期刊
PHYSICS LETTERS B
卷 786, 期 -, 页码 195-200出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physletb.2018.09.044
关键词
Perturbation theory; Many-body theory; Ab initio; Open-shell nuclei
资金
- National Science Foundation [PHY-1614130]
- Deutsche Forschungsgemeinschaft [SFB 1245]
- BMBF [05P15RDFN1]
- Helmholtz International Center for FAIR
- GENCI-TGCC [2018-057392]
- Espace de Structure et de reactions Nucleaires Theorique (ESNT) at CEA
A Rayleigh-Schrodinger many-body perturbation theory (MBPT) approach is introduced by making use of a particle-number-breaking Bogoliubov reference state to tackle (near-)degenerate open-shell fermionic systems. By choosing a reference state that solves the Hartree-Fock-Bogoliubov variational problem, the approach reduces to the well-tested Moller-Plesset, i.e., Hartree-Fock based, MBPT when applied to closed-shell systems. Due to its algorithmic simplicity, the newly developed framework provides a computationally simple yet accurate alternative to state-of-the-art non-perturbative many-body approaches. At the price of working in the quasi-particle basis associated with a single-particle basis of sufficient size, the computational scaling of the method is independent of the particle number. This paper presents the first realistic applications of the method ranging from the oxygen to the nickel isotopic chains on the basis of a modern nuclear Hamiltonian derived from chiral effective field theory. (C) 2018 The Authors. Published by Elsevier B.V.
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