Transition to the Region of Central Collisions

The experimental results on the behaviour of the characteristics of secondary particles depending on the disintegration degree of nuclei are used to determine the region of central collisions. It was therefore possible that : – the correlation between the prosesses of total disintegration of nuclei and the central collisions of nuclei had been shown; – the existence of the regime change points in the behaviour of the considered characteristics of secondary particles depending on the disintegration degree of nuclei had been observed in the other earlier experiments as well. The number of all protons in CCinteractions at the momentum of 4.2 A GeV/c obtained from the 2-m propane bubble chamber exposed at the Dubna machine is considered as a disintegration degree of nuclei. The experimental results demonstrate that there are cases corresponding to the critical phenomena among the events with the central collisions of nuclei. For CCinteraction the behaviour of the number of the events, depending on Q also depends on the number of fragments and has a two–steps form. This result could be explained by the existence of nuclear clusters. Key-words: disintegration degree, central collisions, regime change points, number of all protons, CCinteractions,2-m propane bubble chamber, 4.2 A GeV/c,culster