Phys. Rev. Lett. 98, 112501 (2007) [4 pages]Coupled-Cluster and Configuration-Interaction Calculations for Heavy NucleiReceived 4 December 2006; published 13 March 2007 We compare coupled-cluster (CC) and configuration-interaction (CI) results for 56Ni 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 f7/2 orbit and the f5/2, p3/2, p1/2 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. © 2007 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.98.112501
DOI:
10.1103/PhysRevLett.98.112501
PACS:
21.60.Cs, 21.60.Gx, 27.40.+z, 31.15.Dv
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