期刊
PHYSICS LETTERS B
卷 786, 期 -, 页码 448-452出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physletb.2018.10.029
关键词
Perturbation theory; Ab initio; Many-body theory
资金
- DFG [SFB 1245]
- Helmholtz International Center for FAIR
- BMBF [05P18RDFN1]
We introduce a hybrid many-body approach that combines the flexibility of the No-Core Shell Model (NCSM) with the efficiency of Multi-Configurational Perturbation Theory (MCPT) to compute ground-and excited-state energies in arbitrary open-shell nuclei in large model spaces. The NCSM in small model spaces is used to define a multi-determinantal reference state that contains the most important multi-particle multi-hole correlations and a subsequent second-order MCPT correction is used to capture additional correlation effects from a large model space. We apply this new ab initio approach for the calculation of ground-state and excitation energies of even and odd-mass carbon, oxygen, and fluorine isotopes and compare to large-scale NCSM calculations that are computationally much more expensive. (C) 2018 The Authors. Published by Elsevier B.V.
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