Journal
ASTROPARTICLE PHYSICS
Volume 32, Issue 1, Pages 53-60Publisher
ELSEVIER
DOI: 10.1016/j.astropartphys.2009.06.001
Keywords
Cosmic rays; Spectrum; GZK cut-off; Air fluorescence technique; Stereo reconstruction
Funding
- US NSF [PHY9321949, PHY-9322298, PHY-9904048, PHY-9974537, PHY0098826, PHY-0140688, PHY-0245428, PHY-0305516, PHY0307098]
- DOE [FG0392ER40732]
- Direct For Mathematical & Physical Scien
- Division Of Physics [0848320, 0758342] Funding Source: National Science Foundation
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The High Resolution Fly's Eye (HiRes) experiment has measured the flux of ultrahigh energy cosmic rays using the stereoscopic air fluorescence technique. The HiRes experiment consists of two detectors that observe cosmic ray showers via the fluorescence light they emit. HiRes data can be analyzed in monocular mode, where each detector is treated separately, or in stereoscopic mode where they are considered together. Using the monocular mode the HiRes collaboration measured the cosmic ray spectrum and made the first observation of the Greisen-Zatsepin-Kuzmin cutoff. In this paper we present the cosmic ray spectrum measured by the stereoscopic technique. Good agreement is found with the monocular spectrum in all details. (C) 2009 Elsevier B.V. All rights reserved.
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