Central carbon-carbon collisions at 4.2 A GeV/c using: the experimental data coming from 2m propane bubble chamber; Dubna Cascade Model and Ultra relativistic Quantum Molecular Dynamics Monte Carlo codes have been studied in this thesis. The data has been analyzed with a new statistical method which is not sensitive to the background and doesn't require any prior information on the dynamics of the interaction. The obtained results show that the behavior of the nearest neighbor spacing momentum distributions of particles produced from 12CC collisions at 4.2 A GeV/c changes with multiplicity critically.