Large-scale ab initio configuration interaction calculations for light nuclei
- Iowa State Univ., Ames, IA (United States)
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Univ. of Notre Dame, IN (United States)
- The Ohio State Univ., Columbus, OH (United States)
- Old Dominion Univ., Norfolk, VA (United States)
- 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
Web of Science
Similar Records
Natural orbitals for theab initiono-core configuration interaction approach
Input/Output of ab-initio nuclear structure calculations for improved performance and portability