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arXiv 2201.07298nucl-th
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耦合团簇理论中的Angular-momentum投影:$^{34}$ Mg的结构

Angular-momentum projection in coupled-cluster theory: structure of $^{34}$Mg

G. Hagen, S. J. Novario, Z. H. Sun, T. Papenbrock, G. R. Jansen, J. G. Lietz, T. Duguet, A. Tichai

摘要:

单参考耦合团簇理论是一种计算核多体问题的精确而经济的计算方法。对于开壳层核,参考态通常会破坏转动不变性,角动量必须恢复为一个好的量子数。我们进行角动量投影后的变化,并采用解纠缠耦合集群形式主义和厄米特的方法。我们比较我们的结果与基准$^8$ Be和$^{20}$ Ne使用两个核子相互作用的手征有效场论和$pf$壳核内的传统壳模型。我们计算了奇异核$^{34}$ Mg的转动带,并与实验数据相吻合。

英文摘要:

Single-reference coupled-cluster theory is an accurate and affordable computational method for the nuclear many-body problem. For open-shell nuclei, the reference state typically breaks rotational invariance and angular momentum must be restored as a good quantum number. We perform angular-momentum projection after variation and employ the disentangled coupled-cluster formalism and a Hermitian approach. We compare our results with benchmarks for $^8$Be and $^{20}$Ne using a two-nucleon interaction from chiral effective field theory and for $pf$-shell nuclei within the traditional shell model. We compute the rotational band in the exotic nucleus $^{34}$Mg and find agreement with data.

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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