Abstract
A multiplate cloud chamber, triggered by G.M. counters, has been operated at 3 500 metres a.s.l. to collect high energy nuclear interactions in lead by cosmic ray protons. A study is made of the development of the nuclear cascade in lead. The angular distribution of the secondary interacting particles, the characteristics of the successive interactions of the cascade, the mean free path for nuclear interaction of the secondary ionizing particles have been analyzed. For the shower particles produced in high energy interactions (by protons of mean energy 50 GeV) similar to thejets of nuclear emulsions, the mean free path is found to be geometrical. Associated with the 786 interactions seen in the chamber. 15 V0 and 3 V± particles have been observed. The distribution of the angles between the production plane and the decay plane of the V0 is given.
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