System size dependence of final state hadron sources atE_lab= 3.7 A GeV

Abstract

3.7 A 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 4π 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.