From 1540 inelastic interactions of 3.7A 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 cascade evaporation model (CEM). The results assume that the n or Z=1 from 16O collide peripherally with emulsion target and are consider as an expansion to the N-N collisions.