A hybrid electronic-counter–emulsion-chamber instrument was exposed to high-energy cosmic rays on a balloon. The data on 105 nucleus-nucleus collisions in the energy range 20–65 GeV/nucleon and for incident nuclear charges 22≤$Z_p$≤28 are presented. Inclusive characteristics of particle production on different targets (plastic, emulsion, and lead) are shown and compared with models based on the superposition of nucleon-nucleus interactions. Features of a subset of the more central collisions with plastic target and some characteristics of individual events with the highest multiplicity of produced particles are described.

• Received 18 April 1986

DOI:https://doi.org/10.1103/PhysRevD.35.824