Angular and Abundance Distribution of High-energy Gamma Rays and Neutrons Simulated by GEANT4 Code for Solar FlaresK. Kamiya, K. Koga, H. Matsumoto, Y. Muraki and S. ShibataEPJ Web Conf., 208 (2019) 14005DOI: https://doi.org/10.1051/epjconf/201920814005