Transition of Extensive Air Showers in the Atmosphere

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Abstract
The transition of Extensive Air Shower (EAS) in the atmosphere had been estimated so far from the data of zenith angle distribution, atmosheric pressure effect etc. assuming that (a) the starting point of EAS is close to the top of the atmosphere and that (b) the lateral distribution function of charged particles is unique for all EAS. As a result of present experiment, it has been concluded that (a) there are various cases of different lateral structure in observed EAS, (b) the interaction mean free path to build up the EAS is estimated as about 100 g/cm 2 , and (c) the inelasticity in high energy nuclear interaction is estimated as high as about 0.7. The age parameter distribution of observed EAS suggests wide range distribution of EAS production level as well as various attenuation character for individual FAS. These problems are discussed and an experiment using water is proposed to make above points clear. The preliminary results are also shown.

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