Detection of a Cosmic Ray with Measured Energy Well Beyond the Expected Spectral Cutoff due to Cosmic Microwave Radiation

@inproceedings{Al1994DetectionOA,
  title={Detection of a Cosmic Ray with Measured Energy Well Beyond the Expected Spectral Cutoff due to Cosmic Microwave Radiation},
  author={Dinu Al},
  year={1994}
}
  • D. Al
  • Published 20 October 1994
  • Physics
We report the detection of a 51-joule (3:2 (cid:6) 0:9 (cid:2) 10 20 eV) cosmic ray by the Fly's Eye air shower detector in Utah. This is substantially greater than the energy of any previously reported cosmic ray. A Greisen-Zatsepin-Kuz'min cuto(cid:11) of the energy spectrum (due to pion photoproduction energy losses) should occur below this energy unless the highest energy cosmic rays have traveled less than about 30 Mpc. The error box for the arrival direction in galactic coordinates is… 

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