Center-of-Mass Problem in Truncated Configuration Interaction and Coupled-Cluster Calculations

TitleCenter-of-Mass Problem in Truncated Configuration Interaction and Coupled-Cluster Calculations
Publication TypeJournal Article
Year of Publication2009
Authors,, Gour, JR, Piecuch, P
JournalPhysical Letters B
Volume679
Issue4
Pagination334-339
Date Published08/2009
Abstract

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.