Singlet pairing gaps of neutrons and protons in hyperonic neutron stars

Abstract

The ${}^1{S}_0$ nucleonic superfluids are investigated within the relativistic mean-field model and Bardeen-Cooper-Schrieffer theory in hyperonic neutron stars. The ${}^1{S}_0$ pairing gaps of neutrons and protons are calculated based on the Reid soft-core interaction as the nucleon-nucleon interaction. We have studied particularly the influence of hyperons degrees of freedom on the ${}^1{S}_0$ nucleonic pairing gap in neutron star matter. It is found that the appearance of hyperons has little impact on baryonic density range and size for the ${}^1{S}_0$ neutronic pairing gap, the ${}^1{S}_0$ protonic pairing gap also decreases slightly in this region ${\rho }_B=0.0-0.393$ fm${}^{-3}$. However, if baryonic density becomes greater than 0.393 fm${}^{-3}$, the ${}^1{S}_0$ protonic pairing gap obviously increases. In addition, the protonic superfluid range is obviously enlarged due to the presence of hyperons. In our results, the hyperons change the ${}^1{S}_0$ protonic pairing gap which must change the cooling properties of neutron stars.

arXiv comment8 pages, 4 figures

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Cited by in corpus (1)

• Probing into the Possible Range of the U Bosonic Coupling Constants in Neutron Stars Containing Hyperons