Abstract
Nuclear interactions in hydrogen and carbon by nucleon (a few to several tens of GeV) have been studied using a multiplate cloud chamber which contained paraffin, carbon and lead at mountain altitude. The cross-section for the nuclear interaction by nucleon-proton collision was found to be 60±17 mb, assuming the cross-section for nucleon-carbon nucleus 320 mb. Energy spectra of neutral pions produced in paraffin, graphite and lead were compared. The energy distribution of neutral pions in paraffin-interactions is more steep in low energy region and similar in high energy region compared with that in carbon-interactions, and possible interpretation will be given. Charged secondary particles are emitted isotropically in c.m. system in nucleon-nucleon collision, and in the carbon nucleus some secondary particles undergo secondary collisions in the same nucleus. The azimuthal angle distribution of secondary particles was examined and some comments will be mentioned.
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