Open-shell nuclei from No-Core Shell Model with perturbative improvement
| Autor: | Klaus Vobig, Eskendr Gebrerufael, Robert Roth, Alexander Tichai |
|---|---|
| Přispěvatelé: | Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay |
| Rok vydání: | 2018 |
| Předmět: |
Nuclear and High Energy Physics
Nuclear Theory [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th] Many-body theory Ab initio FOS: Physical sciences Perturbation theory Space (mathematics) 01 natural sciences 7. Clean energy Nuclear Theory (nucl-th) Core shell 05.10.Cc 0103 physical sciences 21.30.-x 13.75.Cs 010306 general physics Open shell Physics 21.10.-k ab initio 21.60.De 010308 nuclear & particles physics State (functional analysis) lcsh:QC1-999 Computational physics Perturbation theory (quantum mechanics) lcsh:Physics Excitation |
| Zdroj: | Phys.Lett.B Phys.Lett.B, 2018, 786, pp.448-452. ⟨10.1016/j.physletb.2018.10.029⟩ Physics Letters B, Vol 786, Iss, Pp 448-452 (2018) Physics Letters B Physics Letters B, Elsevier, 2018, 786, pp.448-452. ⟨10.1016/j.physletb.2018.10.029⟩ Physics Letters |
| ISSN: | 0370-2693 |
| Popis: | 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. 6 pages, 4 figures |
| Databáze: | OpenAIRE |
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