Physics
Scientific paper
Feb 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006nwap.conf....3w&link_type=abstract
NEW WORLDS IN ASTROPARTICLE PHYSICS. Proceedings of the Fifth International Workshop. Held 8-10 January 2005 in Faro, Portugal.
Physics
Scientific paper
The present situation with regard to experimental data on ultra high-energy cosmic rays is briefly reviewed. Whilst detailed knowledge of the shape of the energy spectrum is still lacking, and there remains uncertainty as to whether there is a steepening of the spectrum near 1020 eV, it is likely that events above 1020 eV do exist. Evidence for clustering of the directions of some of the highest energy events now seems less certain than had once been claimed. Our knowledge of the mass composition of cosmic rays is deficient at all energies above 1018 eV and it must be improved if we are to discover the origin of the highest energy cosmic rays. Here it is argued, in particular, that there is no compelling evidence to support the common assumption that cosmic rays of the highest energies are protons. Clearly, more data are needed and these are likely to come from the southern branch of the Pierre Auger Observatory in the next few years. The Observatory is briefly described.
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