Spin-related Component Of Effective Interaction In Nuclear Matter

Nuclear force is one of the fundamental topics in nuclear physics,while the spin-dependence is an important property of nuclear interaction.Based on the density-dependent relativistic Hartree-Fock theory,the two-body interaction matrix elements for the spin-related component embedded in the Fock terms were derived and decomposed in partial wave helicity states in the isovector-pseudovectorπ-PV,isoscalar-vectorω-V（isovector-tensorρ-T）coupling chan-nels,in particular its spin-,momentum-,density-dependence.In detail,the rel-ativistic effect were investigated in the nuclear matter system.It is found that in relativistic case,the spin-related component ofπ-PV coupling channel mainly acts on the³P₁state,while the spin-related component ofω-V coupled channel is equally important in the³P₁and¹S₀states.In non-relativistic case,the spin-related components ofπ-PV andω-V coupling channels are strictly zero in the¹S₀state.In addition,taking the second-and fourth-order symmetry energies as ex-amples,the influence of spin-related component in effective interaction on the bulk properties of nuclear matter is studied.It is found that the spin-dependent interaction,especially those from the isoscalar meson coupling channels,re-duces（enhances）the density dependence of the second-order（fourth-order）symmetry energy.