The Telescope Array (TA) is the largest hybrid cosmic ray detector in the Northern Hemisphere, which observes primary particles in the energy range from 2 PeV to 100 EeV. The main TA detector consists of 507 plastic scintillation counters on a 1.2-km spacing square grid and fluorescence detectors at three stations overlooking the sky above the surface detector array. The TA Low energy Extension (TALE) detector, which consists of ten fluorescence telescopes, and 80 infill surface detectors with 400m and 600 m spacing, has continued to provide stable observations since its construction completion in 2018. The TAx4, a plan to quadruple the detection area of TA is also ongoing. About half of the planned surface detectors have been deployed, and the current TAx4 continues to operate stably as a hybrid detector. I review the present status of the TA experiment and the recent results on the cosmic-ray anisotropy, mass composition and energy spectrum.
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- George S. and Dolores Dore Eccles Foundation
- 日本学術振興会 / Japan Society for the Promotion of Science [JSPS]
- Ministry of Science and Higher Education of the Russian Federation
- 名古屋大学 / Nagoya University
- National Research Foundation of Korea [NRF]
- National Science Foundation [NSF]
- State of Utah
- 東京大学 / University of Tokyo [UT]
- University of Utah
- Université Libre de Bruxelles
- Willard L. Eccles Charitable Foundation