Journal
ASTROPHYSICAL JOURNAL
Volume 557, Issue 2, Pages 686-699Publisher
IOP PUBLISHING LTD
DOI: 10.1086/322240
Keywords
cosmic rays; ISM : abundances
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We study the spectrum and average mass composition of cosmic rays with primary energies between 10(17) and 10(18) eV using a hybrid detector consisting of the High Resolution Fly's Eye (HiRes) prototype and the Michigan Muon Array (MIA). 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 from 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 x 10(17) eV.
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