Efficacy of the SU(3) scheme for ab initio large-scale calculations beyond the lightest nuclei
- Academy of Sciences of the Czech Republic (ASCR), Prague (Czech Republic); Louisiana State Univ., Baton Rouge, LA (United States)
- Iowa State Univ., Ames, IA (United States)
- Louisiana State Univ., Baton Rouge, LA (United States)
- Czech Technical Univ., Prague (Czech Republic); Aerospace Research and Test Establishment, Prague (Czech Republic)
- Univ. of North Carolina, Charlotte, NC (United States)
- Univ. of Notre Dame, IN (United States)
- The Ohio State Univ., Columbus, OH (United States)
- Old Dominion Univ., Norfolk, VA (United States)
We report on the computational characteristics of ab initio nuclear structure calculations in a symmetry-adapted no-core shell model (SA-NCSM) framework. We examine the computational complexity of the current implementation of the SA-NCSM approach, dubbed LSU3shell, by analyzing ab initio results for 6Li and 12C in large harmonic oscillator model spaces and SU3-selected subspaces. We demonstrate LSU3shell’s strong-scaling properties achieved with highly-parallel methods for computing the many-body matrix elements. Results compare favorably with complete model space calculations and significant memory savings are achieved in physically important applications. In particular, a well-chosen symmetry-adapted basis affords memory savings in calculations of states with a fixed total angular momentum in large model spaces while exactly preserving translational invariance.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF); Iowa State Univ., Ames, IA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR)
- Grant/Contract Number:
- SC0008485; SC0005248; FG02-95ER-40934; DESC0008485; FG02-87ER40371; AC02-05CH11231; AC05-00OR22725
- OSTI ID:
- 1423773
- Alternate ID(s):
- OSTI ID: 1358995
- Journal Information:
- Computer Physics Communications, Vol. 207, Issue C; ISSN 0010-4655
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Exact isovector pairing in a shell-model framework: Role of proton-neutron correlations in isobaric analog states
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journal | December 2019 |
Accelerating many-nucleon basis generation for high performance computing enabled ab initio nuclear structure studies
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journal | March 2019 |
Exact isovector pairing in a shell-model framework: Role of proton-neutron correlations in isobaric analog states | text | January 2019 |
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