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Singlet and Triplet pairing in neutron matter

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Published: Jul 31, 2024
DOI: https://doi.org/10.12681/hnpsanp.6153
Keywords:
Nuclear Astrophysics, Neutron stars, Superfluidity, Neutron Star Cooling
Eckhard Krotscheck
Department of Physics,University at Buffalo
Jiawei Wang
Department of Physics,University at Buffalo
Panagiota Papakonstantinou
Institute for Rare Isotope Science, Institute for Basic Science, Daejeon 34000, Korea
Abstract

The presence of superfluidity in neutron stars can affect the cooling and dynamics of neutron stars in various ways. Model calculations employing realistic nuclear potentials in Bardeen-Cooper-Schrieffer theory generally suggest the development of a 1S0 pairing gap at low densities and a 3P2-3F2 pairing gap at higher densities. We have evaluated the pairing interaction by summing the "parquet" Feynman diagrams which include both ladder and ring diagrams systematically, plus a set of important non-parquet diagrams, making this the most comprehensive diagram-based approach presently available. Our results suggest a modest suppression of the 1S0 pairing gap, a radical suppression of the 3P2-3F2 triplet pairing gap, and an enhancement of 3P0 pairing.

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