Measurement of the Cosmic-Ray Energy Spectrum and Composition from 1017 to 1018.3 eV Using a Hybrid Technique
By T. Abu-Zayyad, K. Belov, D. Bird, J. Boyer, Z. Cao, M. Catanese, G. Chen, R. Clay, C. Covault, H. Dai and 37 more. 2000
177 citations recorded by the source corpus.
We study the spectrum and average mass composition of cosmic rays with primary energies between 1017 and 1018 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 × 1017 eV.
Subfields: Nuclear and High Energy Physics
View Paper: https://www.semanticscholar.org/paper/3c6439676b67e8163368771328686809ce2cc072
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In Nuclear and High Energy Physics
Citations in the corpus
- A Study of the Composition of Ultra-High-Energy Cosmic Rays Using the High-Resolution Fly’s Eye (2002, background): “A similar break (the second knee) from index 3.0 to 3.3 has been reported near 1017.7 eV (Abu-Zayyad et al. 2001a; Bird et al. 1993, 1995; Pravdin et al. 1999; Glushkov et al. 2003; Nagano et al. 1984; Lawrence et al. 1991) and is followed by a rise to an index of 2.7 (the ankle) near 1018.6 eV.”