The origin and nature of ultrahigh-energy cosmic rays (UHECRs, E> 10 18 eV) is one of the
most intriguing unsolved problems of modern astrophysics. This review is dedicated to the …

For our understanding of the origin of ultra high energy cosmic rays, the energy region
between 10^ 17 and 10^ 19 eV is of crucial importance. Previous experiments have found …

The Pierre Auger Observatory (Auger)[1] and the Telescope Array Project (TA)[2] are the two
largest experiments in the world that study ultra-high-energy cosmic rays (UHECR). They …

The identification of the astrophysical objects able to accelerate ultra high-energy cosmic
rays (UHECRs) is a longstanding question in astrophysics. Patterns in the arrival direction …

We have published the energy spectrum of ultra-high energy cosmic rays (UHECRs) for E>
10^ 18.2 eV from our first 5-year observation with the surface detectors of Telescope Array …

Figure 1: Map of the Telescope Array experiment together with the extensions. The red
border line indicates the Telescope Array (TA), and the pink one represents the low energy …

We predict the arrival distribution of ultra–high-energy cosmic rays (UHECRs) above 4× 10
19 eV with the event number expected by future experiments in the next few years. We …

Telescope Array (TA) is the largest ultrahigh-energy cosmic-ray (UHECR) observatory in the
northern hemisphere. It explores the origin of UHECRs using a surface detector (SD) array …

The energy spectrum of ultra-high energy cosmic rays (UHECRs) provides essential
information on the most energetic phenomena in the Universe. Beyond EeV energies, the …

Ultrahigh-energy cosmic rays (UHECRs) are known to come from outside of our Galaxy, but
their origin still remains unknown. The Telescope Array (TA) experiment recently identified a …