Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2012-01-17
Phys. Rev. C 85, 034321 (2012)
Physics
Nuclear Physics
Nuclear Theory
10 pages (twocolumn), 10 figures
Scientific paper
10.1103/PhysRevC.85.034321
The rapid structural change in low-lying collective excitation states of neutron-rich Sr and Zr isotopes is tudied by solving a five-dimensional collective Hamiltonian with parameters determined by both relativistic mean-field and non-relativistic Skyrme-Hartree-Fock calculations using the PC-PK1 and SLy4 forces respectively. Pair correlations are treated in BCS method with either a separable pairing force or a density-dependent zero-range force. The isotope shifts, excitation energies, electric monopole and quadrupole transition strengths are calculated and compared with corresponding experimental data. The calculated results with both the PC-PK1 and SLy4 forces exhibit a picture of spherical-oblate-prolate shape transition in neutron-rich Sr and Zr isotopes. Compared with the experimental data, the PC-PK1 (or SLy4) force predicts a more moderate (or dramatic) change in most of the collective properties around N=60. The underlying microscopic mechanism responsible for the rapid transition is discussed.
Li Zhi Peng
Mei Hsien-Hao
Meng Jie
Xiang Jingen
Yao J. M.
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