2 neutron to the weakly oblate structures of the neighboring even-even cores. The extracted B4/2-type ratio is significantly below unity, extending the occurrence of anomalous transition-strength ratios to this odd-mass nucleus. Total Routhian surface calculations reproduce the weakly oblate equilibrium deformation but not the observed evolution of the transition strengths. Conclusions: The present results indicate that the i13/2-based rotational band largely inherits the structural complexity of the neighboring shape-coexisting even-even Hg nuclei. They further demonstrate that electromagnetic transition strengths provide stringent constraints on the evolution of the underlying wave functions beyond those accessible from excitation energies or static mean-field descriptions alone. |
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Address |
[Zanon, I.; Semeraro, S.; John, P. R.; Boso, A.; Cicerchia, M.; Colucci, G.; Lenzi, S. M.; Mengoni, D.; Recchia, F.; Testov, D.] Univ Padua, Dipartimento Fis & Astron, Padua, Italy, Email: msiciliano@anl.gov |
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Publisher |
Amer Physical Soc |
Place of Publication |
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Language |
English |
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ISSN |
2469-9985 |
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Notes |
WOS:001925203400003 |
Approved |
no |
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Is ISI |
yes |
International Collaboration |
yes |
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Call Number |
IFIC @ pastor @ |
Serial |
7523 |
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