Data were obtained using the streamer chamber spectrometer SKM-200 at a momentum of 4.5 GeV/c per incident nucleon. From the analysis of angular distributions of pi - mesons the anisotropy coefficient a for He-Li, He-C, C-Ne, C-Cu, C-Pb, O-Pb and Mg-Mg collisions was obtained. It has been shown that a is similar for symmetric systems of nuclei (He-Li and Mg-Mg) and increases slowly with mass numbers of projectile (Ap) and target (AT) for other pairs of nuclei. The anisotropy coefficient a increases linearly with the kinetic energy E*kin (in the CMS) for all pairs of nuclei. The qualitative agreement of our results with the predictions of the intranuclear cascade models has been observed.
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