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arXiv 1606.01410nucl-th
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有效Skyrme相互作用的表面性质的约束

Constraining the surface properties of effective Skyrme interactions

R. Jodon, M. Bender, K. Bennaceur, J. Meyer

摘要:

本研究的目的有三个:首先,确定一个确定表面能系数a_surf的方案,该方案在鲁棒性、精度和数值效率之间提供最佳折衷;第三,给出了在参数拟合过程中如何约束Skyrme能量密度泛函(EDF)的变形性质的过程。有几种常用的可能性来定义和计算有效相互作用的表面能系数a_surf。半无限核物质模型系统提供了最直接的途径,但也可以从有限核结合能系统学中提取a_surf。计算可以进行自洽(HF),其中包括量子壳效应,或在一个半经典的扩展的费米子-费米(ETF)或修改的费米子-费米(MTF)近似。计算了76个参数化的Skyrme EDF的表面能系数。用HF、ETF和MTF方法获得的值并不相同,而是相差相当恒定的系统偏移。尽管与本文研究的其他方法相比存在一些缺点,但MTF方法为a_surf提供了足够精确的值,使得它可以在参数拟合期间以可忽略的额外成本用作对表面特性的非常鲁棒的约束。通过构建一系列的8个参数化SLy 5s 1-SLy 5s 8的标准Skyrme EDF与系统变化的a_surf值,它示出了如何达到与现实的变形性能的配合。[Note:由于arXiv的长度限制,摘要已被缩写。见论文全文摘要]。

英文摘要:

The purpose of this study is threefold: first, to identify a scheme for the determination of the surface energy coefficient a_surf that offers the best compromise between robustness, precision, and numerical efficiency; second, to analyze the correlation between values for a_surf and the characteristic energies of the fission barrier of Pu240; and third, to lay out a procedure how the deformation properties of the Skyrme energy density functional (EDF) can be constrained during the parameter fit. There are several frequently used possibilities to define and calculate the surface energy coefficient a_surf of effective interactions. The most direct access is provided by the model system of semi-infinite nuclear matter, but a_surf can also be extracted from the systematics of binding energies of finite nuclei. Calculations can be carried out either self-consistently (HF), which incorporates quantal shell effects, or in one of the semi-classical Extended Thomas-Fermi (ETF) or Modified Thomas-Fermi (MTF) approximations. The surface energy coefficient of 76 parameterizations of the Skyrme EDF have been calculated. Values obtained with the HF, ETF and MTF methods are not identical, but differ by fairly constant systematic offsets. Despite having some drawbacks compared to the other methods studied here, the MTF approach provides sufficiently precise values for a_surf such that it can be used as a very robust constraint on surface properties during a parameter fit at negligible additional cost. Through the construction of a series of eight parameterizations SLy5s1-SLy5s8 of the standard Skyrme EDF with systematically varied a_surf value it is shown how to arrive at a fit with realistic deformation properties. [Note: The abstract has been abbreviated because of length restrictions imposed by the arXiv. See the paper for the full abstract.]

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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