Issue
EPL
Volume 84, Number 3, November 2008
Article Number 32001
Number of page(s) 6
Section Nuclear Physics
DOI http://dx.doi.org/10.1209/0295-5075/84/32001
Published online 17 October 2008
EPL, 84 (2008) 32001
DOI: 10.1209/0295-5075/84/32001

Isospin dependence of nucleon 3PF2 superfluidity in asymmetric nuclear matter

W. Zuo1, A. J. Mi1, 2, C. X. Cui1 and U. Lombardo3

1   Institute of Modern Physics, Chinese Academy of Sciences - 730000 Lanzhou, China
2   School of Nuclear Science and Technology, Lanzhou University - 730000 Lanzhou, China
3   Università di Catania - Catania I-95123, Italy, EU

zuowei@impcas.ac.cn

received 7 August 2008; accepted in final form 19 September 2008; published November 2008
published online 17 October 2008

Abstract
We have investigated the isospin dependence of the neutron and proton 3PF2 superfluidity in isospin-asymmetric nuclear matter within the framework of the Brueckner-Hartree-Fock approach and the BCS theory. We show that the 3PF2 neutron and proton pairing gaps depend sensitively on isospin asymmetry of asymmetric nuclear matter. As the isospin asymmetry increases, the neutron 3PF2 superfluidity becomes stronger and the peak value of the neutron 3PF2 pairing gap increases rapidly. The isospin dependence of the proton 3PF2 superfluidity is shown to be opposite to the neutron one. The proton 3PF2 superfluidity becomes weaker at a higher asymmetry and it even vanishes at high enough asymmetries. At high asymmetries, the neutron 3PF2 superfluidity turns out to be much stronger than the proton one, implying that the neutron 3PF2 superfluidity is dominated in the highly asymmetric dense interior of neutron stars.

PACS
21.65.-f - Nuclear matter.
21.65.Cd - Asymmetric matter, neutron matter.
26.60.-c - Nuclear matter aspects of neutron stars.

© EPLA 2008