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arXiv 1310.1192nucl-th
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非对称核物质的EOS在不同自旋-同位旋通道中的分解

Decomposition of EOS of Asymmetric Nuclear Matter into Different Spin-isospin Channels

Wei Zuo, Shan-Gui Zhou, Jun-Qing Li, En-Guang Zhao, Werner Scheid

摘要:

在Brueckner-Hartree-Fock方法的框架下,我们研究了非对称核物质的状态方程及其在不同自旋-同位旋$ST$通道中的同位旋依赖性.结果表明,在同位旋单重态T=0通道中,每个核子的势能主要取决于张量SD耦合通道的贡献。在高密度下,TBF对同位旋三重态T=1通道贡献的影响远大于对T=0通道贡献的影响。在正常核物质密度附近或以下的低密度下,同位旋依赖性主要来自于同位旋单重态SD通道,而同位旋三重态T=1分量几乎与同位旋不对称性无关。随着密度的增加,T=1沟道贡献变得对同位旋不对称性敏感,并且在足够高的密度下,其同位旋依赖性甚至可能变得比T=0贡献更显著。这些结果可为改进核介质中核子-核子有效相互作用以及在微观多体理论基础上构造新的核子-核子有效相互作用泛函提供一些微观约束.

英文摘要:

We investigate the equation of state of asymmetric nuclear matter and its isospin dependence in various spin-isospin $ST$ channels within the framework of the Brueckner-Hartree-Fock approach extended to include a microscopic three-body force (TBF). It is shown that the potential energy per nucleon in the isospin-singlet T=0 channel is mainly determined by the contribution from the tensor SD coupled channel. At high densities, the TBF effect on the isospin-triplet T=1 channel contribution turns out to be much larger than that on the T=0 channel contribution. At low densities around and below the normal nuclear matter density, the isospin dependence is found to come essentially from the isospin-singlet SD channel and the isospin-triplet T=1 component is almost independent of isospin-asymmetry. As the density increases, the T=1 channel contribution becomes sensitive to the isospin-asymmetry and at high enough densities its isospin-dependence may even become more pronounced than that of the T=0 contribution. The present results may provide some microscopic constraints for improving effective nucleon-nucleon interactions in nuclear medium and for constructing new functionals of effective nucleon-nucleon interaction based on microscopic many-body theories.

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