Observation of a Very Energetic Cosmic Ray Well Beyond the Predicted 2.7 K Cutoff in the Primary Energy Spectrum
- 26 December 1994
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 73 (26) , 3491-3494
- https://doi.org/10.1103/physrevlett.73.3491
Abstract
A very energetic cosmic ray of energy about (1.7-2.6) × eV was observed by the Akeno Giant Air Shower Array on 3 December 1993 from the direction of galactic longitude and galactic latitude 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.
Keywords
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