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arXiv 1607.01372nucl-th
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核密度泛函理论中的成簇和pasta相

Clustering and pasta phases in nuclear density functional theory

Bastian Schuetrumpf, Chunli Zhang, Witold Nazarewicz

摘要:

核密度泛函理论(DFT)是描述复杂原子核性质和体核子物质复杂相态的首选工具。它是一种基于代表核相互作用的能量密度泛函的微观方法。核密度泛函理论的一个吸引人的特点是它既可以应用于有限核,也可以应用于中子星内壳中出现的pasta相。虽然中子星中的原子核团簇可以很容易地通过它们的密度分布来表征,但原子核中核子的聚集程度往往很难评估。为此,我们使用核子定域的概念。我们证明,本地化措施为我们提供了轻,重核,包括裂变系统的集群的指纹。此外,我们调查的棒状面食阶段使用扭曲平均边界条件,使计算在有限体积访问的最先进的DFT求解器。

英文摘要:

Nuclear density functional theory (DFT) is the tool of choice in describing properties of complex nuclei and intricate phases of bulk nucleonic matter. It is a microscopic approach based on an energy density functional representing the nuclear interaction. An attractive feature of nuclear DFT is that it can be applied to both finite nuclei and pasta phases appearing in the inner crust of neutron stars. While nuclear pasta clusters in a neutron star can be easily characterized through their density distributions, the level of clustering of nucleons in a nucleus can often be difficult to assess. To this end, we use the concept of nucleonic localization. We demonstrate that the localization measure provides us with fingerprints of clusters in light and heavy nuclei, including fissioning systems. Furthermore we investigate the rod-like pasta phase using twist-averaged boundary conditions, which enable calculations in finite volumes accessible by state of the art DFT solvers.

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