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arXiv 0811.2729nucl-thastro-phnucl-ex
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相对论平均场论中的呼吸模巨共振和表面压缩性

The breathing-mode giant monopole resonance and the surface compressibility in the relativistic mean-field theory

M. M. Sharma

摘要:

利用相对论平均场理论中的生成坐标方法,研究了呼吸模式等谐巨磁共振(GMR)。采用拉格朗日模型的非线性$σ$模型(NL $σ$),标量-矢量相互作用模型(SVI)和$σ$ - $ω$耦合模型(SIGO),我们表明,每个拉格朗日模型表现出明显不同的GMR响应。因此,对于给定的核物质不可压缩性$K_\infty$值,拉格朗日模型产生不同的GMR能量值。它示出,这种效果主要是从一个不同的值的表面不可压缩性$K_{surf}$固有的每个拉格朗日模型,从而引起的比率$K_{surf}/K_\infty$,这取决于所使用的拉格朗日模型。这是由于介子质量的密度依赖性的差异,因此不同的拉格朗日模型之间的核相互作用的密度依赖性。GMR能量对所使用的拉格朗日模型的敏感性以及因此对于给定的$K_\infty$值出现的大量GMR能量使得基于力之间的插值来提取$K_\infty$的方法是不合适的。作为补救措施,需要“校准”的RMF理论中的核相互作用的密度依赖性。

英文摘要:

The breathing-mode isoscalar giant monopole resonance (GMR) is investigated using the generator coordinate method within the relativistic mean-field (RMF) theory. Employing the Lagrangian models of the nonlinear-$σ$ model (NL$σ$), the scalar-vector interaction model (SVI) and the $σ$-$ω$ coupling model (SIGO), we show that each Lagrangian model exhibits a distinctly different GMR response. Consequently, Lagrangian models yield a different value of the GMR energy for a given value of the nuclear matter incompressibility $K_\infty$. It is shown that this effect arises largely from a different value of the surface incompressibility $K_{surf}$ inherent to each Lagrangian model, thus giving rise to the ratio $K_{surf}/K_\infty$ which depends upon the Lagrangian model used. This is attributed to a difference in the density dependence of the meson masses and hence to the density dependence of the nuclear interaction amongst various Lagrangian models. The sensitivity of the GMR energy to the Lagrangian model used and thus emergence of a multitude of GMR energies for a given value of $K_\infty$ renders the method of extracting $K_\infty$ on the basis of interpolation amongst forces as inappropriate. As a remedy, the need to 'calibrate' the density dependence of the nuclear interaction in the RMF theory is proposed.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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