Cosmic ray heavy‐ion interactions: Recent JACEE results

Cosmic ray data from the JACEE experiments are reviewed for the study of high energy heavy‐ion interactions. Characteristics of nucleus‐nucleus collision events are summarized with regard to: [1] multiplicity and pseudo‐rapidity density; [2] transverse momentum; [3] high multiplicity events; [4] correlation of high 〈PT〉 and high multiplicity/energy density; and [5] rapidity fluctuations and pair correlation. Data seem to suggest varieties of new characteristics in the hadronic multiparticle production, some of which are not readily reducible to the simple superposition models of nucleon‐nucleon collisions.