Journal
PHYSICS LETTERS B
Volume 619, Issue 3-4, Pages 271-280Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physletb.2005.05.064
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We have measured the cosmic ray spectrum at energies above 10(17) eV using the two air fluorescence detectors of the High Resolution Fly's Eye experiment operating in monocular mode. We describe the detector, PMT and atmospheric calibrations, and the analysis techniques for the two detectors. We fit the spectrum to models describing galactic and extragalactic sources. Our measured spectrum gives an observation of a feature known as the ankle near 3 x 10(18) eV, and strong evidence for a suppression near 6 x 10(19) eV. (c) 2005 Elsevier B.V. All rights reserved.
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