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arXiv 1209.0212nucl-thhep-ph
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准粒子统计方法下核物质的团簇维里展开

Cluster virial expansion for nuclear matter within a quasiparticle statistical approach

G. Ropke, N. -U. Bastian, D. Blaschke, T. Klahn, S. Typel, H. H. Wolter

摘要:

相互作用的多粒子系统中的关联可以导致团簇的形成,特别是束缚态和共振。系统的量子统计方法允许将核统计平衡描述(质量作用定律)与平均场概念相结合。一个化学图像,它把集群作为不同的实体,作为一个直观的概念来处理低密度极限。在一个广义的Beth-Uhlenbeck方法,准粒子维里扩展到包括任意的集群,其中必须特别注意,以避免不一致,如重复计算。由于泡利阻塞,相关性随着密度的增加而被抑制。通过明确考虑团簇和引入准粒子能量,可以减少连续介质对维里系数的贡献。核物质的团簇维里展开将低密度的已知基准与接近饱和密度的基准结合起来。

英文摘要:

Correlations in interacting many-particle systems can lead to the formation of clusters, in particular bound states and resonances. Systematic quantum statistical approaches allow to combine the nuclear statistical equilibrium description (law of mass action) with mean-field concepts. A chemical picture, which treats the clusters as distinct entities, serves as an intuitive concept to treat the low-density limit. Within a generalized Beth-Uhlenbeck approach, the quasiparticle virial expansion is extended to include arbitrary clusters, where special attention must be paid to avoid inconsistencies such as double counting. Correlations are suppressed with increasing density due to Pauli blocking. The contribution of the continuum to the virial coefficients can be reduced by considering clusters explicitly and introducing quasiparticle energies. The cluster-virial expansion for nuclear matter joins known benchmarks at low densities with those near saturation density.

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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