Enhanced collectivity in neutron-deficient Sn isotopes in energy functional based collective Hamiltonian
- Li, Z. P.
- Li, C. Y.
- Xiang, J.
- Yao, J. M.
- Meng, J.
DOIAbstract
The low-lying collective states in Sn isotopes are studied by a five-dimensional collective Hamiltonian with parameters determined from the triaxial relativistic mean-field calculations using the PC-PK1 energy density functional. The systematics for both the excitation energies of 2(1)(+) states and B (E2: 0(1)(+) -> 2(1)(+)) values are reproduced rather well, in particular, the enhanced E2 transitions in the neutron-deficient Sn isotopes with N <66. We show that the gradual degeneracy of neutron levels 1g(7/2) and 2d(5/2) around the Fermi surface leads to the increase of level density and consequently the enhanced paring correlations from N = 66 to 58. It provokes a large quadrupole shape fluctuation around the spherical shape, and l...
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