Proton Fraction in Neutron Stars  

作　　者：ZHANG Feng-Shou CHEN Lie-Wen 张丰收;陈列文(Center of Theoretical Nuclear Physics,National Laboratory of Heavy Ion Accelerator,Lanzhou 730000;Institute of Modern Physics,Chinese Academy of Sciences,Lanzhou 730000;CCAST(World Laboratory),P.O.Box 8730,Beijing 100080)

机构地区：[1]Center of Theoretical Nuclear Physics,National Laboratory of Heavy Ion Accelerator,Lanzhou 730000 [2]Institute of Modern Physics,Chinese Academy of Sciences,Lanzhou 730000 [3]CCAST(World Laboratory),P.O.Box 8730,Beijing 100080

出　　处：《Chinese Physics Letters》2001年第1期142-144,共3页中国物理快报（英文版）

基　　金：Supported by the National Natural Science Foundation of China under Grant Nos.19875068 and 19847002;the Major State Basic Research Development Program under Contract No.G2000077407;the Foundation of the Chinese Academy of Sciences.

摘　　要：The proton fraction inβ-stable neutron stars is investigated within the framework of the Skyrme-Hartree-Fock theory using the extended Skyrme effective interaction for the first time.The calculated results show that the proton fraction disappears at high density,which implies that the pure neutron matter may exist in the interior of neutron stars.The incompressibility of the nuclear equation-of-state is shown to be more important to determine the proton fraction.Meanwhile,it is indicated that the addition of muons in neutron stars will change the proton fraction.It is also found that the higher-order terms of the nuclear symmetry energy have obvious effects on the proton fraction and the parabolic law of the nuclear symmetry energy is not enough to determine the proton fraction.

关 键 词：SYMMETRY implies INTERIOR 

分 类 号：O57[理学—粒子物理与原子核物理]