Abstract
The analysis of an extremely energetic air shower produced by a primary cosmic ray particle of energy ⩾ 5×1019 eV is described. The flux of particles of this energy is shown to be greater than expected under certain assumptions concerning universal black body radiation and the location of cosmic ray sources. The observation also provides some evidence that the primary particles in this energy region are protons.
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ANDREWS, D., EVANS, A., REID, R. et al. Evidence for the Existence of Cosmic Ray Particles with Energy ⩾ 5×1019 eV. Nature 219, 343–346 (1968). https://doi.org/10.1038/219343a0
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DOI: https://doi.org/10.1038/219343a0
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