A method of analysing the data of high energy jet showers in nuclear emulsions is proposed. We discuss the possibilities to reduce the nucleon-nucleon collisions to pion-nucleon interactions. If we use the experimental data on π--p collision at 5 Gev as the pion-nucleon interaction, we can estimate the energy and angular distribution of emitted pions in rather low energy jet showers (≲ 100 Gev) and the obtained results fairly agree with the experiments. As to the high energy jet showers (≳ 100 Gev) we can conclude that almost all of collisions are regarded as peripheral ones and that the properties of the pion-nucleon interaction reduced from the nucleon-nucleon collision are similar to those of the pion-nucleon interaction actually observed. It is also suggested that the nucleon has a core whose radius is about a nucleon Compton wave length.
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Yajima et al. (1960) studied this question.