Observation of the ankle and evidence for a high-energy break in the cosmic ray spectrum

2005/01/31 by s Eye Collaboration, R.U. Abbasi, T. Abu‐Zayyad +55 · 3 citations
Physics and Astronomy · #Astrophysics and Cosmic Phenomena #Dark Matter and Cosmic Phenomena #Neutrino Physics Research #astro-ph

paper · pdf · doi:10.1016/j.physletb.2005.05.064

published as Phys.Lett.B619:271-280,2005 · 14 pages, 9 figures. To appear in Physics Letters B. Accepted version

arxiv created 2005/06/07 · openalex publication_date 2005/06/10 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/01

Abstract

We have measured the cosmic ray spectrum at energies above 1017eV 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 3×1018eV, and strong evidence for a suppression near 6×1019eV.

Citations

• A Study of the Composition of Ultra–High‐Energy Cosmic Rays Using the High‐Resolution Fly’s Eye

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