Measurement of the cosmic ray energy spectrum above 10E18 eV using the Pierre Auger Observatory

THE PIERRE AUGER COLLABORATION (AUTOR 434 DE 474); M. TUEROS

Lodz, Polonia

Conferencia; 31st International Cosmic Ray Conference; 2009

The flux of cosmic rays above 10E18 eV has been measured with unprecedented precision using the Pierre Auger Observatory. Two analysis techniques have been used to extend the spectrumdownwards from 3 × 10E18 eV, with the lower energies being explored using a novel technique that exploits the hybrid strengths of the instrument.The systematic uncertainties, and in particular theinfluence of the energy resolution on the spectral shape, are addressed. The spectrum can be described by a broken power-law of index 3.3 below the ankle which is measured at lg(Eankle /eV) = 18.6.Above the ankle the spectrum is described by a power-law ∝ E −2.6 and a flux suppression with lg(E1/2 /eV) = 19.6.