Center-of-Mass Problem in Truncated Configuration Interaction and Coupled-Cluster Calculations
| Title | Center-of-Mass Problem in Truncated Configuration Interaction and Coupled-Cluster Calculations |
| Publication Type | Journal Article |
| Year of Publication | 2009 |
| Authors | ,, Gour, JR, Piecuch, P |
| Journal | Physical Letters B |
| Volume | 679 |
| Issue | 4 |
| Pagination | 334-339 |
| Date Published | 08/2009 |
| 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. |