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In the paper experimental results obtained by studying of collective andfractal properties of soft pion jets in the space of relative four-dimensionalvelocities in intermediate energy domain 2 - 20 GeV are presented. Fractionalvalues of cluster dimension are indicated on manifestation of fractal-likeproperties by pion jets. The changes of the mean square of the distance betweensecondary particles and jet axis, the mean kinetic energy of particles in jetsand the cluster dimension with increasing of collision energy agree with thehypothesis of manifestation of quark degrees of freedom in processes of pionjet production at intermediate energies. For the first time the quantitativeestimations are obtained for the low boundary energy at which quark degrees offreedom start to display itself in production of soft pion jets experimentally.The value of estimation for this parameter derived with taking into account ofall used collective parameters is (2.8 \pm 0.6) GeV.

Dependence of soft pion jet properties in the space of relative four-dimensional velocities on initial energy