Massive neutron stars and A-hypernuclei in relativistic mean field models  

作　　者：孙亭亭 夏铖君 张时声 M.S.Smith 

机构地区：[1]School of Physics and Engineering and Henan Key Laboratory of Ion Beam Bioengineering, Zhengzhou University, Zhengzhou 450001, China [2]School of Information Science and Engineering, Ningbo Institute of Technology, Zhejiang University, Ningbo 315100, China [3]CAS Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100190, China [4]School of Physics and Nuclear Energy Engineering, Beihang University, Beijing 100191, China [5]Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee, 37831-6354, USA

出　　处：《Chinese Physics C》2018年第2期136-143,共8页中国物理C（英文版）

基　　金：Supported by National Natural Science Foundation of China(11525524,11505157,11375022,11705163,11621131001);National Key Basic Research Program of China(2013CB834400);the Physics Research and Development Program of Zhengzhou University(32410017);the Office of Nuclear Physics in the U.S.Dept.of Energy;supported by the HPC Cluster of SKLTP/ITP-CAS;the Supercomputing Center,CNIC,of the CAS

摘　　要：Based on relativistic mean field（RMF） models, we study finite A-hypernuclei and massive neutron stars. The effective N-N interactions PK1 and TM1 are adopted, while the N-A interactions are constrained by reproducing the binding energy of A-hyperon at 1 s orbit of Λ^40Ca. It is found that the A-meson couplings follow a simple relation, indicating a fixed A potential well for symmetric nuclear matter at saturation densities, i.e., around VΛ=-29.786 MeV. With those interactions, a large mass range of Λ-hypernuclei can be described well. Furthermore,the masses of PSR J1614-2230 and PSR J0348＋0432 can be attained adopting the Λ-meson couplings gσΛ/gσN≥0.73,gωΛ/gωN≥0.80 for PK1 and gσΛ/gσN≥0.81,gωΛ/gωN≥0.90 for TM1, respectively. This resolves the hyperon puzzle without introducing any additional degrees of freedom.Based on relativistic mean field（RMF） models, we study finite A-hypernuclei and massive neutron stars. The effective N-N interactions PK1 and TM1 are adopted, while the N-A interactions are constrained by reproducing the binding energy of A-hyperon at 1 s orbit of Λ^40Ca. It is found that the A-meson couplings follow a simple relation, indicating a fixed A potential well for symmetric nuclear matter at saturation densities, i.e., around VΛ=-29.786 MeV. With those interactions, a large mass range of Λ-hypernuclei can be described well. Furthermore,the masses of PSR J1614-2230 and PSR J0348＋0432 can be attained adopting the Λ-meson couplings gσΛ/gσN≥0.73,gωΛ/gωN≥0.80 for PK1 and gσΛ/gσN≥0.81,gωΛ/gωN≥0.90 for TM1, respectively. This resolves the hyperon puzzle without introducing any additional degrees of freedom.

关 键 词：massive neutron stars A-hypernuclei relativistic mean field theory 

分 类 号：P145.6[天文地球—天体物理]