Coupled-Cluster and Configuration-Interaction Calculations for Heavy Nuclei
Journal Article
·
· Physical Review Letters
- Department of Physics, Central Michigan University, Mount Pleasant, Michigan 48859 (United States)
- Department of Chemistry, Michigan State University, East Lansing, Michigan 48824 (United States)
- Department of Physics and Astronomy and National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824 (United States)
We compare coupled-cluster (CC) and configuration-interaction (CI) results for {sup 56}Ni obtained in the pf-shell basis, focusing on practical CC approximations that can be applied to systems with dozens or hundreds of correlated fermions. The weight of the reference state and the strength of correlation effects are controlled by the gap between the f{sub 7/2} orbit and the f{sub 5/2}, p{sub 3/2}, p{sub 1/2} orbits. Independent of the gap, the CC method with 1p-1h and 2p-2h clusters and a noniterative treatment of 3p-3h clusters is as accurate as the more demanding CI approach truncated at the 4p-4h level.
- OSTI ID:
- 20957748
- Journal Information:
- Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 11 Vol. 98; ISSN 0031-9007; ISSN PRLTAO
- Country of Publication:
- United States
- Language:
- English
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