Results of cosmic-ray experiments with emulsion chambers

The results of experiments with X-ray emulsion chambers performed at SINP over the last 40 years are considered. Wide-ranging experiments to study cosmic rays by this technique were begun at SINP in 1968 with the active support of S.N. Vernov, whose 100th birthday we celebrate in 2010. As a result, the most extensive measurements of cosmic-ray muon spectra were made, the ultrahigh-energy hadron interaction characteristics in the Pamir experiment were investigated, and data on the mass composition of primary cosmic rays in stratospheric experiments were obtained. We took part in these experiments and in the experimental data analysis. The experience of working with emulsion material gained over many years is currently being used in the OPERA experiment to study neutrino oscillations.