Nuclear quantum shape-phase transitions in odd-mass systems

Quan, S. and Li, Z. P. and Vretenar, Dario and Meng, J. (2018) Nuclear quantum shape-phase transitions in odd-mass systems. Physical Review C, 97 (3). 31301(R)-6. ISSN 2469-9985

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Microscopic signatures of nuclear ground-state shape-phase transitions in odd-mass Eu isotopes are explored starting from excitation spectra and collective wave functions obtained by diagonalization of a core-quasiparticle coupling Hamiltonian based on energy density functionals. As functions of the physical control parameter—the number of nucleons—theoretical low-energy spectra, two-neutron separation energies, charge isotope shifts, spectroscopic quadrupole moments, and E2 reduced transition matrix elements accurately reproduce available data and exhibit more-pronounced discontinuities at neutron number N = 90 compared with the adjacent eveneven Sm and Gd isotopes. The enhancement of the first-order quantum phase transition in odd-mass systems can be attributed to a shape polarization effect of the unpaired proton which, at the critical neutron number, starts predominantly coupling to Gd core nuclei that are characterized by larger quadrupole deformation and weaker proton pairing correlations compared with the corresponding Sm isotopes.

Item Type: Article
Date: 2018
Subjects: NATURAL SCIENCES > Physics
Additional Information: © 2018 American Physical Society. Received 14 November 2017; revised manuscript received 2 January 2018; published 2 March 2018.
Divisions: Faculty of Science > Department of Physics
Publisher: American Physical Society
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 21 Mar 2018 15:37
Last Modified: 22 Mar 2018 14:02

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