Friday, July 18, 2014

Indications of Intermediate-Scale Anisotropy of Cosmic Rays with Energy Greater Than 57 EeV in the Northern Sky Measured with the Surface Detector of the Telescope Array Experiment

The Telescope Array is the largest cosmic-ray detector in the northern hemisphere. It
consists of a scintillator surface detector (SD) array (Abu-Zayyad et al. 2012a) and three
fluorescence detector (FD) stations (Tokuno et al. 2012). The observatory has been in full
operation in Millard Country, Utah, USA (39. ◦ 30N, 112. ◦ 91W; about 1,400 m above sea level)
since 2008. The TA SD array consists of 507 plastic scintillation detectors each 3 m 2 in
area and located on a 1.2 km square grid. The array has an area of ∼700 km 2 . The TA
SD array observes cosmic ray induced extensive air showers with E >∼1 EeV, regardless
of weather conditions with a duty cycle near 100% and a wide field of view (FoV). These
capabilities ensure a very stable and large geometrical exposure over the northern sky survey
in comparison with FD observations that have a duty cycle of ∼10%.

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