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arXiv 1507.05064nucl-th
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ETF近似下的解析质量公式和核表面性质

Analytical mass formula and nuclear surface properties in the ETF approximation

F. Aymard, F. Gulminelli, J. Margueron

摘要:

在Skyrme泛函的扩展托马斯费米近似(ETF)的框架下,解决了确定核表面和表面对称能的问题。我们提出了一个分析模型的密度分布与变分确定的扩散参数。对于对称核的情况下,所得到的ETF功能可以被精确地集成,导致一个解析公式表示的表面能的能量泛函的耦合的函数。强调了非局部项的重要性,它不能简单地从泛函的局部部分推导出来。在非对称核的情况下,我们提出了扩散度和表面能的近似表达式。这些量与能量泛函的参数解析相关。特别地,可以明确地量化不同状态方程参数的影响。不同的能量分量(本地/非本地,isoscillation/isovector,表面/曲率和高阶)的详细分析也进行。我们的分析解决方案的ETF积分改善了以前的模型,并导致精度优于200千电子伏每核子在确定的核结合能滴线核。

英文摘要:

The problem of the determination of the nuclear surface and surface symmetry energy is addressed in the framework of the Extended Thomas Fermi (ETF) approximation using Skyrme functionals. We propose an analytical model for the density profiles with variationally determined diffuseness parameters. For the case of symmetric nuclei, the resulting ETF functional can be exactly integrated, leading to an analytical formula expressing the surface energy as a function of the couplings of the energy functional. The importance of non-local terms is stressed, which cannot be simply deduced from the local part of the functional. In the case of asymmetric nuclei, we propose an approximate expression for the diffuseness and the surface energy. These quantities are analytically related to the parameters of the energy functional. In particular, the influence of the different equation of state parameters can be explicitly quantified. Detailed analyses of the different energy components (local/non-local, isoscalar/isovector, surface/curvature and higher order) are also performed. Our analytical solution of the ETF integral improves over previous models and leads to a precision better than 200 keV per nucleon in the determination of the nuclear binding energy for dripline nuclei.

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