Triplet pairing in neutron matter in a comprehensive diagrammatic approach

Abstract

We apply a large-scale summation of Feynman diagrams, including the class of parquet diagrams plus important contributions outside the parquet class, for calculating effective pairing interactions and subsequently the superfluid gap in P-wave pairing in neutron matter. We use realistic nucleon-nucleon interactions of the $v_8$ type and perform calculations up to a Fermi momentum of 1.8 fm${}^{-1}$. We find that many-body correlations lead to a strong reduction of the spin-orbit interaction, and, therefore, to a radical suppression of the ${}^3{P}_2{-}^3{F}_2$ gap and an enhancement of the ${}^3{P}_0$ gap.

Comments: 2 pages incl. 3 figures; contribution to the Proceedings of the International Nuclear Physics Conference 2025, Daejeon, South Korea, May 2025