Microscopic core-quasiparticle coupling model for spectroscopy of odd-mass nuclei with octupole correlations

W. Sun, S. Quan, Z. P. Li, J. Zhao, T. Nikšić, and D. Vretenar
Phys. Rev. C 100, 044319 – Published 24 October 2019
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Abstract

Background: Predictions of spectroscopic properties of low-lying states are critical for nuclear structure studies. Theoretical methods can be particularly involved for odd-mass nuclei because of the interplay between the unpaired nucleon and collective degrees of freedom. Only a few models have been developed for systems in which octupole collective degrees of freedom play a role.

Purpose: We aim to predict spectroscopic properties of odd-mass nuclei characterized by octupole shape deformation, employing a model that describes single-particle and collective degrees of freedom within the same microscopic framework.

Method: A microscopic core-quasiparticle coupling (CQC) model based on the covariant density functional theory is developed, which includes collective excitations of even-mass core nuclei and single-particle states of the odd nucleon, calculated using a quadrupole-octupole collective Hamiltonian combined with a constrained reflection-asymmetric relativistic Hartree-Bogoliubov model.

Results: Model predictions for low-energy excitation spectra and transition rates of odd-mass radium isotopes Ra223,225,227 are shown to be in good agreement with available data.

Conclusions: A microscopic CQC model based on covariant density functional theory has been developed for odd-mass nuclei characterized by both quadrupole and octupole shape deformations. Theoretical results reproduce data in odd-mass Ra isotopes and provide useful predictions for future studies of octupole correlations in nuclei and related phenomena.

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  • Received 16 July 2019

DOI:https://doi.org/10.1103/PhysRevC.100.044319

©2019 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

Authors & Affiliations

W. Sun1, S. Quan1, Z. P. Li1,2,*, J. Zhao3, T. Nikšić4, and D. Vretenar4

  • 1School of Physical Science and Technology, Southwest University, Chongqing 400715, China
  • 2Department of Physics and Electronic Science, Qiannan Normal University for Nationalities, Duyun 558000, China
  • 3Microsystem and Terahertz Research Center and Insititute of Electronic Engineering, China Academy of Engineering Physics, Chengdu 610200, Sichuan, China
  • 4Physics Department, Faculty of Science, University of Zagreb, Bijenička Cesta 32, Zagreb 10000, Croatia

  • *zpliphy@swu.edu.cn

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Issue

Vol. 100, Iss. 4 — October 2019

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