Ojala, Joonas, Pakarinen, Janne, Papadakis, Philippos et al. (37 more authors) (2022) Reassigning the shapes of the 0+ states in the 186Pb nucleus. Communications Physics. 213. ISSN 2399-3650
Abstract
Across the physics disciplines, the 186Pb nucleus is the only known system, where the two first excited states, together with the ground state, form a triplet of zero-spin states assigned with prolate, oblate and spherical shapes. Here we report on a precision measurement where the properties of collective transitions in 186Pb were determined in a simultaneous in-beam γ-ray and electron spectroscopy experiment employing the recoil-decay tagging technique. The feeding of the 02+ state and the interband 22+→21+ transition have been observed. We also present direct measurement of the energies of the electric monopole transitions from the excited 0+ states to the 0+ ground state. In contrast to the earlier understanding, the obtained reduced transition probability B(E2;21+→02+) value of 190(80) W.u., the transitional quadrupole moment ∣Qt(21+→02+)∣=7.7(33) eb and intensity balance arguments provide evidence to reassign the 02+ and 03+ states with predominantly prolate and oblate shape, respectively. Our work demonstrates a step-up in experimental sensitivity and paves the way for systematic studies of electric monopole transitions in this region. These electric monopole transitions probe the nuclear volume in a unique manner and provide unexploited input for development of the next-generation energy density functional models.
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Copyright, Publisher and Additional Information: | © The Author(s) 2022 | ||||||||
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Institution: | The University of York | ||||||||
Academic Units: | The University of York > Faculty of Social Sciences (York) > Education (York) The University of York > Faculty of Sciences (York) > Physics (York) The University of York > Faculty of Arts and Humanities (York) > Philosophy (York) |
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Depositing User: | Pure (York) | ||||||||
Date Deposited: | 09 Sep 2022 11:50 | ||||||||
Last Modified: | 04 Feb 2024 01:19 | ||||||||
Published Version: | https://doi.org/10.1038/s42005-022-00990-4 | ||||||||
Status: | Published | ||||||||
Refereed: | Yes | ||||||||
Identification Number: | https://doi.org/10.1038/s42005-022-00990-4 | ||||||||
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Description: Reassigning the shapes of the 0+ states in the 186Pb nucleus
Licence: CC-BY 2.5