Abstract
Based on the knowledge of the nature of primary cosmic rays inferred from the observations of gamma-ray family events with the largescale emulsion chamber experiments at Mt. Fuji and at Mt. Kanbala, the three-dimensional Monte Carlo simulation on the high-energy multiple-muon events has been carried out. By comparing the simulation results with the presently available observed ones, it is concluded that the hypothesis for the composition of primary cosmic rays being heavy-nuclei dominant, given from the analysis of gamma-ray family events, is quite consistent with the observed results on the lateral spread of multiple-muon events.
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