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
Artikel, Zweitveröffentlichung, Verlagsversion
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Kurzbeschreibung (Abstract)
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.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2023 |
| Autor(en): | 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 |
| Art des Eintrags: | Zweitveröffentlichung |
| Titel: | No Core CI calculations for light nuclei with chiral 2- and 3-body forces |
| Sprache: | Englisch |
| Publikationsjahr: | 21 November 2023 |
| Ort: | Darmstadt |
| Publikationsdatum der Erstveröffentlichung: | 12 August 2013 |
| Ort der Erstveröffentlichung: | Bristol |
| Verlag: | IOP Publishing |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Journal of Physics: Conference Series |
| Jahrgang/Volume einer Zeitschrift: | 454 |
| (Heft-)Nummer: | 1 |
| Kollation: | 15 Seiten |
| DOI: | 10.26083/tuprints-00020730 |
| URL / URN: | https://tuprints.ulb.tu-darmstadt.de/20730 |
| Zugehörige Links: | |
| Herkunft: | Zweitveröffentlichung DeepGreen |
| Kurzbeschreibung (Abstract): | 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: | Verlagsversion |
| URN: | urn:nbn:de:tuda-tuprints-207309 |
| Zusätzliche Informationen: | 24th IUPAP Conference on Computational Physics (IUPAP-CCP 2012) |
| Sachgruppe der Dewey Dezimalklassifikatin (DDC): | 500 Naturwissenschaften und Mathematik > 530 Physik |
| Fachbereich(e)/-gebiet(e): | 05 Fachbereich Physik 05 Fachbereich Physik > Institut für Kernphysik |
| Hinterlegungsdatum: | 21 Nov 2023 10:39 |
| Letzte Änderung: | 27 Nov 2023 10:39 |
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| Suche nach Titel in: | TUfind oder in Google |
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- No Core CI calculations for light nuclei with chiral 2- and 3-body forces. (deposited 21 Nov 2023 10:39) [Gegenwärtig angezeigt]
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