TY - JOUR
T1 - Rapid structural change in low-lying states of neutron-rich Sr and Zr isotopes
AU - Mei, H.
AU - Xiang, J.
AU - Yao, J. M.
AU - Li, Z. P.
AU - Meng, J.
PY - 2012/3/20
Y1 - 2012/3/20
N2 - The rapid structural change in low-lying collective excitation states of neutron-rich Sr and Zr isotopes is studied by solving a five-dimensional collective Hamiltonian with parameters determined from both relativistic mean-field and nonrelativistic Skyrme-Hartree-Fock calculations using the PC-PK1 and SLy4 forces, respectively. Pair correlations are treated in the BCS method with either a separable pairing force or a density-dependent zero-range force. The isotope shifts, excitation energies, and electric monopole and quadrupole transition strengths are calculated and compared with corresponding experimental data. The calculated results with both the PC-PK1 and the SLy4 forces exhibit a picture of spherical-oblate-prolate shape transition in neutron-rich Sr and Zr isotopes. However, 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.
AB - The rapid structural change in low-lying collective excitation states of neutron-rich Sr and Zr isotopes is studied by solving a five-dimensional collective Hamiltonian with parameters determined from both relativistic mean-field and nonrelativistic Skyrme-Hartree-Fock calculations using the PC-PK1 and SLy4 forces, respectively. Pair correlations are treated in the BCS method with either a separable pairing force or a density-dependent zero-range force. The isotope shifts, excitation energies, and electric monopole and quadrupole transition strengths are calculated and compared with corresponding experimental data. The calculated results with both the PC-PK1 and the SLy4 forces exhibit a picture of spherical-oblate-prolate shape transition in neutron-rich Sr and Zr isotopes. However, 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.
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U2 - 10.1103/PhysRevC.85.034321
DO - 10.1103/PhysRevC.85.034321
M3 - Article
AN - SCOPUS:84859152271
VL - 85
JO - Physical Review C - Nuclear Physics
JF - Physical Review C - Nuclear Physics
SN - 0556-2813
IS - 3
M1 - 034321
ER -