Shape-phase transitions in odd-mass gamma-soft nuclei with mass A ≈ 130

Scientific paper - Original scientific paper

• Author: Kosuke Nomura
• Author: Tamara Nikšić; MBZ: 234533
• Author: Dario Vretenar; MBZ: 9570
• Author's institution: University of Zagreb; Faculty of Science
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Physics

Abstract (english)

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 A≈130, 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.

• Keywords (english): nuclear energy density functional; quantum phase transitions; collective levels
• Language: english
• Publication type: Scientific paper - Original scientific paper
• Publication status: Published
• Peer review: Peer review - international
• Publication version: Published version
• Journal title: Physical Review C
• Numbering: vol. 96, no. 1, 014304
• p-ISSN: 2469-9985
• e-ISSN: 2469-9993
• DOI: https://doi.org/10.1103/PhysRevC.96.014304
• URN:NBN: urn:nbn:hr:217:331848
• Publication: 2017
• Project: Number: IP-2014-09-9159; Title (croatian): Struktura i dinamika egzotičnih femto-sustava; Acronym: STRUDEF; Leader: Nils Paar; Jurisdiction: Croatia; Funding stream: IP
• Document URL: https://journals.aps.org/prc/abstract/10.1103/PhysRevC.96.014304
• Type of resource: Text
• Access conditions: Open access
• Public note: © 2017 American Physical Society. Received 24 April 2017. Published 7 July 2017.
• Created on: 2020-02-29 17:56:42