Abstract
The frequency of coincident penetrating particles crossing an area 30 m2 at large zenith angles has been measured, and comparison is made with the results of calculations based upon a model of propagation of the EAS through the atmosphere. The experimental results regarding the rate of recording showers as a function of zenith angle do not agree with a mean transverse momentum of secondaries, in high-energy interactions, of 400 MeV/c, but indicate a value of 800 MeV/c. The variation of rate with zenith angle follows a [Formula: see text] law at large zenith angles. The density spectrum of the showers at large zenith angles has also been measured, and for the larger recorded densities this result is in better agreement with the theory incorporating a mean transverse momentum of 400 MeV/c than that incorporating a value of 800 MeV/c.
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