Study of leading neutral pions: (interactions of cosmic rays with matter at energies above 3 TeV)

An experimental plant consisting of a full-automatic ionized colorimeter of 44m2, electronics of which is based on modern integral schemes and performed in CAMAC standard; of an x-ray emulsion chamber and of changeable dense target is described. The plant permits to measure the energy of a primary particle, as well as to study in detail a neutral component of products of strong indifferent target atoms. Experimental data on leading neutral mesons with energy from 10 GeV to the cosmic particle energies are analysed using the plant. A new experiment, which aim is the detection of interactions with anomalously great multiplicity and study of microstructure of extensive air showers, is suggested. 277 refs