Quadrupole and octupole collectivity in the semi-magic nucleus <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.svg"><mml:msubsup><mml:mrow /><mml:mrow><mml:mn>80</mml:mn></mml:mrow><mml:mrow><mml:mn>206</mml:mn></mml:mrow></mml:msubsup></mml:math>Hg126


Morrison, L, Hadyńska-Klȩk, K, Podolyák, Zs, Gaffney, LP ORCID: 0000-0002-2938-3696, Zielińska, M, Brown, BA, Grawe, H, Stevenson, PD, Berry, T, Boukhari, A et al (show 34 more authors) (2023) Quadrupole and octupole collectivity in the semi-magic nucleus <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.svg"><mml:msubsup><mml:mrow /><mml:mrow><mml:mn>80</mml:mn></mml:mrow><mml:mrow><mml:mn>206</mml:mn></mml:mrow></mml:msubsup></mml:math>Hg126. Physics Letters B, 838. p. 137675.

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Abstract

The first low-energy Coulomb-excitation measurement of the radioactive, semi-magic, two proton-hole nucleus 206Hg, was performed at CERN's recently-commissioned HIE-ISOLDE facility. Two γ rays depopulating low-lying states in 206Hg were observed. From the data, a reduced transition strength B(E2;21+→01+)=4.4(6) W.u. was determined, the first such value for an N=126 nucleus south of 208Pb, which is found to be slightly lower than that predicted by shell-model calculations. In addition, a collective octupole state was identified at an excitation energy of 2705 keV, for which a reduced B(E3) transition probability of 30−13+10 W.u. was extracted. These results are crucial for understanding both quadrupole and octupole collectivity in the vicinity of the heaviest doubly-magic nucleus 208Pb, and for benchmarking a number of theoretical approaches in this key region. This is of particular importance given the paucity of data on transition strengths in this region, which could be used, in principle, to test calculations relevant to the astrophysical r-process.

Item Type: Article
Divisions: Faculty of Science and Engineering > School of Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 05 May 2023 09:07
Last Modified: 05 May 2023 09:07
DOI: 10.1016/j.physletb.2023.137675
Open Access URL: https://doi.org/10.1016/j.physletb.2023.137675
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URI: https://livrepository.liverpool.ac.uk/id/eprint/3170213
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