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

Thesis/Dissertation ·
DOI:https://doi.org/10.2172/1326837· OSTI ID:1326837
 [1];  [2];  [3];  [3];  [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). Dept. of Electrical and Computer Engineering
  8. Old Dominion Univ., Norfolk, VA (United States)
+ Show Author Affiliations

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 SU(3)-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 signi cant memory savings are achieved in physically important applications. In particular, a well-chosen symmetry-adapted basis a ords memory savings in calculations of states with a fixed total angular momentum in large model spaces while exactly preserving translational invariance.

Research Organization:
Ames Lab., Ames, IA (United States)
Sponsoring Organization:
USDOE
DOE Contract Number:
AC02-07CH11358
OSTI ID:
1326837
Report Number(s):
IS-J 9068
Country of Publication:
United States
Language:
English

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Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS