抄録
Fifty-two nuclear interactions produced by the nuclei of cosmic radiation with charge Z=6, 7 and 8, and with energies around 4×1010 eV/nucleon were studied in nuclear emulsions. The ratio of the number of interactions with heavy nuclei (Ag and Br) to that with light nuclei (H, C, N and O) was found to be 1.03, which is in good agreement with the value calculated by assuming the geometrical cross sections of the colliding nuclei. The features of interactions in which the colliding volume of an incident nucleus was equal to that of an alpha-particle were similar to those of a free alpha-particle. The average number of heavily ionizing tracks, Nh, indicated the exponential increase as the impact parameter decreased. The distribution of the total charge of the fragments showed rather regular bumps at even charge. Almost all shower particles ejected with the smallest angles to the primary direction (shower axis) were the nucleons which came from primary nuclei. The angular distribution of mesonic shower particles was nearly isotropic in C. M. system at these energies.
