抄録
A large emulsion cloud chamber (E. C. C.) carried by a balloon was exposed at high altitude (October, 1963, Kobe). The characteristics of the interactions of high energy cosmic ray particles (\gtrsim1013 eV) with other nuclei were examined. Forty-two events with energies higher than 1012 eV were observed, from which the events of nuclear interactions in the carbon producer were selected. The transverse momenta of γ-rays which were the decay products of π°-mesons emitted from jets were estimated at 230 MeV/c (assuming that the Pt distribution of γ-ray resembles that of π°’s, and the average Pt value of π° is about twice that of γ). The curve of Pt distribution does not fit the Gaussian form. In the energy region of about 1012 eV, the energy spectrum can be fit by single power laws of 1.50±0.42 for ΣEγ, and 1.60±0.25 for Eγ. There is no correlation between Pt and Eγ.
