Processing high-energy proton events: A new approach to searching for primary cosmic ray particles in emulsion chambers, using data from the RUNJOB experiment

Abstract

Primary single-charged particles were identified in ∼50% of the proton events in the Russian-Japanese RUNJOB balloon experiment. In reprocessing the experimental data obtained via long-term exposure of the RUNJOB-3B, 6A, 11A, and 11B emulsion chambers (ECs) using a new approach to searching for primary cosmic-ray particles in groups of proton events with primary particle energy E0 > 20 TeV and zenith angle tan(θ) ≤ 5, ∼50% of the primary single-charged particles went unidentified, as was the case earlier. In this work, we describe the new approach to searching for and tracking particles in ECs and present the parameters of the processed events (energy, zenith angle, depth of particle penetration into an EC up to interaction).