Experimental study on 3.7A GeV 16O interactions with emulsion nuclei is carried out. The shower particle multiplicity characteristics are investigated. Data are presented in terms of the number of emitted particles in both forward and backward angular zones. The dependence on the target size is presented. For this purpose the statistical events are discriminated into groups according to the interactions with H, CNO, Em, and AgBr target nuclei. The separation of events, into the mentioned groups, is executed basing on Glauber's multiple scattering theory approaches. Features suggestive of a decay mechanism seem to be a characteristic of the backward emission. This emission may be during the de–excitation of the excited target nucleus, in a behavior like that of compound–nucleus disintegration. Regarding the limiting fragmentation hypothesis beyond 1A GeV, the target size is the main parameter affecting the backward production. The incident energy is a principle factor responsible for the forward emitted particle production in a creation system. However, the target size is an effective parameter as well as the projectile size considering the geometrical concept regarded in the nuclear fireball model. The data are simulated in the framework of the Lund Monte Carlo simulation code, the so–called modified FRITIOF model. The multisource thermal model can predict source numbers, may be responsible for particle production.
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