Tichai, Alexander ; Gebrerufael, Eskendr ; Vobig, Klaus ; Roth, Robert (2018)
Open-shell nuclei from No-Core Shell Model with perturbative improvement.
In: Physics Letters B, 786
doi: 10.1016/j.physletb.2018.10.029
Article, Bibliographie
This is the latest version of this item.
Abstract
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 groundand 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.
| Item Type: | Article |
|---|---|
| Erschienen: | 2018 |
| Creators: | Tichai, Alexander ; Gebrerufael, Eskendr ; Vobig, Klaus ; Roth, Robert |
| Type of entry: | Bibliographie |
| Title: | Open-shell nuclei from No-Core Shell Model with perturbative improvement |
| Language: | English |
| Date: | 2018 |
| Publisher: | Elsevier |
| Journal or Publication Title: | Physics Letters B |
| Volume of the journal: | 786 |
| DOI: | 10.1016/j.physletb.2018.10.029 |
| Corresponding Links: | |
| Abstract: | 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 groundand 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. |
| Additional Information: | Keywords: Perturbation theory, Ab initio, Many-body theory |
| Classification DDC: | 500 Science and mathematics > 530 Physics |
| Divisions: | 05 Department of Physics 05 Department of Physics > Institute of Nuclear Physics 05 Department of Physics > Institute of Nuclear Physics > Theoretische Kernphysik |
| Date Deposited: | 02 Aug 2024 12:38 |
| Last Modified: | 02 Aug 2024 12:38 |
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| Suche nach Titel in: | TUfind oder in Google |
Available Versions of this Item
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Open-shell nuclei from No-Core Shell Model with perturbative improvement. (deposited 09 Mar 2022 15:22)
- Open-shell nuclei from No-Core Shell Model with perturbative improvement. (deposited 02 Aug 2024 12:38) [Currently Displayed]
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