739 citations · 1.9k across the 7 of their papers we have counts for
6 papers · 1 filter
Observation of the suppression of the flux of cosmic rays above 4x10^19eV
The Pierre Auger Collaboration
The energy spectrum of cosmic rays above 2.5x10^18eV, derived from 20,000 events recorded at the Pierre Auger Observatory, is described. The spectral index gamma of the flux, J ~ E…
Upper limit on the cosmic-ray photon flux above 10^19 eV using the surface detector of the Pierre Auger Observatory
The Pierre Auger Collaboration
A method is developed to search for air showers initiated by photons using data recorded by the surface detector of the Auger Observatory. The approach is based on observables sens…
First Observation of the Greisen-Zatsepin-Kuzmin Suppression
HiRes Collaboration
The High Resolution Fly's Eye (HiRes) experiment has observed the Greisen-Zatsepin-Kuzmin suppression (called the GZK cutoff) with a statistical significance of five standard devia…
Studies of systematic uncertainties in the estimation of the monocular aperture of the HiRes experiment
HiRes Collaboration
We have studied several sources of systematic uncertainty in calculating the aperture of the High Resolution Fly's Eye experiment (HiRes) in monocular mode, primarily as they affec…
An upper limit to the photon fraction in cosmic rays above 10^19 eV from the Pierre Auger Observatory
Pierre Auger Collaboration
An upper limit of 16% (at 95% c.l.) is derived for the photon fraction in cosmic rays with energies greater than 10^19 eV, based on observations of the depth of shower maximum perf…
Observation of the Ankle and Evidence for a High-Energy Break in the Cosmic Ray Spectrum
s Eye Collaboration
We have measured the cosmic ray spectrum at energies above eV using the two air fluorescence detectors of the High Resolution Fly's Eye experiment operating in monocular…