Efficacy of the SU(3) scheme for ab initio large-scale calculations beyond the lightest nuclei
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.
- Authors:
-
[1];
[2];
[3];
[3];
[2] ; [4]; [5]; [6]; [7]; [8]
- 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)
- Publication Date:
- Grant/Contract Number:
- SC0008485; SC0005248; FG02-95ER-40934; DESC0008485; FG02-87ER40371; AC02-05CH11231; AC05-00OR22725
- Type:
- Accepted Manuscript
- Journal Name:
- Computer Physics Communications
- Additional Journal Information:
- Journal Volume: 207; Journal Issue: C; Journal ID: ISSN 0010-4655
- Publisher:
- Elsevier
- Research Org:
- Iowa State Univ., Ames, IA (United States)
- Sponsoring Org:
- USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR) (SC-21)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 74 ATOMIC AND MOLECULAR PHYSICS; Nuclear structure; Ab initio methods; Shell model; Models based on group theory
- OSTI Identifier:
- 1423773
- Alternate Identifier(s):
- OSTI ID: 1358995