# Ultrahigh energy cosmic rays

@article{LetessierSelvon2011UltrahighEC,
title={Ultrahigh energy cosmic rays},
author={Antoine Letessier-Selvon and Todor Stanev},
journal={Reviews of Modern Physics},
year={2011},
volume={83},
pages={907-942}
}
• Published 2011
• Physics
• Reviews of Modern Physics
This is a review of the most resent results from the investigation of the ultrahigh energy cosmic rays, particles of energy exceeding ${10}^{18}\text{ }\text{ }\mathrm{eV}$. 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 and the Southern Auger Observatory, are described. Results from these two experiments on the cosmic ray energy spectrum, the chemical… Expand
116 Citations
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#### References

SHOWING 1-10 OF 199 REFERENCES
The Highest-Energy Cosmic Rays
• Physics
• 2009
The search for the origin of cosmic rays with energies above 1018 eV has made considerable progress during the past few years. With new data from the High Resolution Fly's Eye experiment in Utah andExpand
Observations and implications of the ultrahigh-energy cosmic rays
• Physics
• 2000
cosmic rays around 6310 19 eV induced by the interaction of the particles with the 2.7-K primordial photons. However, recent experimental data have established that particles exist with energiesExpand
Evidence for correlated changes in the spectrum and composition of cosmic rays at extremely high energies.
• Bird, +18 authors Tilav
• Physics, Medicine
• Physical review letters
• 1993
The Utah Fly's Eye detector has revealed a change in the cosmic ray composition which is correlated with structure in the all-particle energy spectrum, implying that the highest energy particles originate in the contemporary era of the Universe. Expand
Ultra high energy cosmic rays
Abstract The current status of Ultra High Energy Cosmic Rays (UHECR) is reviewed, with emphasis given to elementary particle solutions to UHECR problem, namely to Topological Defects and Super-HeavyExpand
Correlation of the highest energy cosmic rays with nearby extragalactic objects
Using data collected at the Pierre Auger Observatory during the past 3.7 years, we demonstrate that there is a correlation between the arrival directions of cosmic rays with energy above {approx} 6 xExpand
Extension of the Cosmic-Ray Energy Spectrum Beyond the Predicted Greisen-Zatsepin-Kuz'min Cutoff
The cosmic-ray energy spectrum above 10^{18.5} eV is reported using the updated data set of the Akeno Giant Air Shower Array (AGASA) from February 1990 to October 1997. The energy spectrum extendsExpand
Arrival directions of the most energetic cosmic rays.
• Physics, Medicine
• Physical review letters
• 1995
The arrival directions of the most energetic cosmic rays detected by several air shower experiments are examined, finding that data taken by different air shower arrays show positive correlations, indicating a nonuniform arrival direction distribution. Expand
The prototype high-resolution Fly's Eye cosmic ray detector
Abstract The High-Resolution Fly's Eye (HiRes) is an observatory for the highest energy cosmic rays. It detects the nitrogen fluorescence light induced by the passage of giant cosmic ray extensiveExpand
The intergalactic propagation of ultrahigh energy cosmic ray nuclei
• Physics
• 2007
We investigate the propagation of ultra-high energy cosmic ray nuclei (A = 1-56) from cosmologically distant sources through the cosmic radiation backgrounds. Various models for the injectedExpand
Origin and propagation of extremely high-energy cosmic rays
• Physics
• 1998
Abstract Cosmic-ray particles with energies in excess of 10 20  eV have been detected. The sources as well as the physical mechanism(s) responsible for endowing cosmic-ray particles with suchExpand