High Energy Cosmic-Ray Showers in Nuclear Emulsions

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Abstract
A detailed and statistical study of high energy events in nuclear emulsions exposed at high altitudes has given some information on a model to describe the showers found in cosmic rays. There is evidence shown that shower multiplicity increases with primary energy. Differences in the behavior of events from heavy and light nucleus collisions are described. From multiplicity and angular spread of the tracks in individual events, arguments are presented to support a pluromultiple model for meson production in high energy collisions with a nucleus.