Proton-proton interactions above 100 GeV have been studied in an experiment using cosmic-ray protons interacting in a liquid hydrogen target. From several hundred hydrogen interactions, it has been learned that: (a) the total inelastic pp cross section is not changing significantly with energy above 30 GeV; (b) the multiplicity distributions of charged prongs agree with a Poisson distribution in charged-particle pairs; (c) the average charged prong multiplicity increases as in s; (d) the

more »

... distribution of charged particles agrees with a c.m. momentum distribution of charged particles that varies as exp exp [-8 p~ -8x 2] d3p/E (where x = PL/Po) and a nucleon distribution that varies as 10x exp [-3 p~] d3p/E for 0.05 < x < 0.85. Further properties of the angular distributions, characteristics of the ionization calorimeter, the cross section in iron, and other features of the data are reported.