  The present study is based on the interactions caused by 340-GeV negative
pions with emulsion nuclei. The main aim of this paper is to investigate some
aspects of central collision events. Thus, the events in which the total number
of charged shower particles is greater than or equal to twenty eight (Ns geq
28) were chosen for the analysis. They are not exactly central collision
events, but may be considered as pseudo-central collision events. The angular
characteristics of relativistic charged secondaries have been studied in terms
of pseudo-rapidity, and bimodality is found to be absent in the distributions.
The mean pseudo-rapidity seems to be independent of grey and heavy particle
multiplicities, which indicates its independence with number of collisions.
Finally, the correlation between different particle multiplicities in this
paper is discussed.
