Coupled-cluster and configuration-interaction calculations for heavy nuclei

被引：33
|
作者：
Horoi, M. [1 ]
Gour, J. R.
Wloch, M.
Lodriguito, M. D.
Brown, B. A.
Piecuch, P.
机构：
[1] Cent Michigan Univ, Dept Phys, Mt Pleasant, MI 48859 USA
[2] Michigan State Univ, Dept Chem, E Lansing, MI 48824 USA
[3] Michigan State Univ, Dept Phys & Astron, E Lansing, MI 48824 USA
[4] Michigan State Univ, Natl Superconducting Cyclotron Lab, E Lansing, MI 48824 USA
来源：
PHYSICAL REVIEW LETTERS | 2007年 / 98卷 / 11期
关键词：
D O I：
10.1103/PhysRevLett.98.112501
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We compare coupled-cluster (CC) and configuration-interaction (CI) results for Ni-56 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(7/2) orbit and the f(5/2), p(3/2), p(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.
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页数：4
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