Prospects for RAON Experiments with the KISTI-6 Supercomputer

Abstract The RAON (Rare isotope Accelerator complex for ON-line experiments), a heavy-ion accelerator facility in Korea is entering a new era of precision nuclear physics experiments including studies of exotic nuclei near the neutron drip line. In this work, we demonstrate how RAON experiments benefit directly from large-scale simulations performed on national supercomputing systems. Using the KISTI-5 supercomputer (Nurion, 25.7 PF), we carried out Geant4-based beam simulations and extensive ab initio nuclear-structure calculations that supported the determination of nuclear charge radii for neutron-deficient sodium isotopes. These large-scale computations reduced experimental uncertainties, optimized beam-time usage and improved the interpretation of RAON measurements by providing quantitative guidance on beam dynamics and detector performance. The forthcoming KISTI-6 GPU-accelerated supercomputer, delivering a peak performance of 600 PF, will substantially extend these capabilities. Its massively parallel and heterogeneous architecture enables ab initio calculations with higher Nmax​ truncations for light and medium-mass nuclei, large-scale nuclear lattice effective field theory (NLEFT) simulations for heavy systems with A  ≈ 100 − 200, and comprehensive reaction-network modeling relevant to RAON science goals. In addition, KISTI-6 supercomputer will support systematic uncertainty quantification through large Monte Carlo ensembles and provide more efficient feedback cycles among theory, simulation and experiment. The synergy between RAON experiments and the KISTI-6 supercomputer will advance nuclear structure research. It will set new benchmarks at the exa-scale level. It will also pave the way for discoveries in both fundamental nuclear properties and applications in the nuclear theory modeling. PACS numbers: 24.10.Lx, 24.10Cn, 02.70.-c, 02.70.Uu