Speaker
Description
The Telescope Array (TA) is the largest cosmic-ray observatory in the Northern Hemisphere. With the main goal of determining the origin of cosmic rays, it is designed to measure the properties of cosmic rays over a wide energy range. Together with its low-energy extension, TALE, TA observes cosmic-ray-induced extensive air showers from 2×10^15 to 2×10^20 eV in hybrid mode, employing a surface array of scintillator detectors (SD) and telescopes to measure the fluorescence and Cherenkov light. To increase statistics at the highest energies, the TAx4 expansion is currently under construction, which will quadruple the detector’s effective area. We present the current status of the TA, TAx4 and TALE experiments, along with the most recent physics results. Notable highlights include mass composition measurements in hybrid mode between 10^16.5 and 10^18.5 eV from TA and TALE, and ultra-high-energy photon flux limits obtained using novel machine learning techniques, correlations of ultra-high-energy cosmic rays with BL Lac type objects. The interdisciplinary results on Terrestrial Gamma-Ray Flashes observed at the TA SD will also be shown.
