Intergalactic propagation of heavy nuclei-are they the trans-greisen events?

Details Intergalactic propagation of heavy nuclei-are they the trans-greisen events? Intergalactic propagation of heavy nuclei-are they the trans-greisen events?

Jun 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aipc..433..212s&link_type=abstract

Workshop on observing giant cosmic ray air showers from >1020 eV particles from space. AIP Conference Proceedings, Volume 433, p

Physics

Cosmic Rays, Background Radiations, Elementary Particle Processes

Scientific paper

The critical interactions for energy loss and photodisintegration of ultra-high energy cosmic-ray (UHCR) nuclei occur with photons of the infrared background radiation (IBR). I present here the results of a new estimation of the photodisintegration and propagation of (UHCR) nuclei in intergalactic space. I have reexamined this problem making use of a new determination of the IBR based on empirical data, primarily from IRAS galaxies, and also collateral information from TeV γ-ray observations of two nearby BL Lac objects. The results of this new calculation indicate that a 200 EeV nucleus which started out as Fe can have propagated ~100 Mpc though the IBR. I argue that it is possible that the highest energy cosmic rays observed may be nuclei rather than protons.

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