Superfluid Gap in Neutron Matter from a Microscopic Effective Interaction

Year: 2017

Authors: Benhar O., De Rosi G.

Autors Affiliation: Univ Roma La Sapienza, Ist Nazl Fis Nucl, Rome, Italy; Univ Roma La Sapienza, Dipartimento Fis, Rome, Italy;‎ Univ Trento, INO CNR BEC Ctr, Trento, Italy; Univ Trento, Dipartimento Fis, Trento, Italy

Abstract: Correlated basis function (CBF) perturbation theory and the formalism of cluster expansions have been recently employed to obtain an effective interaction from a nuclear Hamiltonian strongly constrained by phenomenology. We report the results of a study of the superfluid gap in pure neutron matter, associated with the formation of Cooper pairs in the channel. The calculations have been carried out using an improved version of the CBF effective interaction, in which three-nucleon forces are taken into account using a microscopic model. Our results show that a non-vanishing superfluid gap develops at densities in the range 2 x 10(-4) less than or similar to rho/rho(0) less than or similar to 0.1, where rho(0) = 2.8 x 10(14) g cm(-3) is the equilibrium density of isospin-symmetric nuclear matter, corresponding mainly to the neutron-star inner crust.


Volume: 189 (5-6)      Pages from: 250  to: 261

KeyWords: Neutron stars; Superfluidity; Nuclear matter; Correlated basis functions; Cluster expansions
DOI: 10.1007/s10909-017-1823-x

Citations: 8
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