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Title: Efficacy of the SU(3) scheme for ab initio large-scale calculations beyond the lightest nuclei

Journal Article · · Computer Physics Communications
 [1];  [2];  [3];  [3]; ORCiD logo [2];  [4];  [5];  [6];  [7];  [8]
  1. Academy of Sciences of the Czech Republic (ASCR), Prague (Czech Republic); Louisiana State Univ., Baton Rouge, LA (United States)
  2. Iowa State Univ., Ames, IA (United States)
  3. Louisiana State Univ., Baton Rouge, LA (United States)
  4. Czech Technical Univ., Prague (Czech Republic); Aerospace Research and Test Establishment, Prague (Czech Republic)
  5. Univ. of North Carolina, Charlotte, NC (United States)
  6. Univ. of Notre Dame, IN (United States)
  7. The Ohio State Univ., Columbus, OH (United States)
  8. 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
Citation Metrics:
Cited by: 32 works
Citation information provided by
Web of Science

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Cited By (3)

Exact isovector pairing in a shell-model framework: Role of proton-neutron correlations in isobaric analog states journal December 2019
Accelerating many-nucleon basis generation for high performance computing enabled ab initio nuclear structure studies journal March 2019
Exact isovector pairing in a shell-model framework: Role of proton-neutron correlations in isobaric analog states text January 2019