Possible shape coexistence in odd-A Ne isotopes and the impurity effects ofΛhyperons  

作　　者：Qian-Kun Sun Ting-Ting Sun Wei Zhang Shi-Sheng Zhang Chen Chen 孙乾坤;孙亭亭;张炜;张时声;陈晨(School of Physics and Microelectronics,Zhengzhou University,Zhengzhou 450001,China;School of Physics and Nuclear Energy Engineering,Beihang University,Beijing 100191,China;School of Nuclear Science and Technology,Lanzhou University,Lanzhou 730000,China)

机构地区：[1]School of Physics and Microelectronies,Zhengzhou University,Zhengzhou 450001,China [2]School of Physics and Nuclear Energy Engineering,Beihang University,Beijing 100191,China [3]School of Nuclear Science and Technology,Lanzhou University,Lanzhou 730000,China

出　　处：《Chinese Physics C》2022年第7期138-148,共11页中国物理C（英文版）

基　　金：Supported by the National Natural Science Foundation of China(U2032141);the Natural Science Foundation of Henan Province(202300410479);the Foundation of Fundamental Research for Young Teachers of Zhengzhou University(JC202041041);the Physics Research and Development Program of Zhengzhou University(32410217)。

摘　　要：In this study, shape evolution and possible shape coexistence are explored in odd-A Ne isotopes in the framework of the multidimensionally constrained relativistic-mean-field(MDC-RMF)model. By introducing ~sΛ and phyperons, the impurity effects on the nuclear shape, energy, size, and density distribution are investigated.For the NN interaction, the PK1 parameter set is adopted, and for the ΛN interaction, the PK1-Y1 parameter set is used. The nuclear ground state and low-lying excited states are determined by blocking the unpaired odd neutron in different orbitals around the Fermi surface. Moreover, the potential energy curves(PECs), quadrupole deformations,nuclear r.m.s. radii, binding energies, and density distributions for the core nuclei as well as the corresponding hy pernuclei are analyzed. By examining the PECs, possibilities for shape coexistence inNe and a triple shape coexistence inNe are found. In terms of the impurity effects ofΛhyperons, as noted for even-even Ne hypernuclear isotopes, the shyperon exhibits a clear shrinkage effect, which reduces the nuclear size and results in a more spherical nuclear shape. The phyperon occupying the 1/2~-[110]orbital is prolate, which causes the nuclear shape to be more prolate, and the phyperon occupying the 3/2~-[101] orbital displays an oblate shape, which drives the nuclei to be more oblate.

关 键 词：HYPERNUCLEI shape coexistence impurity effects Ne isotope 

分 类 号：O571[理学—粒子物理与原子核物理]