PT Journal
AU Pierre Auger Collaboration (Abraham, Jea
   Pastor, S
TI Measurement of the energy spectrum of cosmic rays above 10(18) eV using the Pierre Auger Observatory
SO Physics Letters B
JI Phys. Lett. B
PY 2010
BP 239
EP 246
VL 685
IS 4-5
DI 10.1016/j.physletb.2010.02.013
LA English
DE Pierre Auger Observatory; Cosmic rays; Energy spectrum
AB We report a measurement of the flux of cosmic rays with unprecedented precision and Statistics using the Pierre Auger Observatory Based on fluorescence observations in coincidence with at least one Surface detector we derive a spectrum for energies above 10(18) eV We also update the previously published energy spectrum obtained with the surface detector array The two spectra are combined addressing the systematic uncertainties and, in particular. the influence of the energy resolution on the spectral shape The spectrum can be described by a broken power law E-gamma with index gamma = 3 3 below the ankle which is measured at log(10)(E-ankle/eV) = 18 6 Above the ankle the spectrum is described by a power law with index 2 6 followed by a flux suppression, above about log(10)(E/eV) = 19 5, detected with high statistical significance.
ER