Measurement of the Cosmic Ray Energy Spectrum and Composition from 1017 to 1018.3 eV Using a Hybrid Fluorescence Technique
Abstract
We study the spectrum and average mass composition of cosmic rays with primary energies between 1017 eV and 1018 eV using a hybrid detector consisting of the High Resolution Fly's Eye (HiRes) prototype and the MIA muon array. Measurements have been made of the change in the depth of shower maximum as a function of energy. A complete Monte Carlo simulation of the detector response and comparisons with shower simulations leads to the conclusion that the cosmic ray intensity is changing f rom a heavier to a lighter composition in this energy range. The spectrum is consistent with earlier Fly's Eye measurements and supports the previously found steepening near 4 × 1017 eV .
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