Abstract
High-energy γ-rays were detected in an emulsion chamber (6.4 m2 at Mt. Norikura (738 g cm−2) together with air showers involving γ-rays. Under a triggering condition of burst density beneath the emulsion chamber, 1350 air showers were obtained during 95 days. The maximum density of burst among the 24 burst detectors was greater than 7000 particles/0.25 m2 for 118 showers and also greater than 4500 for 321 showers. On the other hand, 271 γ-ray events with energy flow greater than 1 TeV were found in the emulsion chamber. After analysis 101 combined events of air showers and γ-rays were obtained. The sizesN of the air showers with high bursts are widely distributed from 103 to 107, and their age parameterss are smaller than 1. Large γ-ray bundles are always involved in air showers ofN>3·104. The number of γ-ray members in a bundle is proportional toN 1/2/c, wherec=30 for the largest bundles in every interval of the shower size. The fractional ratio of the top γ-ray energyvs. the total energy ΣE γ in a bundle decreases gradually with the total energy in proportion to (ΣE γ)−1/2, while the average energies of the individual γ-rays are nearly independent of the total energy. Extended γ-ray bundles whose members are mutually separated beyond 50 cm were not found. The spectra of the burst density and of the γ-ray energy, and also their relation are presented.
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