TY - JOUR
T1 - Enhanced collectivity in neutron-deficient Sn isotopes in energy functional based collective Hamiltonian
AU - Li, Z. P.
AU - Li, C. Y.
AU - Xiang, J.
AU - Yao, J. M.
AU - Meng, J.
N1 - Funding Information:
This work was supported in part by the Major State 973 Program 2013CB834400 , the NSFC under Grant Nos. 10975008 , 10947013 , 11175002 , 11105110 , and 11105111 , the Research Fund for the Doctoral Program of Higher Education under Grant No. 20110001110087 , the Southwest University Initial Research Foundation Grant to Doctor (Nos. SWU110039 , SWU109011 ), the Fundamental Research Funds for the Central Universities ( XDJK2010B007 and DJK2011B002 ), European community grant ENSAR .
PY - 2012/10/31
Y1 - 2012/10/31
N2 - 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.
AB - 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.
KW - Collective Hamiltonian
KW - Covariant energy density functional
KW - Electromagnetic transition
KW - Low-lying states
KW - Sn isotopes
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U2 - 10.1016/j.physletb.2012.09.061
DO - 10.1016/j.physletb.2012.09.061
M3 - Article
AN - SCOPUS:84867729003
SN - 0370-2693
VL - 717
SP - 470
EP - 473
JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
IS - 4-5
ER -