Thermodynamics of a n-p condensate in asymmetric nuclear matter
Thermodynamics of a n-p condensate in asymmetric nuclear matter
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DOI：
10.1103/physrevlett.84.602
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发表时间：
1999-07
影响因子：
8.6
通讯作者：
A. Sedrakian;Umberto Lombardo
中科院分区：
文献类型：
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作者：
A. Sedrakian;Umberto Lombardo
我们使用现实核力和布鲁克纳重整化单粒子光谱研究核物质中的中子-质子配对作为有限温度下同位旋不对称性的函数以及经验饱和密度。我们对热力学量的计算表明，虽然超导相和正相的熵差随着任意不对称性的温度函数而异常改变其符号，但大正则势却没有；发现超导态在整个温度不对称平面内是稳定的。当密度不对称性超过 alpha(c) = (rho(n)-rho(p))/rho 约 0.11 时，配对间隙完全消失。
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.