Possible shape coexistence in Ne isotopes and the impurity effect of Λ hyperon  

作　　者：Chen Chen Qian-Kun Sun Yu-Xiao Li Ting-Ting Sun 

机构地区：[1]School of Physics and Microelectronics,Zhengzhou University,Zhengzhou 450001,China

出　　处：《Science China(Physics,Mechanics & Astronomy)》2021年第8期29-40,共12页中国科学：物理学、力学、天文学（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant No.U2032141);the Natural Science Foundation of Henan Province(Grant Nos.202300410479,and 202300410480);the Foundation of Fundamental Research for Young Teachers of Zhengzhou University(Grant No.JC202041041);the Physics Research and Development Program of Zhengzhou University(Grant No.32410217);supported by the nuclear data storage system in Zhengzhou University。

摘　　要：The possible shape coexistence in even-even Ne isotopes and the impurity effects of the sΛ and pΛ hyperons are explored employing the multidimensionally constrained relativistic-mean-field(MDC-RMF) model with the PK1 parameter set for the N N interaction and PK1-Y1 for the ΛN interaction. The quadrupole deformation potential energy surfaces(PESs), nuclear deformations, nuclear radii, binding energies, and density distributions of the hypernuclei and core nuclei are examined. The possible shape coexistence in ^(24,26,28)Ne is predicted with small energy differences of 140, 336, and 128 keV, respectively, between the two local energy minima. Different impurity effects of the sΛand pΛ hyperons are revealed. The sΛ hyperon exhibits clear shrinkage effects, which reduce the nuclear size and facilitate a spherical nuclear shape. The prolate pΛhyperon on the 1/2^(-)[110] orbital renders the nuclear shape more prolate, while the oblate pΛ hyperon on the 3/2^(-)[101] or 1/2^(-)[101] orbital renders the nuclei more oblate. Moreover, the Λ hyperon can increase the probabilities of the shape coexistence by reducing the energy differences between the two local energy minima, although the shape coexistence may disappear owing to the vanishment of one energy minimum on the flat energy surface.

关 键 词：single-Λhypernuclei shape coexistence impurity effects Ne isotope 

分 类 号：O571[理学—粒子物理与原子核物理]