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

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• 作者：T. Dytrych^a ; ^b ; ^{dytrych@ujf.cas.cz" class="auth_mail" title="E-mail the corresponding author} ; P. Maris^c ; K.D. Launey^b ; J.P. Draayer^b ; J.P. Vary^c ; D. Langr^d ; ^e ; E. Saule^f ; M.A. Caprio^g ; U. Catalyurek^h ; ⁱ ; M. Sosonkina^j
• 关键词：Nuclear structure ; Ab initio methods ; Shell model ; Models based on group theory
• 刊名：Computer Physics Communications
• 出版年：2016
• 出版时间：October 2016
• 年：2016
• 卷：207
• 期：Complete
• 页码：202-210
• 全文大小：987 K

文摘

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.