Abstract
An account is given of experiments on the momentum spectrum of the particles in extensive air showers at sea-level. The results are consistent with an integral spectrum of the form N(>E) α (E+Ec)-(1.1±0.3), where Ec is the critical energy in air. Penetrating particles are found in some of the denser showers, the ratio of penetrating particles to electrons being (0.8±0.4)%.
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