Simultaneous γ-ray and electron spectroscopy of 182,184,186Hg isotopes
IDS Collaboration. (2023). Simultaneous γ-ray and electron spectroscopy of 182,184,186Hg isotopes. Physical Review C, 108(1), Article 014308. https://doi.org/10.1103/PhysRevC.108.014308
Julkaistu sarjassa
Physical Review CTekijät
Päivämäärä
2023Tekijänoikeudet
© Published by the American Physical Society
2023:50 | 2024:49 | 2025:2
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 Iπ→Iπ (I≠0) 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, CERN 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;0+2→0+1) and B(E2;0+2→2+1) in 184Hg to be determined. By means of electron-electron coincidences, the 0+3 state was identified in 184Hg. The experimental results were qualitatively reproduced by five theoretical approaches, the interacting boson model with configuration mixing with two different parametrizations, the general Bohr Hamiltonian, the beyond mean-field model, and the symmetry-conserving configuration-mixing model. However, a quantitative description is lacking.
Conclusions: The presence of shape coexistence in neutron-deficient mercury isotopes was confirmed and evidence for the phenomenon existing at higher energies was found. The new experimental results provide important spectroscopic input for future Coulomb excitation studies.
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Julkaisija
American Physical Society (APS)ISSN Hae Julkaisufoorumista
2469-9985Asiasanat
Julkaisu tutkimustietojärjestelmässä
https://converis.jyu.fi/converis/portal/detail/Publication/183976994
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Rahoittaja(t)
Euroopan komissio; Suomen AkatemiaRahoitusohjelmat(t)
Akatemiahanke, SA
The content of the publication reflects only the author’s view. The funder is not responsible for any use that may be made of the information it contains.
Lisätietoja rahoituksesta
We acknowledge the support of the ISOLDE Collaboration and technical teams. This project has received funding from the European Union's Horizon 2020 research and innovation programme Grant Agreements No. 654002 (ENSAR2), 665779, and 771036 (CoG MAIDEN). T.R.R. acknowledges the computing resources and assistance provided by GSI-Darmstadt and CCC-UAM. This work has been funded by FWO-Vlaanderen (Belgium), by GOA/2015/010 (BOF KU Leuven), by the Interuniversity Attraction Poles Programme initiated by the Belgian Science Policy Office (BriX network P7/12), by the Slovak Research and Development Agency (Contract No. APVV-18-0268), by the Slovak Grant Agency VEGA (Contract No. 1/0651/21), by Spanish Grants No. FPA2015-64969-P, FPA2015-65035-P, FPA2017-87568-P, FPA2017-83946-C2-1-P, RTI2018-098868-B-I00, PPID2019-104002GB-C21, PID2019-104390GB-I00, PID2019-104714GB-C21, and PID2019-104002GB-C21 funded by MCIN/AEI/10.13039/50110001103 and “ERDF A way of making Europe” and by European Regional Development Fund, ref. no. SOMM17/6105/UGR, by Science and Technology Facilities Council (STFC) of the UK Grant No. ST/R004056/1, ST/P005314/1, ST/P003885/1, ST/V001035/1, ST/P004598/1, and ST/V001027/1, by the Bundesministerium für Bildung und Forschung under contract no. 05P21PKCI1, by the Institute of Atomic Physics project CERN-RO/ISOLDE, by the Polish Ministry of Education and Science under Contract No. 2021/WK/07 and by the Academy of Finland (Finland) Grant No. 307685. ...Lisenssi
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