## Abstract

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 21+ states and B(E2;01+→21+) 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 leads to an enhanced collectivity in the isotopes around N=58.

Original language | English |
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Pages (from-to) | 470-473 |

Number of pages | 4 |

Journal | Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics |

Volume | 717 |

Issue number | 4-5 |

DOIs | |

Publication status | Published - 2012 Oct 31 |

## Keywords

- Collective Hamiltonian
- Covariant energy density functional
- Electromagnetic transition
- Low-lying states
- Sn isotopes

## ASJC Scopus subject areas

- Nuclear and High Energy Physics