K. Tsutsumi

TL;DR: In this paper, the authors search for intermediate-scale anisotropy in the arrival directions of ultra-high-energy cosmic rays with energies above 57 EeV in the northern sky using data collected over a 5-year period by the surface detector of the Telescope Array experiment.

TL;DR: The Telescope Array (TA) experiment as discussed by the authors was designed for the observation of extensive air showers from extremely high energy cosmic rays, and it has a surface detector array surrounded by three fluorescence detectors to enable simultaneous detection of shower particles at ground level and fluorescence photons along the shower track.

TL;DR: The Telescope Array experiment is supported by the Japan Society for the Promotion of Science through Grants-in-Aids for Scientific Research on Specially Promoted Research (21000002) "Extreme Phenomena in the Universe Explored by Highest Energy Cosmic Rays" and for scientific research (S) (19104006), and the Inter-University Research Program of the Institute for Cosmic Ray Research.

TL;DR: In this paper, the authors search for intermediate-scale anisotropy in the arrival directions of ultra-high-energy cosmic rays with energies above 57~EeV in the northern sky using data collected over a 5 year period by the surface detector of the Telescope Array experiment.

TL;DR: In this article, the characteristics and installation of the new FDs and the performances of the FD components are reported and the results of the monitored mirror reflectance during the observation time are also described.