Odd-even parity splittings and octupole correlations in neutron-rich Ba isotopes

被引：20

作者：

Fu, Y. ^{[1
]}

Wang, H. ^{[1
]}

Wang, L. -J. ^{[2
]}

Yao, J. M. ^{[2
,3
]}

机构：

[1] Guizhou Minzu Univ, Sch Mechatron Engn, Guiyang 550001, Guizhou, Peoples R China

[2] Univ N Carolina, Dept Phys & Astron, Chapel Hill, NC 27516 USA

[3] Michigan State Univ, FRIB NSCL Lab, E Lansing, MI 48824 USA

来源：

PHYSICAL REVIEW C | 2018年 / 97卷 / 02期

基金：

中国国家自然科学基金;

关键词：

HARTREE-BOGOLIUBOV THEORY; MEAN-FIELD APPROACH; REFLECTION ASYMMETRY; NUCLEAR-STRUCTURE; BARIUM ISOTOPES; ATOMIC-NUCLEI; GROUND-STATE; DEFORMATION; SHAPE;

D O I：

10.1103/PhysRevC.97.024338

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

The odd-even parity splittings in low-lying parity-doublet states of atomic nuclei with octupole correlations have usually been interpreted as rotational excitations on top of octupole vibration in the language of collective models. In this paper, we report a deep analysis of the odd-even parity splittings in the parity-doublet states of neutron-rich Ba isotopes around neutron number N = 88 within a full microscopic framework of beyond-meanfield multireference covariant energy density functional theory. The dynamical correlations related to symmetry restoration and quadrupole-octupole shape fluctuation are taken into account with a generator coordinate method combined with parity, particle-number, and angular-momentum projections. We show that the behavior of oddeven parity splittings is governed by the interplay of rotation, quantum tunneling, and shape evolution. Similar to Ra-224, a picture of rotation-induced octupole shape stabilization in the positive-parity states is exhibited in the neutron-rich Ba isotopes.

引用

页数：7

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