Evidence for correlated changes in the spectrum and composition of cosmic rays at extremely high-energies
19934 pages
Published in:
- Phys.Rev.Lett. 71 (1993) 3401-3404
Experiments:
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Abstract: (APS)
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.- cosmic radiation: energy spectrum
- energy spectrum: cosmic radiation
- cosmic radiation: anisotropy
- cosmic radiation: hadronic component
- experimental results
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