The virial equation of state of low-density neutron matter

被引：88

作者：

Horowitz, C. J.

Schwenk, A. ^{[1
]}

机构：

[1] Indiana Univ, Ctr Nucl Theory, Bloomington, IN 47408 USA

[2] Indiana Univ, Dept Phys, Bloomington, IN 47408 USA

来源：

PHYSICS LETTERS B | 2006年 / 638卷 / 2-3期

基金：

美国国家科学基金会;

关键词：

low-density neutron matter; equation of state; virial expansion;

D O I：

10.1016/j.physletb.2006.05.055

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present a model-independent description of low-density neutron matter based on the virial expansion. The virial equation of state provides a benchmark for all nuclear equations of state at densities and temperatures where the interparticle separation is large compared to the thermal wavelength. We calculate the second virial coefficient directly from the nucleon-nucleon scattering phase shifts. Our results for the pressure, energy, entropy and the free energy correctly include the physics of the large neutron-neutron scattering length. We find that, as in the universal regime. thermodynamic properties of neutron matter scale over a wide range of temperatures, but with a significantly reduced interaction coefficient compared to the unitary limit. (c) 2006 Elsevier B.V. All rights reserved.

引用

页码：153 / 159

页数：7

共 39 条

[1] Equation of state of nucleon matter and neutron star structure [J].