Abstract
The HiRes stereo uorescence detector can precisely measure the profile of the extensive air showers caused by ultra-high energy cosmic ray particles. The distribution of the depth of the air shower maxima, Xmax, can serve as an indication of the atomic mass of the cosmic particles. It can also be used to measure the p-air inelastic cross-section. We discuss the consistency of the mass composition measurements done by the Fly’s Eye, the HiRes prototype/MIA and the HiRes stereo experiments. We introduce the first cross-section measurement at 1018:5 eV done using the HiRes stereo data and a newly developed deconvolution technique. The atmosphere can introduce a significant bias into these measurements. We estimate the systematic errors comparing the HiRes standard atmospheric model with the balloon data from the Salt Lake international airport.
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