Production of fast and slow particles in nucleus-nucleus collisions at ultrarelativistic energies.

Abstract

Multiplicity and angular distributions of shower, grey, and black particles produced in the interactions of $^{32}\mathrm{S}$ at 200A GeV, $^{16}\mathrm{O}$ at 200 and 60A GeV, and $^{4}\mathrm{He}$ at \ensuremath{\sim}140A GeV in emulsion are compared with the predictions of a Monte Carlo code which takes into account the internuclear cascading. The correlations between the various parameters belonging to the same or to the different kinds of particles are discussed. The data on shower and grey particles from all the beams are well described by the code. However, the black prong data show a significant departure from this model.