Chinese Physics C > 2003, Vol. 27 > Issue(12): 1084-1088

Properties of Isospin Asymmetric Nuclear Matter and Extended BHF Approach (Ⅶ) Proton and Neutron¹S₀Superfluidity in Neutron Star Matter

Institute of Modern Physics,CAS,Lanzhou 730000,China

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Abstract：
The proton and neutron ¹S ₀pairing gaps in β-stable neutron star matter have been studied by using the isospin dependent Brueckner-Hartree-Fock approach and the BCS theory. We have concentrated on investigating and discussing the effect of three-body force. The calculated results indicate that the three-body force has only a small effect on the neutron ¹S ₀superfluidity in β-stable neutron matter, i.e., it leads to a small reduction of the neutron 1S 0 paring gap. However the three-body force not only suppresses strongly the strength of the proton ¹S ₀superfluidity in β-stable neutron star matter but also reduces largely the density domain for the proton ¹S ₀superfluidity phase from ρ _B<0.45fm _－3to ρ _B<0.3fm _－3. It is also shown that the three-body force enhances largely the proton fraction in β-stable neutron star matter at high densities.

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LI Zeng-Hua, LU Guang-Cheng and ZUO Wei. Properties of Isospin Asymmetric Nuclear Matter and Extended BHF Approach (Ⅶ) Proton and Neutron ¹S ₀Superfluidity in Neutron Star Matter[J]. Chinese Physics C, 2003, 27(12): 1084-1088.

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Received: 2003-02-26
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

Properties of Isospin Asymmetric Nuclear Matter and Extended BHF Approach (Ⅶ) Proton and Neutron¹S₀Superfluidity in Neutron Star Matter

Corresponding author:ZUO Wei,

Institute of Modern Physics,CAS,Lanzhou 730000,China

Received Date:2003-02-26
Accepted Date:1900-01-01
Available Online:2003-12-05

Abstract:The proton and neutron¹S₀pairing gaps in β-stable neutron star matter have been studied by using the isospin dependent Brueckner-Hartree-Fock approach and the BCS theory. We have concentrated on investigating and discussing the effect of three-body force. The calculated results indicate that the three-body force has only a small effect on the neutron¹S₀superfluidity in β-stable neutron matter, i.e., it leads to a small reduction of the neutron 1S 0 paring gap. However the three-body force not only suppresses strongly the strength of the proton¹S₀superfluidity in β-stable neutron star matter but also reduces largely the density domain for the proton¹S₀superfluidity phase from ρ_B<0.45fm_－3to ρ_B<0.3fm_－3. It is also shown that the three-body force enhances largely the proton fraction in β-stable neutron star matter at high densities.