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arXiv 0907.5350nucl-thnucl-ex
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同位旋非对称核物质的等压不可压缩性

Isobaric incompressibility of the isospin asymmetric nuclear matter

D. N. Basu, P. Roy Chowdhury, C. Samanta

摘要:

利用密度相关的M3 Y相互作用系统地研究了非对称核物质饱和性质,特别是饱和密度下不可压缩性$K_\infty (X) = K_\infty + K_τX^2 + O(X^4)$的同位旋依赖性. $K_τ$表征了饱和密度$ρ_0$下不可压缩性的同位旋依赖性。近似表达式$K_{asy} \approx K_{sym}-6L$通常用于$K_τ$,其中$L$和$K_{sym}$分别表示$ρ_0$处对称能的斜率和曲率参数。它可以精确地表示为$K_τ=K_{sym}-6L-\frac{Q_0}{K_\infty}L$,其中$Q_0$是对称核物质在$ρ_0$的三阶导数参数。Phys. Rev. C 80,011305(R)(2009)附录的结果表明,$Q_0$对$K_τ$的贡献并非微不足道。

英文摘要:

The isospin dependence of the saturation properties of asymmetric nuclear matter, particularly the incompressibility $K_\infty (X) = K_\infty + K_τX^2 + O(X^4)$ at saturation density is systematically studied using density dependent M3Y interaction. The $K_τ$ characterizes the isospin dependence of the incompressibility at saturation density $ρ_0$. The approximate expression $K_{asy} \approx K_{sym}-6L$ is often used for $K_τ$ where $L$ and $K_{sym}$ represent, respectively, the slope and curvature parameters of the symmetry energy at $ρ_0$. It can be expressed accurately as $K_τ=K_{sym}-6L-\frac{Q_0}{K_\infty}L$ where $Q_0$ is the third-order derivative parameter of symmetric nuclear matter at $ρ_0$. The results of this addendum to Phys. Rev. C 80, 011305(R) (2009) indicate that the $Q_0$ contribution to $K_τ$ is not insignificant.

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