Cerenkov Events Seen by The TALE Air Fluorescence Detector
Tareq Abu-Zayyad, Telescope-Array Collaboration

TL;DR
This paper explores the detection and reconstruction of Cerenkov light events using the TALE air fluorescence detector, aiming to extend cosmic ray observation capabilities below 10^16 eV with promising initial results.
Contribution
It demonstrates the potential of using TALE as an imaging Cerenkov detector, achieving accurate geometrical reconstruction and improved energy resolution at low energies.
Findings
Pointing accuracy of about 1 degree for Cerenkov events
Energy resolution better than 25% for reconstructed events
Potential to extend detection threshold below 10^16 eV
Abstract
The Telescope Array Low-Energy Extension (TALE) is a hybrid, Air Fluorescence Detector (FD) / Scintillator Array, designed to study cosmic ray initiated showers at energies above eV. Located in the western Utah desert, the TALE FD is comprised of 10 telescopes which cover the elevation range 31-58 in addition to 14 telescopes with elevation coverage of 3-31. As with all other FD's, a subset of the shower events recorded by TALE are ones for which the Cerenkov light produced by the shower particles dominates the total observed light signal. In fact, for the telescopes with higher elevation coverage, low energy Cerenkov events form the vast majority of triggered cosmic ray events. In the typical FD data analysis procedure, this subset of events is discarded and only events for which the majority of signal photons come from air fluorescence are…
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Taxonomy
TopicsAstrophysics and Cosmic Phenomena · Dark Matter and Cosmic Phenomena · Radiation Therapy and Dosimetry
