We present the first hybrid measurement of the average muon number in air showers at
ultrahigh energies, initiated by cosmic rays with zenith angles between 62° and 80°. The …

SEARCHES FOR ANISOTROPIES IN THE ARRIVAL DIRECTIONS OF THE HIGHEST
ENERGY COSMIC RAYS DETECTED BY THE PIERRE AUGER OBSERVATORY …

Neutrinos in the cosmic ray flux with energies near 1 EeV and above are detectable with the
Surface Detector array (SD) of the Pierre Auger Observatory. We report here on searches …

The sharp change in slope of the ultrahigh energy cosmic ray (UHECR) spectrum around 1
0 18.6 eV (the ankle), combined with evidence of a light but extragalactic component near …

The event generator Sibyll can be used for the simulation of hadronic multiparticle
production up to the highest cosmic ray energies. It is optimized for providing an economic …

We present a complete phenomenological model accounting for the evolution of the cosmic
ray spectrum and composition with energy, based on the available data over the entire …

The results of simulations of extragalactic propagation of ultra-high energy cosmic rays
(UHECRs) have intrinsic uncertainties due to poorly known physical quantities and …

We propose that ultra-high-energy (UHE) cosmic rays (CRs) above 10 18 eV are produced
in relativistic jets of powerful active galactic nuclei via an original mechanism, which we dub" …

Using recent measurements of the spectrum and chemical composition of the highest
energy cosmic rays, we consider the sources of these particles. We find that these data …

In this work we are reporting on the measurement of the proton-air inelastic cross section σ p-
air inel using the Telescope Array detector. Based on the measurement of the σ p-air inel …