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 | Kieda, David B.; Gaisser, Thomas K.; Sokolsky, Pierre | Evidence for correlated changes in the spectrum and composition of cosmic rays at extremely high energies | The Utah Fly's Eye detector has revealed a change in the cosmic ray composition which is correlated with structure in the all-particle energy spectrum. The data can be fitted by a simple model of a steep power law spectrum of heavy nuclei which is overtaken at high energies by a flatter spectrum o... | Ultrahigh energy cosmic rays; Fly's Eye; Cosmic ray composition; Cosmic ray spectrum | 1993-11 |