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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. (Publisher's Version)
In: Physics Letters B, 786, pp. 448-452. Elsevier, ISSN 0370-2693, e-ISSN 1873-2445,
DOI: 10.26083/tuprints-00012720,
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Item Type: Article
Origin: Secondary publication
Status: Publisher's Version
Title: Open-shell nuclei from No-Core Shell Model with perturbative improvement
Language: English
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.

Journal or Publication Title: Physics Letters B
Journal volume: 786
Publisher: Elsevier
Classification DDC: 500 Naturwissenschaften und Mathematik > 530 Physik
Divisions: 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 09:56
DOI: 10.26083/tuprints-00012720
Corresponding Links:
URN: urn:nbn:de:tuda-tuprints-127208
Additional Information:

Keywords: Perturbation theory, Ab initio, Many-body theory

URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/12720
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