Density Dependence of Proton Fraction in Neutron Stars

LI Wen-Fei<SUP1; 2< sup>; ZHANG Feng-Shou<SUP1; CHEN Lie-Wen<SUP1

Chinese Physics C> 2001, Vol. 25> Issue(8) : 759-764

Density Dependence of Proton Fraction in Neutron Stars

LI Wen-Fei ,

CHEN Lie-Wen

Center of Theoretical Nuclear Physics, National Laboratory of Heavy Ion Accelerator, Lanzhou 730000, China2 Institute of Modern Physics, The Chinese Academy of Sciences, Lanzhou 730000, China

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Abstract：
Within the framework of Skyrme-Hartree-Fock theory based on the extended Skyrme effective interaction, the proton fraction in β-stable neutron stars was investigated for the charge neutrality condition. The density dependence of symmetry energy strength coefficient was studied with different potential parameters, and the behavior of proton fraction in neutron stars at high density for these potential parameters was obtained. The calculated results show that the proton fraction disappears at high density for potential parameters SII, SIII and SKM, which implies that the pure neutron matter may exist in the interior of neutron stars. It is also found that adding muons in neutron stars will increase the proton fraction.

References

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. Serot B D,Walecka J D.Adv.Nucl.Phys.,1986,16(1):1. 2. Friedman B,Pandharipande V R.Nucl.Phys.,1981,A361:502. 3. Wiringa R B,Fiks V,Fabrocini A.Phys.Rev.,1988,C38:1010. 4. Bombaci I,Lombardo U.Phys.Rev.,1991,C44(5):1892. 5. Baldo M,Bombaci I,Burgio G F.Astr.Astrophys.,1997,328:274. 6. Donati P.Phys.Rev.Lett.,1994,72(18):2835. 7. Dean D J.Phys.Lett.,1995,B356:429. 8. ZHANG F S,GE L X.Nuclear Multifragmentation,Beijing:Science Press,1998(in Chinese)(张丰收,葛凌霄.原子核多重碎裂,北京:科学出版社,1998)9. ZHANG F S,GE L X.High Energy Phys.and Nucl.Phys.,1992,16(7):666(in Chinese)(张丰收,葛凌霄.高能物理与核物理,1992,16(7):666)10. ZHANG F S.Z.Phys.,1996,A356:16311. Kutschera M,Wojcik W.Phys.Rev.,1993,C47(3):107712. Lattimer J M,Pethick C J,Prakash M et al.Phys.Rev.Lett.,1991,66:2701

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LI Wen-Fei, ZHANG Feng-Shou LI Wen-Fei, ZHANG Feng-Shou shu

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Received: 2000-06-23
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

Density Dependence of Proton Fraction in Neutron Stars

LI Wen-Fei

CHEN Lie-Wen

Center of Theoretical Nuclear Physics, National Laboratory of Heavy Ion Accelerator, Lanzhou 730000, China2 Institute of Modern Physics, The Chinese Academy of Sciences, Lanzhou 730000, China

Received Date: 2000-06-23
Accepted Date: 1900-01-01
Available Online: 2001-08-05

Abstract: Within the framework of Skyrme-Hartree-Fock theory based on the extended Skyrme effective interaction, the proton fraction in β-stable neutron stars was investigated for the charge neutrality condition. The density dependence of symmetry energy strength coefficient was studied with different potential parameters, and the behavior of proton fraction in neutron stars at high density for these potential parameters was obtained. The calculated results show that the proton fraction disappears at high density for potential parameters SII, SIII and SKM, which implies that the pure neutron matter may exist in the interior of neutron stars. It is also found that adding muons in neutron stars will increase the proton fraction.