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arXiv 1407.2643nucl-th
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非对称核物质的热性质

Thermal Properties of Asymmetric Nuclear Matter

Andreas Fedoseew, Horst Lenske

摘要:

用相对论平均场方法研究了非对称核物质的热性质.我们从自由空间NN相互作用出发,利用Dirac-Brueckner理论导出介质内自能。利用DDRH方法,我们用自洽的方法导出了密度相关的介子-重子顶点。在平均场水平,我们包括isoscillation和isovector标量和矢量相互作用。本文研究了重子总密度到中子星范围、从对称核物质到纯中子物质的不对称性和温度到T~100 MeV的核状态方程。发现等矢标自能对非对称核物质的热性质有很强的修正作用。一个引人注目的结果是当包含等矢量-标量自能时相变的变化。

英文摘要:

The thermal properties of asymmetric nuclear matter are investigated in a relativistic mean- field approach. We start from free space NN-interactions and derive in-medium self-energies by Dirac-Brueckner theory. By the DDRH procedure we derive in a self-consistent approach density- dependent meson-baryon vertices. At the mean-field level, we include isoscalar and isovector scalar and vector interactions. The nuclear equation of state is investigated for a large range of total baryon densities up to the neutron star regime, the full range of asymmetries from symmetric nuclear matter to pure neutron matter, and temperatures up to T~100 MeV. The isovector-scalar self-energies are found to modify strongly the thermal properties of asymmetric nuclear matter. A striking result is the change of phase transitions when isovector-scalar self-energies are included.

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