# Ultrahigh Energy Cosmic Rays

Abstract : This is a review of the most resent results from the investigation of the Ultrahigh Energy Cosmic Rays, particles of energy exceeding 10$^{18}$ eV. After a general introduction to the topic and a brief review of the lower energy cosmic rays and the detection methods, the two most recent experiments, the High Resolution Fly's Eye (HiRes) and the Southern Auger Observatory are described. We then concentrate on the results from these two experiments on the cosmic ray energy spectrum, the chemical composition of these cosmic rays and on the searches for their sources. We conclude with a brief analysis of the controversies in these results and the projects in development and construction that can help solve the remaining problems with these particles.
Document type :
Journal articles
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http://hal.in2p3.fr/in2p3-00579869
Contributor : Swarna Bassava <>
Submitted on : Friday, March 25, 2011 - 1:51:28 PM
Last modification on : Friday, April 16, 2021 - 10:51:19 AM

### Citation

A. Letessier-Selvon, T. Stanev. Ultrahigh Energy Cosmic Rays. Reviews of Modern Physics, American Physical Society, 2011, 83, pp.907. ⟨10.1103/RevModPhys.83.907⟩. ⟨in2p3-00579869⟩

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