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Open-shell nuclei from No-Core Shell Model with perturbative improvement

Tichai, Alexander ; Gebrerufael, Eskendr ; Vobig, Klaus ; Roth, Robert (2022)
Open-shell nuclei from No-Core Shell Model with perturbative improvement.
In: Physics Letters B, 2018, 786
doi: 10.26083/tuprints-00012720
Article, Secondary publication, Publisher's Version

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: 2022
Creators: Tichai, Alexander ; Gebrerufael, Eskendr ; Vobig, Klaus ; Roth, Robert
Type of entry: Secondary publication
Title: Open-shell nuclei from No-Core Shell Model with perturbative improvement
Language: English
Date: 2022
Year of primary publication: 2018
Publisher: Elsevier
Journal or Publication Title: Physics Letters B
Volume of the journal: 786
DOI: 10.26083/tuprints-00012720
URL / URN: https://tuprints.ulb.tu-darmstadt.de/12720
Corresponding Links:
Origin: Secondary publication
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.

Status: Publisher's Version
URN: urn:nbn:de:tuda-tuprints-127208
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: 09 Mar 2022 15:22
Last Modified: 10 Mar 2022 08:28
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