Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-08-12
Astronomy and Astrophysics
Astrophysics
8 pages, 11 figures, proceedings of XXth Rencontres de Blois
Scientific paper
The construction of the southern site of the Pierre Auger Observatory is almost completed. Three independent measurements of the flux of the cosmic rays with energies larger than 1 EeV have been performed during the construction phase. The surface detector data collected until August 2007 have been used to establish a flux suppression at the highest energies with a 6 sigma significance. The observations of cosmic rays by the fluorescence detector allowed the extension of the energy spectrum to lower energies, where the efficiency of the surface detector is less than 100% and a change in the spectral index is expected.
for the Pierre Auger Collaboration
Maris Ioana C.
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