Abstract
Usually it is believed that the energy of extensive air showers (EAS) is equal or is proportional to the energy of primary particle. Of course, taking into account fluctuations in hadron interactions and in the EAS development, some difference between the energies of the EAS and PCR appears but the slopes of the spectra must be the same with a good accuracy. In this talk, an alternative approach, in which the model of PCR interaction at the knee energy is drastically changed, is considered. The consequences for interpretation of results on primary energy spectrum and composition in frame of this model are analyzed. The results agree with experimental data. Some possible experiments to check the predictions of this approach are discussed.
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