Zenith angle dependence of cosmic ray shower development from observations of the time structure of atmospheric Cerenkov pulses

Physics

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Atmospheric Attenuation, Atmospheric Radiation, Cerenkov Radiation, Cosmic Ray Showers, Pulsed Radiation, Zenith, Background Radiation, Collimation, Photomultiplier Tubes, Time Measurement

Scientific paper

The atmospheric Cerenkov methods were applied to the investigation of extensive air showers over a range of zenith angles. The study of angle effects for vertical showers was applied to similar showers passing through different atmospheric thicknesses; and data were recorded in 1978-1979 at the University of Adelaide by a photomultiplier for viewing the sky with slight mechanical collimation for reducing the background light from large zenith angles. Collected measurements were correlated to an attenuation length of 234 + or - 38 g/sq cm for showers with sea-level dimensions of one million, showing that the Cerenkov pulse shape technique is a practical method of investigating air shower characteristics.

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