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Article
Report number arXiv:2305.16442
Title Simultaneous γ-ray and electron spectroscopy of Hg182,184,186 isotopes
Author(s) IDS Collaboration  Zeige alle 51 Autoren
Publication 2023-07-06
Imprint 2023-05-25
Number of pages 20
In: Phys. Rev. C 108 (2023) 014308
DOI 10.1103/PhysRevC.108.014308 (publication)
Subject category nucl-th ; Nuclear Physics - Theory ; nucl-ex ; Nuclear Physics - Experiment
Abstract Background: The mercury isotopes around N=104 are a well-known example of nuclei exhibiting shape coexistence. Mixing of configurations can be studied by measuring the monopole strength ρ2(E0), however, currently the experimental information is scarce and lacks precision, especially for the IπIπ (I0) transitions. Purpose: The goals of this study were to increase the precision of the known branching ratios and internal conversion coefficients, to increase the amount of available information regarding excited states in 182,184,186Hg and to interpret the results in the framework of shape coexistence using different models. Method: The low-energy structures in 182,184,186Hg were populated in the β decay of 182,184,186Tl, produced at ISOLDE and purified by laser ionization and mass separation. The γ-ray and internal conversion electron events were detected by five germanium clover detectors and a segmented silicon detector, respectively, and correlated in time to build decay schemes. Results: In total, 193, 178 and 156 transitions, including 144, 140 and 108 observed for the first time in a β-decay experiment, were assigned to 182,184,186Hg, respectively. Internal conversion coefficients were determined for 23 transitions, out of which 12 had an E0 component. Extracted branching ratios allowed the sign of the interference term in 182Hg as well as ρ2(E0;02+01+) and B(E2;02+21+) in 184Hg to be determined. By means of electron-electron coincidences, the 03+ state was identified in 184Hg. The experimental results were qualitatively reproduced by five theoretical approaches, the IBM with configuration mixing with two different parametrizations, the General Bohr Hamiltonian, the BMF model and the SCCM model. However, a quantitative description is lacking.
Copyright/License preprint: (License: arXiv nonexclusive-distrib 1.0)
publication: © 2023-2025 authors (License: CC BY 4.0)



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