  The experimental results on the relation between the number of events, the
angular distributions of protons and full number of protons are presented for
${}^{12}CC$-interactions at the momentum of 4.2 A GeV/c. The influence of
nuclear fragmentation process on the results is also considered. The obtai- ned
results confirm the assumption that there exist the critical phenomena among
the central collisions and it is necessary to use a percolation approa- ch for
the full description of the central collisions.
