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Superfluidity of Σ- hyperons in β-stable neutron star matter

Authors: I. Vidaña & L. Tolós

Ref.: Phys. Rev. C 70, 028802 (2004)

Abstract: In this work we evaluate the S01 energy gap of Σ− hyperons in β-stable neutron star matter. We solve the BCS gap equation for an effective Σ−Σ− pairing interaction derived from the most recent parametrization of the hyperon-hyperon interaction constructed by the Nijmegen group. We find that the Σ− hyperons are in a S01 superfluid state in the density region ∼0.27–0.7fm−3, with a maximum energy gap of order 8MeV at a total baryon number density of ∼0.37fm−3 and a Σ− fraction of about 8%. We examine the implications on neutron star cooling.

DOI: 10.1103/PhysRevC.70.028802