Abstract
The complicated form of the cosmic-ray spectrum recorded in the energy range 1017–1020 eV by giant detector arrays is analyzed. It is shown that the spectrum in the region 1018–1019 eV is apparently identical to the injection spectrum with power-law exponent approximately equal to 3.2–3.3. The flat component in the region (3.2–5)×1019 eV is due to the braking of extragalactic protons by relict photons. The spectrum apparently has no blackbody cutoff at energies above 3.2×1019 eV.
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Pis’ma Zh. Éksp. Teor. Fiz. 65, No. 10, 729–733 (25 May 1997)
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Uryson, A.V. Possible origin and spectrum of ultrahigh-energy cosmic rays. Jetp Lett. 65, 763–767 (1997). https://doi.org/10.1134/1.567423
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DOI: https://doi.org/10.1134/1.567423