Energy measurement and spectrum by the Telescope Array

Details Energy measurement and spectrum by the Telescope Array Energy measurement and spectrum by the Telescope Array

Sep 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aipc.1367...54i&link_type=abstract

INTERNATIONAL SYMPOSIUM ON THE RECENT PROGRESS OF ULTRA-HIGH ENERGY COSMIC RAY OBSERVATION. AIP Conference Proceedings, Volume

Other

Cosmic Ray Apparatus, Calorimeters, Simulation, Data Analysis, Neutrino, Muon, Pion, And Other Elementary Particle Detectors, Cosmic Ray Detectors, Calorimeters, Numerical Simulation, Solution Of Equations, Data Analysis: Algorithms And Implementation, Data Management

Scientific paper

The Telescope Array experiment is the largest hybrid detector to observe ultra-high energy cosmic rays in the northern hemisphere. The observation started in November 2007 for Fluorescence Detector (FD) and in March 2008 for Surface Detectors (SD). The hybrid events which are detected both by SD and FD have good performance not only to compare the reconstructed energy scales between SD and FD but also to measure the energy spectrum. Here, we present the preliminary results of the energy spectrum with energies above 1018.7 eV measured by hybrid events from TA 1.5-year observation. To carry out this study, the method of the hybrid analysis, in which the timing of SD data is applied to FD monocular reconstruction, is developed. The angular resolution is less than 1.1 degrees and the energy resolution is less than 8% above 1018.7 eV. The systematic uncertainty to determine the energy is estimated to be 19%. The main contributions are the detector calibration (10%), atmospheric correction (11%) and fluorescence yield (12%). The obtained energy spectrum is consistent with the result of HiRes within the systematic uncertainty.

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