Observation of a very energetic cosmic ray well beyond the predicted 2.7-K cutoff in the primary energy spectrum

Aug, 1994
13 pages
Published in:
  • Phys.Rev.Lett. 73 (1994) 3491-3494
Report number:
  • ICRR-324-94-19
Experiments:

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Abstract: (APS)
A very energetic cosmic ray of energy about (1.7-2.6) × 1020 eV was observed by the Akeno Giant Air Shower Array on 3 December 1993 from the direction of galactic longitude l=131° and galactic latitude b=−41° within an error circle of 1.0° radius. If this cosmic ray were a proton; its origin could be extragalactic. However, the distance of the source cannot be much more than a few times 10 Mpc due to the energy loss during its travel from interactions with universal background radiation.
  • cosmic radiation: energy spectrum
  • energy spectrum: cosmic radiation
  • cosmic radiation: primary
  • charged particle: cosmic radiation
  • cosmic radiation: time dependence
  • cosmic radiation: angular distribution
  • angular distribution: cosmic radiation
  • shower detector: experimental results