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arXiv 2602.22669nucl-th
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核能级统计中的对称性约束相关性:自旋分布

Symmetry-imposed correlation in nuclear level statistics: The spin distribution

School of Physics and Astronomy, Shanghai Jiao Tong University(上海交通大学物理与天文学院)

Junchao Guo, Yang Sun

AI总结:

该研究通过构建强制旋转不变性的统计集合,揭示了核能级统计中自旋截止的起源,发现其源于费米反symmetry和角动量耦合的关联性。

摘要:

尽管长期研究,核能级密度中自旋截止的起源仍然未能完全阐明。我们证明这个问题可以追溯到Bethe假设,即有限费米系统中的核子是独立随机变量。通过构建一个通过角动量耦合强制旋转不变性的统计集合,我们得到了自旋截止参数的解析表达式,其中包含了一个此前未被识别的有限群体修正。我们的结果表明,在没有相互作用的情况下,核多体态也表现出非可忽略的相关性,这种相关性源于费米反symmetry和角动量耦合。从这个角度来看,自旋截止可以被解释为对核能级统计中对称性施加的相关性量度。

英文摘要:

Despite long-term research, the origin of spin cutoff in the angular-momentum (spin) distribution of nuclear level densities remains incompletely elucidated. We demonstrate that this problem can be traced back to Bethe's assumption that nucleons in finite Fermi systems are independent random variables. By constructing a statistical ensemble that enforces rotational invariance through angular-momentum coupling, we obtain an analytical expression for the spin cutoff parameter, which includes a previously unidentified finite-population correction. Our results show that, even in the absence of interactions, nuclear many-body states exhibit non-negligible correlations arising from fermionic antisymmetry and angular-momentum coupling. From this perspective, spin cutoff may be interpreted as a quantitative measure of correlation imposed by symmetry in nuclear level statistics.

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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