Thermodynamics of $n$-$p$ condensate in asymmetric nuclear matter

Details Thermodynamics of $n$-$p$ condensate in asymmetric nuclear matter Thermodynamics of $n$-$p$ condensate in asymmetric nuclear matter

1999-07-19

arxiv.org/abs/nucl-th/9907076v1

Phys.Rev.Lett.84:602-605,2000

Physics

Nuclear Physics

Nuclear Theory

7 pages, including 3 figures, uses revtex

Scientific paper

10.1103/PhysRevLett.84.602

We study the neutron-proton pairing in nuclear matter as a function of isospin asymmetry at finite temperatures and the saturation density using realistic nuclear forces and Brueckner-renormalized single particle spectra. Our computation of the thermodynamic quantities shows that while the difference of the entropies of the superconducting and normal phases anomalously changes its sign as a function of temperature for arbitrary asymmetry, the grand canonical potential does not; the superconducting state is found to be stable in the whole temperature-asymmetry plane. The pairing gap completely disappears for density-asymmetries exceeding $\alpha_c= (n_n-n_p)/n \simeq 0.11$.

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