High-energy cosmic rays are observed indirectly by detecting the extensive air showers
initiated in Earth's atmosphere. The interpretation of these observations relies on accurate …

We review open questions and prospects for progress in ultrahigh-energy cosmic ray
(UHECR) research, based on a series of discussions that took place during the “The High …

High energy collisions at the High-Luminosity Large Hadron Collider (LHC) produce a large
number of particles along the beam collision axis, outside of the acceptance of existing LHC …

Abstract The Probe Of Extreme Multi-Messenger Astrophysics (POEMMA) is designed to
accurately observe ultra-high-energy cosmic rays (UHECRs) and cosmic neutrinos from …

We have searched for intermediate-scale anisotropy in the arrival directions of ultrahigh-
energy cosmic rays with energies above 57 EeV in the northern sky using data collected …

Abstract The Pierre Auger Observatory, located on a vast, high plain in western Argentina, is
the world׳ s largest cosmic ray observatory. The objectives of the Observatory are to probe …

Cosmic rays are energetic charged particles from extraterrestrial sources, with the highest-
energy events thought to come from extragalactic sources. Their arrival is infrequent, so …

ABSTRACT The Telescope Array (TA) collaboration has measured the energy spectrum of
ultra-high energy cosmic rays (UHECRs) with primary energies above 1.6× 10 18 eV. This …

Abstract The Telescope Array (TA) observatory utilizes fluorescence detectors and surface
detectors (SDs) to observe air showers produced by ultra high energy cosmic rays in Earth's …

The mass composition of cosmic rays contains important clues about their origin. Accurate
measurements are needed to resolve longstanding issues such as the transition from …