Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2008-05-26
Physics
Nuclear Physics
Nuclear Theory
10 pages, 9 figures. Version 2: a new figure inserted, some misprints fixed
Scientific paper
The 1S0 pairing gap associated with the inner crust of a neutron star is calculated, taking into account the coexistence of the nuclear lattice with the sea of free neutrons (finite size effects), as well as medium polarization effects associated with the exchange of density and spin fluctuations. Both effects are found to be important and to lead to an overall quenching of the pairing gap. This result, whose quantitative value is dependent on the effective interaction used to generate the single-particle levels, is a consequence of the balance between the attractive (repulsive) induced interaction arising from the exchange of density (spin) modes, balance which in turn is influenced by the presence of the protons and depends on the single-particle structure of the system.
Baroni Sandra
Barranco Francisco
Broglia Ricardo A.
Pastore Annalisa
Raimondi F.
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