Speaker
Description
Sokhna Bineta Lo Amar (1, 2)
Paul Gueye (2)
Oumar Ka (1)
(1) Cheikh Anta Diop University (UCAD), Dakar (Senegal)
(2) Facility For Rare Isotope Beams (FRIB), Michigan State University (USA)
Abstract. The study of unstable nuclei far from β-stability through fragmentation of heavy ion beams is one the most used approaches in low to intermediate energy nuclear physics to gain insights into their nuclear structure and the reaction mechanisms. The Facility for Rare Isotope Beam (FRIB) started its operation in May 2022 and is expected to produce upward of 1,000 predicted new isotopes for basic and applied nuclear science research. FRIB uses intensively the LISE++ and GEANT4 tools to model experimental setups. However, a comprehensive and systematic validation of these two codes against each other is lacking. This communication presents a comparative study of the distributions of the total cross section and production yield of rare isotopes using these two software tools.
140 MeV/u beam of 40Ar is used to interact with a 9Be target through the fragmentation process. Five GEANT4 physics models (Shielding, QGSP_BERT, QGSP_BIC, FTFP_BERT and QBBC) have been identified as adequate to describe these reactions. Their predictions are compared to those from LISE++ through its empirical tool (i.e., EPAX), which is a universal parameterized formula. The preliminary comparative results (Figure 1) show a good agreement of the fragmentation reaction between LISE++ and GEANT4, even if the pick-up process needs to be reviewed and improved in order to obtain a complete validation.
The identification of the discrepancies between the two codes, opens up the path to develop a systematic validation suite to benchmark each code for their future released versions and provide guidance of their physics usage to the low- and high-energy nuclear physics communities.
Keywords: Fragmentation reaction - GEANT4 - LISE++ - EPAX
