A Multi-Particle Generation Scheme through Energy Discretization in GEANT4 Simulations for Atmospheric Applications

Various types of particles constitute the primary cosmic ray beam at the top of the Earth's atmosphere, and these different particles might have separate roles depending on the purpose of a specific atmospheric application. In this study, a recipe that performs the simultaneous injection of diverse particles in the GEANT4 framework is demonstrated in order to mimic this property. This scheme is based on the utilization of multiple probability grids that are governed by the initial flux ratios, and the algorithms of this multi-particle generation are exhibited by using the primary cosmic proton flux as well as the primary cosmic alpha flux measured from the BESS-TeV spectrometer. It is revealed that this multi-particle generation method can be advantageous for a range of atmospheric applications, particularly in the areas where precise particle interaction modeling is required.