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

0464150 - ÚJF 2017 RIV NL eng J - Článek v odborném periodiku
Dytrych, Tomáš - Maris, P. - Launey, K. D. - Draayer, J. P. - Vary, J. P. - Langr, D. - Saule, E. - Caprio, M. A. - Catalyurek, U. - Sosonkina, M.
Efficacy of the SU(3) scheme for ab initio large-scale calculations beyond the lightest nuclei.
Computer Physics Communications. Roč. 207, OCT (2016), s. 202-210. ISSN 0010-4655. E-ISSN 1879-2944
Grant CEP: GA ČR GA16-16772S
Institucionální podpora: RVO:61389005
Klíčová slova: nuclear structure * Ab initio methods * Shell model * models based on group theory
Kód oboru RIV: BE - Teoretická fyzika
Impakt faktor: 3.936, rok: 2016

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 Li-6 and C-12 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.
Trvalý link: http://hdl.handle.net/11104/0263163