Abstract The Giant Radio Array for Neutrino Detection (GRAND) is a planned large-scale
observatory of ultra-high-energy (UHE) cosmic particles, with energies exceeding 10 8 GeV …

The present white paper is submitted as part of the “Snowmass” process to help inform the
long-term plans of the United States Department of Energy and the National Science …

Cosmic rays are observed up to the astounding energies of more than 1020 eV, making
them the most energetic particles known in the universe. However, the origin of these …

We present a new method for probing the hadronic interaction models at ultrahigh energy
and extracting details about mass composition. This is done using the time profiles of 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 world largest exposure to ultra-high energy cosmic rays accumulated by the Pierre
Auger Observatory led to major advances in our understanding of their properties, but the …

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 results on ultrahigh-energy cosmic rays (UHECR) mass composition obtained with the
Telescope Array surface detector are presented. The analysis employs the Boosted …

The existence of ultra-high energy cosmic rays (UHECRs) is one of the most intriguing
phenomena in astroparticle physics. UHECRs are atomic nuclei with energies above 1018 …

The energy spectrum of cosmic rays extends to beyond 100EeV. Where and how these
particles, predominantly the nuclei of the common elements up to iron, are accelerated is …