Abstract

A new method of detecting high energy events has been developed by exposing an apparatus to cosmic ray electrons and photons at Mt. Norikura (730 g/cm 2). The apparatus of consists of an emulsion chamber and spark chambers, and an electronic cascade shower developed in the former can be located with the aid of black spots marked on X-ray films inserted in the latter. It has been demonstrated that a cascade shower of energy down to ∼ 15 GeV can be detected with considerable ease in the emulsion chamber. This method is thus proved useful in the investigation of high energy interactions.

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