截断组态相互作用和耦合团簇计算中的质心问题
Center-of-mass problem in truncated configuration interaction and coupled-cluster calculations
摘要：
分析了用组态相互作用（CI）和耦合团簇（CC）方法进行原子核结构从头计算时的质心污染问题。本文提出了一个严格的定量诊断本征观测量CM污染的方案，并应用于He-4和O-16的基态计算。O-16的CI和CC计算的基础上定义的模型空间通过截断的单粒子基础导致相当大的CM污染，而重要性截断的无核壳模型的基础上的$N_{\max}\hbarΩ$空间几乎是免费的CM污染。
英文摘要：
The problem of center-of-mass (CM) contaminations in ab initio nuclear structure calculations using configuration interaction (CI) and coupled-cluster (CC) approaches is analyzed. A rigorous and quantitative scheme for diagnosing the CM contamination of intrinsic observables is proposed and applied to ground-state calculations for He-4 and O-16. The CI and CC calculations for O-16 based on model spaces defined via a truncation of the single-particle basis lead to sizable CM contaminations, while the importance-truncated no-core shell model based on the $N_{\max}\hbarΩ$ space is virtually free of CM contaminations.
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