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利用最新的格点核子-核子势研究了核物质中的相对论效应。通过此格点核子-核子势场,首先我们构建一个包括π介子,σ介子以及ω介子的单玻色子交换势。势场中的介子-核子耦合常数以及截断动量通过拟合格点核力得到的核子-核子散射相移确定。随后采用非常成功的第一性原理多体计算方法 Brueckner-Hartree-Fock模型,计算了核物质的基本性质。发现对称核物质的状态方程以及饱和性质在非相对论框架和相对论框架中有很明显的区别。在格点核力中,该相对论效应对核物质的结合能提供吸引的贡献。这与采用传统的核力计算得到的结果是相反的。
The relativistic effect in nuclear matter has been studied by using the latest lattice point nuclear-nuclear potential. Through this lattice nucleus-nucleon potential field, first we construct a single boson exchange potential including pion, σ meson, and ω meson. The meson-nucleon coupling constant and the truncation momentum in the potential field are determined by the phase-shift of the nucleon-nucleon scattering obtained by fitting the lattice nucleus forces. Subsequently, the Brueckner-Hartree-Fock model, which is a very successful first-principles multi-body calculation method, was used to calculate the basic properties of nuclear materials. It is found that the equation of state and the property of saturation of symmetric nuclear matter are obviously different between the non-relativistic framework and the relativistic framework. In lattice nuclear power, the relativistic effect can provide attractive contribution to the binding of nuclear matter. This is the opposite of the result calculated using traditional nuclear forces.