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From 1540 inelastic interactions of 3.7 A GeV 16O projectile with emulsion nuclei, we select samples of 87 and 61 events carefully due to interactions of neutron (n) and singly charged particles (Z = 1), respectively. New results concerning the topology of such events are investigated. The average multiplicities of secondary relativistic particles that appear as shower tracks for n and Z = 1 stay more or less constant when compared with analogous data on p-Em at similar energy. The multiplicity distributions and the average values of the various secondary charged particles are studied and compared with the corresponding predictions by the cascade evaporation model. The results assume that the n or Z = 1 from 16O collide peripherally with an emulsion target and are considered as an expansion to the N-N collisions.

Topology of 28 Si fragmentation at 14.6 A GeV in emulsion nuclei is given. In all events, the charge of each projectile fragment is measured. We report the measurements on total and some partial reactions cross sections of 28 Si interactions. The data for Z 6 can be qualitatively described by a statistical percolation model. The results are discussed and compared with those obtained from 28 Si at 3.7 A GeV and 32 S at 200 A GeV.

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The measurements of partial production cross-sections of the multiple helium fragments emitted at 14.6 A GeV 28Si–emulsion interactions are reported. The production rate of helium fragments due to fragmentation of 28Si ions is studied and compared with that obtained from different projectiles at various energies. The dependence of ⟨Nα⟩ on the mass number of the incident beams is formulated. The multiplicity distributions of the helium fragments produced in 14.6 A GeV and 3.7 A GeV 28Si aswell as 200 A GeV 32S exhibit KNO scaling. The characteristics of He-multiplicity events associated with and without projectile fragments of charge Z ⩾ 3 are investigated.