Shape-phase transitions in odd-mass γ-soft nuclei with mass A130

K. Nomura, T. Nikšić, and D. Vretenar
Phys. Rev. C 96, 014304 – Published 7 July 2017

Abstract

Quantum phase transitions between competing equilibrium shapes of nuclei with an odd number of nucleons are explored using a microscopic framework of nuclear energy density functionals and a fermion-boson coupling model. The boson Hamiltonian for the even-even core nucleus, as well as the spherical single-particle energies and occupation probabilities of unpaired nucleons, are completely determined by a constrained self-consistent mean-field calculation for a specific choice of the energy density functional and pairing interaction. Only the strength parameters of the particle-core coupling have to be adjusted to reproduce a few empirical low-energy spectroscopic properties of the corresponding odd-mass system. The model is applied to the odd-A Ba, Xe, La, and Cs isotopes with mass A130, for which the corresponding even-even Ba and Xe nuclei present a typical case of γ-soft nuclear potential. The theoretical results reproduce the experimental low-energy excitation spectra and electromagnetic properties, and confirm that a phase transition between nearly spherical and γ-soft nuclear shapes occurs also in the odd-A systems.

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  • Received 24 April 2017

DOI:https://doi.org/10.1103/PhysRevC.96.014304

©2017 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

Authors & Affiliations

K. Nomura1,2, T. Nikšić1, and D. Vretenar1

  • 1Physics Department, Faculty of Science, University of Zagreb, 10000 Zagreb, Croatia
  • 2Center for Computational Sciences, University of Tsukuba, Tsukuba 305-8577, Japan

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Issue

Vol. 96, Iss. 1 — July 2017

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