Online ISSN: 1884-4111 Print ISSN: 0033-8303
Radioisotopes 68(12): 843-856 (2019)

特集Special Issues

Telescope Arrayによる最高エネルギー宇宙線観測兆候の発見から精密観測へObservations of Ultra-high Energy Cosmic Rays with Telescope Array ExperimentFrom the Discoveries of Indications to Detailed Observations

1大阪市立大学大学院理学研究科Graduate school of science, Osaka City University ◇ 558–8585 大阪市住吉区杉本3–3–138 ◇ 3–3–138 Sugimoto, Sumiyoshi-ku, Osaka 558–8585, Japan

2大阪市立大学南部陽一郎物理学研究所Nambu Yoichiro Institute of Theoretical and Experimental Physics, Osaka City University ◇ 558–8585 大阪市住吉区杉本3–3–138 ◇ 3–3–138 Sugimoto, Sumiyoshi-ku, Osaka 558–8585, Japan

3東京大学宇宙線研究所Institute for Cosmic Ray Research, University of Tokyo ◇ 277–8582 千葉県柏市柏の葉5–1–5 ◇ 5–1–5 Kashiwanoha, Kashiwa-shi, Chiba 277–8582, Japan

発行日:2019年12月15日Published: December 15, 2019

Telescope Array(TA)実験は北半球最大の宇宙線観測装置で,1018 eVを超える最高エネルギー宇宙線観測を継続している。近年では,TALE実験の増設によって1016 eVまで観測しきい値を下げるとともに,現在建設中のTA×4実験によって3,000 km2まで検出面積を拡張する。ここでは,これらの装置を紹介するとともに,これまでの10年間の観測よって得られた最新の結果,特にエネルギースペクトル,宇宙線化学組成,到来方向異方性について報告する。

The Telescope Array (TA) is the largest cosmic-ray detector in the Northern Hemisphere, constructed to study ultra-high-energy cosmic rays (UHECRs) with energies above approximately 1018 eV. The TA has also added a facility (TALE) to extend the energy threshold down to approximately 1016 eV, and also we are currently expanding the effective detection area to 3,000 km2, which is called TA×4. The TA has accumulated a large UHECR data set which allows us to determine the energy spectrum and chemical composition of the primary particles, and search for anisotropy of UHECR arrival directions and thus sources of cosmic rays. We discuss the experiment and its most recent measurements - spectrum, composition, and anisotropy.

Key words: ultra-high energy cosmic ray; air shower; surface detector array; fluorescence detector; hybrid observation

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