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Bird, D.J., et al. (1993) Evidence for Correlated Changes in the Spectrum and Composition of Cosmic Rays at extremely High Energy. Phys. Rev. Letters, 71.

has been cited by the following article:

• TITLE: About the Energy Interval beyond the Ankle Where the Cosmic Radiation Consists Only of Ultraheavy Nuclei from Zinc to the Actinides

  AUTHORS: Antonio Codino

  KEYWORDS: Ultrahigh Energy Cosmic Ray, Chemical Composition, GZK Effect

  JOURNAL NAME: Journal of Applied Mathematics and Physics, Vol.5 No.1, January 31, 2017

  ABSTRACT: According to recent measurements the tendency of the chemical composition above the ankle is characterized by increasing fractions of intermediate and heavy nuclei and a dominance of light nuclei around the ankle. Calculation of the chemical composition in the range 3.5 × 1018 - 5 × 1019 eV according to new principles explains both the rising tendency of the heavy component. The calculation is prolonged to the adjacent interval 5 × 1019- 2.4 × 1021 eV using the same theoretical background and some features of the observed cosmic-ray spectrum. It results that above the energy of 6.7 × 1020 eV, where the flux is estimated to be 1.8 × 10?30 particles/m2 s sr GeV, the cosmic radiation consists only of nuclei heavier than Zinc. Measurements of the spectrum of present and past experiments are compared with the calculations.