Abstract
Penetrating showers from hydrogen and carbon (average energy about 30 GeV) have been studied by CH2-C subtraction method with a counter hodoscope at mountain altitude. The cross-section for meson production in hydrogen was found to be 67 ± 25 mb and that for multiple production appears to be at least about 70 percent of this value. No difference in the cross-sections for p-p and n-p collisions was observed. The augular distribution of the charged shower secondaries seems to show a forward peak in the p-p collisions and this tendency may be interpreted by the hypothesis that the incident nucleon is emitted into a rather sharp forward cone in the C.M. system, at least when the multiplicity is small.
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