Superfluidity in neutron matter and symmetric nuclear matter and the effect of a microscopic three-body force

摘要

The neutron 3PF2 pairing gap in pure neutron matter,neutron 3PF2 gap and neutron-proton 3SD1 gap in symmetric nuclear matter have been studied by using the Brueckner-Hartree-Fock(BHF) approach and the BCS theory.We have concentrated on investigating and discussing the three-body force effect on the nucleon superfluidity.The calculated results indicate that the three-body force enhances remarkably the 3PF2 superfluidity in neutron matter.It also enhances the 3PF2 superfluidity in symmetric nuclear matter and its effect increases monotonically as the Fermi-momentum KF increases,whereas the three-body force is shown to influence only weakly the neutron-proton 3SD1 gap in symmetric nuclear matter.