Telescope Array extension

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• 作者：Hiroyuki Sagawa ; for the Telescope Array Collaboration
• 关键词：Ultra-High-Energy Cosmic Rays ; Telescope Array (TA) ; Hotspot ; TAx4 ; TALE
• 刊名：Nuclear and Particle Physics Proceedings
• 出版年：2016
• 出版时间：October-December 2016
• 年：2016
• 卷：279-281
• 期：Complete
• 页码：145-152
• 全文大小：2118 K

文摘

The Telescope Array (TA) consists of an array of surface detectors (SD) covering 700 km² in area and three fluorescence detector (FD) stations and explores the origin of ultra-high-energy cosmic rays. We found evidence for a cosmic-ray hotspot, which is the sky area of emitting more highest-energy cosmic rays than other area. To confirm what the origin of the hotspot is, we proposed the TAx4, which would quadruple the TA. From around 10^15.5 eV to 10¹⁸ eV, we expect the transition from galactic cosmic rays to extra-galactic cosmic rays. The TALE (TA Low-Energy extension) FD has been fully operational and the TALE SDs have been operating partially. We confirmed two breaks at 10^16.3 eV and 10^17.3 eV in the energy spectrum measured with the TALE FD, and we proposed to construct remaining TALE SDs to improve the resolution of the shower maximum depth (X_max) measured with the TALE FD for composition identification. Both five-year proposals for TAx4 SD and TALE SD were funded independently in the spring of 2015. Here we present the status of these projects including NICHE (Non-Imaging CHErenkov detector array) that aims at energy extension down to 10¹⁵ eV (Knee region).