Toward open-shell nuclei with coupled-cluster theory
Toward open-shell nuclei with coupled-cluster theory
复制标题
用耦合团簇理论研究开壳层核
DOI：
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
T. Papenbrock
中科院分区：
文献类型：
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作者：
G. Jansen;M. Hjorth;G. Hagen;T. Papenbrock
我们开发了一种基于运动方程耦合团簇理论的方法来描述闭壳外有 A{+-}2 核子的开壳核的性质。我们对氦同位素 {sup 3-6}He 的基态和 {sup 6}He 中的第一激发 2{sup +} 态进行原理验证计算。与小模型空间中矩阵对角化的精确结果的比较证明了耦合聚类方法的准确性。 {sup 4}He的三粒子一空穴激发对于{sup 6}He的准确描述具有重要作用。对于开壳核{sup 6}He，该方法的计算成本与耦合团簇单双近似近似相当，而其精度与单、双、三重激发的耦合团簇相似。
We develop a method based on equation-of-motion coupled-cluster theory to describe properties of open-shell nuclei with A{+-}2 nucleons outside a closed shell. We perform proof-of-principle calculations for the ground states of the helium isotopes {sup 3-6}He and the first excited 2{sup +} state in {sup 6}He. The comparison with exact results from matrix diagonalization in small model spaces demonstrates the accuracy of the coupled-cluster methods. Three-particle-one-hole excitations of {sup 4}He play an important role for the accurate description of {sup 6}He. For the open-shell nucleus {sup 6}He, the computational cost of the method is comparable with the coupled-cluster singles-and-doubles approximation while its accuracy is similar to the coupled-cluster with singles, doubles, and triples excitations.