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THE PROPERTIES OF NUCLEAR MATTER

机译：核物质的性质

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摘要

The properties of nuclear matter at zero and finite temperatures in the frame of the Brueckner theory realistic nucleon-nucleon potentials are studied. Comparison with other calculations is made. In addition we present results for the symmetry energy obtained with different potentials, which is of great importance in astrophysical calculation. Properties of asymmetric nuclear matter are derived from various many-body approaches. This includes phenomenological ones like the Skyrme Hartree-Fock and relativistic mean field approaches, which are adjusted to fit properties of nuclei, as well as more microscopic attempts like the BHF approximation, a Self-Consistent Greens Function (SCGF) method and the so-called V_(lowk) approach, which are based on realistic nucleon-nucleon interactions which reproduce the nucleon-nucleon phase shifts. These microscopic approaches are supplemented by a density-dependent contact interaction to achieve the empirical saturation property of symmetric nuclear matter. Special attention is paid to behavior of the isovector and the isoscalar component of the effective mass in neutron-rich matter. The nuclear symmetry potential at fixed nuclear density is also calculated and its value decreases with increasing the nucleon energy. In particular, the nuclear symmetry potential at saturation density changes from positive to negative values at nucleon kinetic energy of about 200 MeV. The hot properties of nuclear matter are also calculated using T~2-approximation method at low temperatures. Good agreement is obtained in comparison with previous theoretical estimates and experimental data especially at low densities.
机译：在Brueckner理论的框架内，研究了在零温度和有限温度下核物质的性质，研究了现实的核子-核子电势。与其他计算进行比较。另外，我们给出了在不同电位下获得的对称能量的结果，这在天体物理计算中具有重要意义。不对称核物质的特性源自各种多体方法。这包括象Skyrme Hartree-Fock这样的现象学方法和相对论平均场方法，这些方法已经过调整以适合原子核的性质，以及更多的微观尝试，例如BHF近似，自洽格林函数（SCGF）方法等等。称为V_（lowk）方法，该方法基于再现核子-核子相移的实际核子-核子相互作用。这些微观方法通过依赖于密度的接触相互作用得到补充，以实现对称核物质的经验饱和特性。要特别注意富中子物质中等矢量和有效质量的等量成分的行为。还计算了固定核密度下的核对称势，其值随着核子能量的增加而减小。特别地，在大约200 MeV的核子动能下，饱和密度下的核对称势从正值变为负值。核物质的热性质也可以在低温下使用T〜2近似法进行计算。与以前的理论估计值和实验数据相比，可以获得很好的一致性，尤其是在低密度下。

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