Abstract

Results of cosmic-ray experiments on hadronic interactions are reviewed. Attention is focussed on emulsion chamber experiments which cover the energy region E 0 = 10 13−10 16eV, and beyond. The topics covered are: a) production spectrum of gamma-rays and charged hadrons in a jet and comparison with accelerator data; b) the mass spectrum of fire-balls and its discreteness; c) Centauro and Mini-Centauro interactions with multiple production of baryons; d) binocular families and the geminion hypothesis. Hadronic interaction in this energy region are characterized by the appearance of heavy-fire-balls which are not seen in the present accelerator region. Heavy fire-balls show various decay modes, such as into pions with large multiplicity and large p t , into a number of baryons without association of pions, and into two particles with large Q-value.

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