Signatures of shape phase transitions in odd-mass nuclei

Nomura, Kosuke and Nikšić, Tamara and Vretenar, Dario (2016) Signatures of shape phase transitions in odd-mass nuclei. Physical Review C, 94 (6). pp. 64310-12. ISSN 2469-9985

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Abstract

Quantum phase transitions between competing ground-state shapes of atomic nuclei with an odd number of protons or neutrons are investigated in a microscopic framework based on nuclear energy density functional theory and the particle-plus-boson-core coupling scheme. The boson-core Hamiltonian, as well as the single-particle energies and occupation probabilities of the unpaired nucleon, are completely determined by constrained self-consistent mean-field calculations for a specific choice of the energy density functional and paring interaction, and only the strength parameters of the particle-core coupling are adjusted to reproduce selected spectroscopic properties of the odd-mass system. We apply this method to odd-A Eu and Sm isotopes with neutron number N≈90, and explore the influence of the single unpaired fermion on the occurrence of a shape phase transition. Collective wave functions of low-energy states are used to compute quantities that can be related to quantum order parameters: deformations, excitation energies, E2 transition rates, and separation energies, and their evolution with the control parameter (neutron number) is analyzed.

Item Type: Article
Keywords: nuclear energy density functionals, interacting boson-fermion model, nuclear spectroscopy
Date: 2016
Subjects: NATURAL SCIENCES > Physics
Additional Information: ©2016 American Physical Society. Received 26 September 2016. Revised manuscript received 9 November 2016. Published 8 December 2016.
Divisions: Faculty of Science > Department of Physics
Project code: IP-2014-09-9159
Publisher: American Physical Society
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 16 Sep 2017 16:21
Last Modified: 16 Sep 2017 16:23
URI: http://digre.pmf.unizg.hr/id/eprint/5559

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