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首页> 外文期刊>Physical review, C >Trajectory in 2D plot of isoscalar and isovector densities of Ca-48 and Pb-208, and symmetry energy
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Trajectory in 2D plot of isoscalar and isovector densities of Ca-48 and Pb-208, and symmetry energy

机译：CA-48和PB-208的ISOSCALAR和Isovector密度的2D图中的轨迹，以及对称能量

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摘要

We propose a new two-dimensional (2D) plotting method of isoscalar-isovector (IS-IV) densities of Ca-48 and Pb-208 to extract not only empirical symmetry energy coefficients J, L, and K-sym but also the asymmetric isospin term K-tau in the nuclear incompressibility. We adopted several modern relativistic and nonrelativistic energy density functional (EDF) for the theoretical calculations of IS and IV densities to compare with experimental neutron and proton density distributions determined by recent proton elastic scatterings. We found very strong correlations between the trajectory of the 2D density at the density rho = 0.1 fm(-3) and the symmetry energy coefficients J, L, and also K-tau. For K-sym, the Skyrme EDF SAMi-J family shows a strong correlation in the trajectory of 2D density, while the RMF Lagrangian DDME-J family shows a peculiar quadratic curve and does not provide the experimental value. The symmetry energy term K-tau of nuclear incompressibility is also discussed in term of the slope of 2D trajectory.
机译：我们提出了一种新的Ca-48和Pb-208等标量等矢量（IS-IV）密度二维作图方法，不仅可以提取经验对称能量系数J、L和K-sym，还可以提取核不可压缩性中的非对称同位旋项K-tau。我们采用了几种现代相对论和非相对论能量密度泛函（EDF）对IS和IV密度进行了理论计算，并与最近质子弹性散射确定的实验中子和质子密度分布进行了比较。我们发现，在密度rho=0.1 fm（-3）时，2D密度的轨迹与对称能量系数J、L以及K-tau之间存在非常强的相关性。对于K-sym，Skyrme-EDF-SAMi-J族在二维密度的轨迹上显示出强相关性，而RMF-Lagrangian-DDME-J族显示出一条特殊的二次曲线，并且没有提供实验值。根据二维轨道的斜率讨论了核不可压缩性的对称能量项K-tau。

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