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Title: Large-scale ab initio configuration interaction calculations for light nuclei

Journal Article · · Journal of Physics. Conference Series
 [1];  [2];  [3];  [4];  [2];  [1];  [1];  [4];  [5];  [1];  [2];  [6]
  1. Iowa State Univ., Ames, IA (United States)
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  3. Univ. of Notre Dame, IN (United States)
  4. The Ohio State Univ., Columbus, OH (United States)
  5. Old Dominion Univ., Norfolk, VA (United States)
  6. Wuhan Univ. (China)

In ab-initio Configuration Interaction calculations, the nuclear wavefunction is expanded in Slater determinants of single-nucleon wavefunctions and the many-body Schrodinger 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 matrix eigenvalue problems 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 can scale to 100,000 cores and more. Finally, we will conclude with some recent results for 12C including emerging collective phenomena such as rotational band structures using SRG evolved chiral N3LO interactions.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF); Iowa State Univ., Ames, IA (United States); University of Notre Dame, IN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR)
Grant/Contract Number:
AC05-00OR22725; FC02-09ER41582; FG02-87ER40371; FG02-95ER40934
OSTI ID:
1567305
Journal Information:
Journal of Physics. Conference Series, Vol. 403; Conference: Horizons of Innovative Theories, Experiments, and Supercomputing in Nuclear Physics (HITES) Conference, New Orleans, LA (United States), 4-7 Jun 2012; ISSN 1742-6588
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 25 works
Citation information provided by
Web of Science

References (18)

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Structure of A = 10 13 Nuclei with Two- Plus Three-Nucleon Interactions from Chiral Effective Field Theory journal July 2007
Coulomb-Sturmian basis for the nuclear many-body problem journal September 2012
Ab initio no-core full configuration calculations of light nuclei journal January 2009
Convergence in the no-core shell model with low-momentum two-nucleon interactions journal March 2008
Ab initio nuclear structure – the large sparse matrix eigenvalue problem journal July 2009
Scaling of ab-initio nuclear physics calculations on multicore computer architectures journal May 2010
Topology-Aware Mappings for Large-Scale Eigenvalue Problems book January 2012
Effcient Shared-array Accesses in Ab Initio Nuclear Structure Calculations on Multicore Architectures journal January 2012
Origin of the Anomalous Long Lifetime of C 14 journal May 2011
Similarity-Transformed Chiral N N + 3 N Interactions for the Ab Initio Description of C 12 and O 16 journal August 2011
Highly deformed modes in the ab initio symplectic no-core shell model journal July 2008
Importance truncation for large-scale configuration interaction approaches journal June 2009
Monte Carlo shell model for atomic nuclei journal January 2001
Solution of the Center-Of-Mass Problem in Nuclear Structure Calculations journal August 2009

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