Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009oaj.....2...95w&link_type=abstract
The Open Astronomy Journal, vol. 2, issue 1, pp. 95-101
Astronomy and Astrophysics
Astronomy
3
Composition, Energy Spectra And Interactions, Extensive Air Showers, Cosmic Rays
Scientific paper
A recent observation by the Auger Observatory group presents evidence for cosmic rays above 5.6x10^19 eV -(56 EeV) being "predominantly protons" coming from Active Galactic Nuclei. If, as would be expected, the particles above the ankle at about 2 EeV are almost all of Extragalactic origin then it follows that the characteristics of the nuclear interactions of such particles would need to be very different from conventional expectation ? a result that follows from the measured positions of "shower maximum" at somewhat lower energies where mass measurements using conventional nuclear interaction models indicate (ln A) 2.5. Such a claim is rather dramatic.
In our own analysis we study to what extent the Auger results could, indeed, give such a mean value for (ln A)rather than a much smaller one. We conclude that they can, and the need for a dramatic change in the nuclear physics disappears.
Wibig Tadeusz
Wolfendale Arnold W.
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