Origin of Ultra High Energy Cosmic Rays

Details Origin of Ultra High Energy Cosmic Rays Origin of Ultra High Energy Cosmic Rays

Jan 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996plas.work..187t&link_type=abstract

Proceedings of the Fourth Brazilian Meeting on Plasma Physics and the Sixth Brazilian Plasma Astrophysics Workshop, p. 187

Astronomy and Astrophysics

Astrophysics

Cosmic Rays, Photons, Protons, Interstellar Extinction, Alpha Particles, Electron Acceleration, Gamma Rays, X Rays, Stellar Radiation, Energy Spectra, Astrophysics, Gamma Ray Astronomy, X Ray Binaries, Nuclear Particles

Scientific paper

The recent detection of several Ultra-High-Energy cosmic rays (UHECR) beyond 100 EeV (1 EeV = 1018 eV) poses a challenge for the understanding of their sources. The extreme energies are difficult to obtain by any astrophysical source. Because of photomeson production due to interactions with the CMBR photons, protons loose substantial amounts of energy Delta E/E approximately equals 10-20% along their path to the Earth, leading to a theoretical cutoff of the primary spectrum at Emax approximately equals 5 x 1019 eV (Greisen-Zatsepin-Kuzmin or GZK cutoff). A detailed calculation is thus needed to understand the propagation of UHE particles if we wish to pin up the sources.

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