We discuss some properties of the central π--meson carbon reactions at 40 GeV/c. While these results were obtained many years ago they have not been explained completely. We attempt to interpret following: results regime change on the behavior of some characteristics of the events as a function of the centrality; anomaly peak on the angular distributions of the slow protons emitted in these reactions; charge asymmetry on the π--mesons production in the back hemisphere in lcs.
Understanding of the results could help to explain the new ones coming from the modern central experiments at high and ultrarelativistic energies.