3.7A GeV 4He, 16O, and 32S beams from Dubna Synchrophasotron interacting in nuclear
emulsion are used. The final state hadrons are approached by the produced shower particles. The
dependence on the system size is examined. The data are discriminated according to the emission
in the forward and backward zones over the 4p space. Minimum biased samples of events
corresponding to average impact parameters are selected randomly. The data are compared to a
simulation based on the modified FRITIOF event generator, implementing the Lund model string
dynamics. The multiplicity characteristics present an overview of the parameters obtained when
the distributions are fitted by the multisource thermal model. The forward emitted shower
particles are suggested to be created in hadronization system due to multisource superposition.
The backward emitted ones mostly result from target nucleus decay source in the framework of
the limiting fragmentation hypothesis. Empirical parameterizations based primarily on fitting
procedures are undertaken to fulfill the universality of some uniform relationships. Systematic
uncertainties are estimated in terms of standard deviation within errors.
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