Results of cosmic-ray experiments on hadronic interactions are reviewed. Attention is focussed on emulsion chamber experiments which cover the energy region E0= 1013−1016eV, 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 pt, into a number of baryons without association of pions, and into two particles with large Q-value. © 1980, All rights reserved.
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