Cosmic rays of the highest energies: the case for extragalactic heavy nuclei

Details Cosmic rays of the highest energies: the case for extragalactic heavy nuclei Cosmic rays of the highest energies: the case for extragalactic heavy nuclei

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aph....17..125s&link_type=abstract

Astroparticle Physics, Volume 17, Issue 2, p. 125-131.

Physics

11

Scientific paper

An analysis has been made of the world's data on very large extensive air showers with the object of deriving a `best-fit' primary energy spectrum. It is reassuring that when the various, independently measured, spectra are standardised, using as a datum the well-known `dip' in the spectrum at about 3×1018 eV, and a correction for inferred `noise', the measurements are all consistent. The best-fit spectrum bears out the well-known problem with the lack of observation of a feature (a cut-off) due to interactions of the particles, commonly assumed to be extra-galactic protons, with the cosmic microwave background. However, we contend that a model involving extragalactic nuclei [J. Phys. A 8 (1975) 1518; Astrophys. J. 205 (1976) 638; Astrophys. J. 512 (1999) 521] is satisfactory, although it is premature to be too prescriptive, due to the shortage of astronomical data.

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