Study of formation time for secondary fast hadrons in hadron-nuclear interactions depending on quarks composition

When hadron-nuclear interactions are studied much attention is paid to behaviour of leading particles inside nucleus. Several years ago the following conception dominated. This is secondary particles that have at least one common quark with primary particle and impulse that is more than half the primary impulse can interact almost immediately. Earlier, in the course of studying energy-released particles generated in interactions of π- mesons with 40 GeV/s impulse with C nuclei in two meter propane chamber we have found out different behavior of leading π- and π+ mesons according to the number of proton collided in an nucleus. As π- and π+ -mesons consist of different quarks, the results obtained seemed to correspond to the said hypothesis. On the other hand considering quarks composition of π0 - mesons they may have common quark with impinging π- - meson. And this means their behavior should differ from π+ behavior and be closer to high energy π- . As slides of neutral ones in bubble cells are not seen, the analysis caused certain difficulties. Nevertheless we managed to to show that unlike the anticipated behavior, π- - meson behavior repeated π0 -meson behavior in quality that don't interact in nucleus. Thus, the existing model can't explain available experimental facts