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 …

This review focuses on high-energy cosmic rays in the PeV energy range and above. Of
particular interest is the knee of the spectrum around 3 PeV and the transition from cosmic …

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 …

In this paper we review air shower data related to the mass composition of cosmic rays
above 1015eV. After explaining the basic relations between air shower observables and the …

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 …

Construction of the first stage of the Pierre Auger Observatory has begun. The aim of the
Observatory is to collect unprecedented information about cosmic rays above 10 18eV. The …

The knee in the all-particle energy spectrum is scrutinized with a phenomenological model,
named poly-gonato model, linking results from direct and indirect measurements. For this …

This review summarizes recent developments in the understanding of high-energy cosmic
rays. It focuses on galactic and presumably extragalactic particles in the energy range from …

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 Astrophysics and Space Science Library is a series of high-level monographs and
edited volumes covering a broad range of subjects in Astrophysics, Astronomy, Cosmology …