Some results on heavy- and shower-particle multiplicities produced in interactions of 340-GeV pions in nuclear emulsion are presented and compared with similar results in proton-nucleus interactions at different energies. Values of $〈N_g〉$ in ${\pi }^{-}A$ interactions are found to be less than its value in $pA$ interactions at similar energies. This is understood in terms of additive quark model. The result on mean normalized multiplicity reveals that the values of $R_{A1\mathrm{}}$ are almost constant in the forward direction for all values of $〈\nu \left(N_g\right)〉$ and $R_{A1\mathrm{}}$ increase with $〈\nu \left(N_g\right)〉$ in the intervals $1.2<\mathrm{}\eta \le 2.0$ and $\eta \le 1.2$.

• Received 26 October 1989

DOI:https://doi.org/10.1103/PhysRevD.42.2187