1999/07/19 by Armen Sedrakian, Umberto Lombardo, U. Lombardo · 4 citations
Earth and Planetary Sciences · Physics and Astronomy · #Cold Atom Physics and Bose-Einstein Condensates #High-pressure geophysics and materials #Quantum, superfluid, helium dynamics #astro-ph #nucl-th
paper · pdf · doi:10.1103/physrevlett.84.602
published as Phys.Rev.Lett.84:602-605,2000 · 7 pages, including 3 figures, uses revtex
arxiv created 1999/07/19 · openalex publication_date 2000/01/24 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We study the neutron-proton pairing in nuclear matter as a function of isospin asymmetry at finite temperatures and the empirical 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) = (rho(n)-rho(p))/rho approximately 0.11.