Center-of-Mass Problem in Truncated Configuration Interaction and Coupled-Cluster Calculations
|Center-of-Mass Problem in Truncated Configuration Interaction and Coupled-Cluster Calculations
|Year of Publication
|,, Gour, JR, Piecuch, P
|Physical Letters B
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 4He and 16O. The CI and CC calculations for 16O 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 NmaxΩ space is virtually free of CM contaminations.