Ultrahigh energy cosmic ray air showers probe particle physics at energies beyond the
reach of accelerators. Here we introduce a new method to test hadronic interaction models …

The Pierre Auger Observatory has begun a major Upgrade of its already impressive
capabilities, with an emphasis on improved mass composition determination using the …

We report a first measurement for ultrahigh energy cosmic rays of the correlation between
the depth of shower maximum and the signal in the water Cherenkov stations of air-showers …

The origin and composition of ultra-high-energy cosmic rays (UHECRs) remain a mystery.
The proton dip model describes their spectral shape in the energy range above 10 9 GeV by …

Abstract The Telescope Array (TA) experiment is the largest detector to observe ultra-high-
energy cosmic rays in the northern hemisphere. The fluorescence detectors at two stations …

The first flight of the Antarctic Impulsive Transient Antenna (ANITA) experiment recorded 16
radio signals that were emitted by cosmic-ray induced air showers. The dominant …

The recent detection of the gravitational-wave source GW150914 by the LIGO collaboration
motivates a speculative source for the origin of ultrahigh-energy cosmic rays as a possible …

For 50 years, cosmic-ray air showers have been detected by their radio emission. We
present the first laboratory measurements that validate electrodynamics simulations used in …

We investigate two recent parameterizations of the galactic magnetic field with respect to
their impact on cosmic nuclei traversing the field. We present a comprehensive study of the …

The azimuthal asymmetry in the risetime of signals in Auger surface detector stations is a
source of information on shower development. The azimuthal asymmetry is due to a …