期刊
PHYSICS LETTERS B
卷 683, 期 4-5, 页码 272-277出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physletb.2009.12.046
关键词
Ab initio nuclear structure; Many-body perturbation theory; Pade approximants; Configuration interaction
资金
- DFG [SF13 634]
- BMBF [06DA90401]
We apply high-order many-body perturbation theory for the calculation of ground-state energies of closed-shell nuclei using realistic nuclear interactions. Using a simple recursive formulation, we compute the perturbative energy contributions up to 30th order and compare to exact no-core shell model calculations for the same model space and Hamiltonian. Generally, finite partial sums of this perturbation series do not show convergence with increasing order, but tend to diverge exponentially. Nevertheless, through a simple resummation via Pade approximants it is possible to extract rapidly converging and highly accurate results for the ground-state energy once perturbative contributions beyond 5th order are included. (C) 2009 Elsevier B.V. All rights reserved.
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