TL;DR
This paper reviews how nucleon pairing affects neutron star cooling and discusses recent observational evidence from Cassiopeia A that suggests pairing occurs at supra-nuclear densities, providing insights into neutron star interior physics.
Contribution
It summarizes the impact of nucleon pairing on neutron star cooling and links recent observations to direct evidence of pairing at high densities.
Findings
Observation of rapid cooling in Cassiopeia A neutron star
Evidence for neutron 3P-F2 energy gap around 0.1 MeV
Implication of pairing effects on neutron star thermal evolution
Abstract
In this review, I present a brief summary of the impact of nucleon pairing at supra-nuclear densities on the cooling of neutron stars. I also describe how the recent observation of the cooling of the neutron star in the supernova remnant Cassiopeia A may provide us with the first direct evidence for the occurrence of such pairing. It also implies a size of the neutron 3P-F2 energy gap of the order of 0.1 MeV.
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