An analysis of projectile fragments has been performed using 40Ar-emulsion interactions at 1.8A GeV. The interaction mean free path of "'Ar nuclei was obtained on the basis of 46W events which enabled us to calculate the total inelastic cross section. Correlations between the multiplicity of different charged particles were studied extensively to get an insight into the reaction mechanism. The average number of interacting nucleons of the projectile was calculated and compared with results from other experiments. Events with projectile fragments were divided into various reaction channels and several parameters like average emission angle and target particle multiplicities were studied as a function of target mass in different reaction channels. The projectile fragmentation properties were found to be independent of the target for peripheral collisions.

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Results are presented from an investigation of the mean free path in nuclear emulsion of multiply charged fragments, produced by 1.8^-GeV argon nuclei. Charge identification of 6965 fragments with charges Z ^ 2, producing 2192 secondary interactions, has been made. No dependence of the mean free path on the distance from the preceding collision is observed and thus our result is consistent with the nonexistence of anomalons.

The emission of Z = 2 projectile fragments has been studied in 40Ar-emulsion interactions at high energies (-1.8A GeV). The angular distributions of relativistic alphas could not be explained by a clean cut participant-spectator model. Therefore it is assumed that alphas were coming from two distinct sources differing drastically in their temperatures. It has been observed that the temperature required to reproduce the peak of the angular distribution is always -10 MeV for different categories of events while the temperature required to reproduce the tail ranges from 50 to 70 MeV. An attempt has been made to prepare samples that are rich in events where the alphas can be ascribed to a hot emission source.

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