Beyond mean-field approach for pear-shaped hypernuclei

作     者：HaoJie Xia XianYe Wu Hua Mei JiangMing Yao 

作者机构：School of Mechanical and Electrical Engineering Handan University College of Physics and Communication Electronics Jiangxi Normal University Department of Physics and Astronomy University of North Carolina Chapel Hill Department of Physics Tohoku University FRIB/NSCL Michigan State University 

出 版 物：《Science China(Physics,Mechanics & Astronomy)》 (中国科学：物理学、力学、天文学（英文版）)

年 卷 期：2019年第62卷第4期

页      面：57-64页

核心收录：

学科分类：07[理学] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0704[理学-天文学] 

基　　金：supported by the National Natural Science Foundation of China(Grant No.11575148) the support by the Scientific Discovery through Advanced Computing(SciDAC)program funded by the U.S.Department of Energy,Office of Science,Office of Advanced Scientific Computing Research and Office of Nuclear Physics,under Award Number DE-SC0008641(NUCLEI SciDAC Collaboration) 

主　　题：hypernucleus relativistic mean field octupole deformation cluster structure 

摘      要：We develop both relativistic mean field and beyond approaches for hypernuclei with possible quadrupole-octupole deformation or pear-like shapes based on relativistic point-coupling energy density functionals. The symmetries broken in the mean-field states are recovered with parity, particle-number and angular momentum projections. We take_Λ^(21)Ne as an example to illustrate the method, where the Λ hyperon is put on one of the two lowest-energy orbits(labeled as Λ_s, Λ_p), respectively. We find that the Λ hyperon in both cases disfavors the formation of a reflection-asymmetric molecular-like^(16)O+α structure in^(20)Ne, which is consistent with the Nilsson diagram for the hyperon in(β_2, β_3) deformation plane. In particular, we show that the negative-parity states with the configuration^(20)Ne(K~π= 0^-)  Λ_s are close in energy to those with the configuration^(20)Ne(K~π= 0^+)Λ_p, even though they have very different structures. The Λ_s(Λ_p) becomes more and more concentrated around the bottom(top) of thepear with the increase of octupole deformation.