Evidence for correlated changes in the spectrum and composition of cosmic rays at extremely high energies

Details Evidence for correlated changes in the spectrum and composition of cosmic rays at extremely high energies Evidence for correlated changes in the spectrum and composition of cosmic rays at extremely high energies

Nov 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993phrvl..71.3401b&link_type=abstract

Physical Review Letters, Volume 71, Issue 21, November 22, 1993, pp.3401-3404

Physics

405

Cosmic Rays

Scientific paper

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 of protons. The transition occurs near 1018.5 eV. Anisotropy is not detected, so the high-rigidity particles above the transition energy do not originate in the disk of the Galaxy. An outstanding event of 3×1020 eV implies that the highest energy particles originate in the contemporary era of the Universe.

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