Investigation of an angular distribution of protons in peripheral and   central nucleus-nucleus collisions at the momentum of 4.2 A GeV/c
  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. 
M.K. Suleymanov, O.B. Abdinov, N.S. Angelov, A.S. Vodopyanov, A.A.   Kuznetsov, Z.Ya. Sadigov