Enhanced collectivity in neutron-deficient Sn isotopes in energy functional based collective Hamiltonian

Enhanced collectivity in neutron-deficient Sn isotopes in energy functional based collective Hamiltonian
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基于能量泛函的集体哈密顿量中缺中子 Sn 同位素的集体性增强

DOI:
10.1016/j.physletb.2012.09.061
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发表时间:
2012-09
期刊:
影响因子:
4.4
通讯作者:
Meng, J.
Meng, J.
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Li, Z. P.;Li, C. Y.;Xiang, J.;Yao, J. M.;Meng, J.

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Sn 同位素中的低位集体态通过五维集体哈密顿量进行研究,其参数是使用 PC-PK1 能量密度泛函通过三轴相对论平均场计算确定的。 21+态的激发能和B(E2;01+→21+)值的系统学都得到了很好的再现,特别是N<66的缺中子Sn同位素中增强的E2跃迁。我们发现,费米面周围的中子能级 1g7/2 和 2d5/2 的逐渐简并导致能级密度的增加,从而增强了从 N=66 到 58 的配对相关性。它在球形周围引起了大的四极形状涨落,并导致 N=58 周围同位素的集体性增强。
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 1g7/2and 2d5/2around 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.
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