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No Core CI calculations for light nuclei with chiral 2- and 3-body forces

Maris, Pieter ; Aktulga, H. Metin ; Binder, Sven ; Calci, Angelo ; Çatalyürek, Ümit V. ; Langhammer, Joachim ; Ng, Esmond ; Saule, Erik ; Roth, Robert ; Vary, James P. ; Yang, Chao (2023)
No Core CI calculations for light nuclei with chiral 2- and 3-body forces.
In: Journal of Physics: Conference Series, 2013, 454 (1)
doi: 10.26083/tuprints-00020730
Article, Secondary publication, Publisher's Version

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Item Type: Article
Type of entry: Secondary publication
Title: No Core CI calculations for light nuclei with chiral 2- and 3-body forces
Language: English
Date: 21 November 2023
Place of Publication: Darmstadt
Year of primary publication: 12 August 2013
Place of primary publication: Bristol
Publisher: IOP Publishing
Journal or Publication Title: Journal of Physics: Conference Series
Volume of the journal: 454
Issue Number: 1
Collation: 15 Seiten
DOI: 10.26083/tuprints-00020730
Corresponding Links:
Origin: Secondary publication DeepGreen

The atomic nucleus is a self-bound system of strongly interacting nucleons. In No-Core Configuration Interaction calculations, the nuclear wavefunction is expanded in Slater determinants of single-nucleon wavefunctions (Configurations), and the many-body Schrödinger equation becomes a large sparse matrix problem. The challenge is to reach numerical convergence to within quantified numerical uncertainties for physical observables using finite truncations of the infinite-dimensional basis space. We discuss strategies for constructing and solving the resulting large sparse matrices for a set of low-lying eigenvalues and eigenvectors on current multicore computer architectures. Several of these strategies have been implemented in the code MFDn, a hybrid MPI/OpenMP Fortran code for ab initio nuclear structure calculations that scales well to over 200,000 cores. We discuss how the similarity renormalization group can be used to improve the numerical convergence. We present results for excitation energies and other selected observables for ⁸Be and ¹²C using realistic 2- and 3-body forces obtained from chiral perturbation theory. Finally, we demonstrate that collective phenomena such as rotational band structures can emerge from these microscopic calculations.

Status: Publisher's Version
URN: urn:nbn:de:tuda-tuprints-207309
Additional Information:

24th IUPAP Conference on Computational Physics (IUPAP-CCP 2012)

Classification DDC: 500 Science and mathematics > 530 Physics
Divisions: 05 Department of Physics > Institute of Nuclear Physics
Date Deposited: 21 Nov 2023 10:39
Last Modified: 09 Jan 2024 08:52
SWORD Depositor: Deep Green
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/20730
PPN: 514509139
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