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arXiv 0712.0052nucl-thastro-ph
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超新星核中核“面食”的Phase diagram及其不确定性

Phase diagram of nuclear "pasta" and its uncertainties in supernova cores

Hidetaka Sonoda, Gentaro Watanabe, Katsuhiko Sato, Kenji Yasuoka, Toshikazu Ebisuzaki

摘要:

本文用量子分子动力学(QMD)方法研究了超新星核中非均匀核物质相图的模型依赖性。非均质物质包括具有非球形核的结晶物质--“面食”相--以及分离核物质的液-气相。QMD模型相图之间的主要差异可以用低密度纯中子物质的能量和非对称核物质的饱和密度来解释。我们发现对称能的密度依赖性也有助于理解相图的不确定性。我们指出,对于典型的核模型,在坍缩核的后期阶段,pasta相的质量分数高于10- 20%。

英文摘要:

We examine the model dependence of the phase diagram of inhomogeneous nulcear matter in supernova cores using the quantum molecular dynamics (QMD). Inhomogeneous matter includes crystallized matter with nonspherical nuclei - "pasta" phases - and the liquid-gas phase separating nuclear matter. Major differences between the phase diagrams of the QMD models can be explained by the energy of pure neutron matter at low densities and the saturation density of asymmetric nuclear matter. We show the density dependence of the symmetry energy is also useful to understand uncertainties of the phase diagram. We point out that, for typical nuclear models, the mass fraction of the pasta phases in the later stage of the collapsing cores is higher than 10-20 %.

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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