期刊
PHYSICAL REVIEW C
卷 97, 期 3, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevC.97.031301
关键词
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资金
- Croatian Government
- Major State 973 Program of China [2013CB834400]
- Research Fund for the Doctoral Program of Higher Education [20110001110087]
- European Union through the European Regional Development Fund - the Competitiveness and Cohesion Operational Programme [KK.01.1.1.01]
- QuantiXLie Centre of Excellence
- NSFC [11475140, 11575148, 11335002, 11621131001]
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 even-even 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.
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