Anatomy of octupole correlations in 96Zr with a symmetry-restored multidimensionally-constrained covariant density functional theory

A recent analysis based on the STAR measurement in relativistic heavy-ion collision experiments provides evidence of octupole correlation in the ground state of 96Zr, the description of which presents a challenge to nuclear structure models. In this work, we perform projection-after-variation calcul...

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Bibliographic Details
Published inPhysics letters. B Vol. 840; p. 137896
Main Authors Rong, Yu-Ting, Wu, Xian-Ye, Lu, Bing-Nan, Yao, Jiang-Ming
Format Journal Article
LanguageEnglish
Published Elsevier B.V 10.05.2023
Elsevier
Subjects
96Zr
Low-lying collective states
Octupole deformations
Projected multidimensionally-constrained relativistic Hartree-Bogoliubov model
Octupole deformations
Low-lying collective states
Projected multidimensionally-constrained relativistic Hartree-Bogoliubov model
96Zr
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Summary:A recent analysis based on the STAR measurement in relativistic heavy-ion collision experiments provides evidence of octupole correlation in the ground state of 96Zr, the description of which presents a challenge to nuclear structure models. In this work, we perform projection-after-variation calculations for 96Zr based on a multidimensionally-constrained relativistic Hartree-Bogoliubov model. Our results show that an octupole deformed shape is favored in energy after symmetry restoration, and this phenomenon cannot be reproduced in the pure mean-field calculations. These complex structures originate from the competition among various shell structures in this mass region. Our results suggest that the allowance of symmetry breaking at the mean-field level and the restoration of broken symmetries are essential elements for understanding the structure of 96Zr in density functional theories.
ISSN:0370-2693
1873-2445
DOI:10.1016/j.physletb.2023.137896