Speaker
Description
Cosmic-ray chemical composition measurements are important for elucidating the origin of cosmic rays within the galaxy. The iron cosmic-ray spectrum in the TeV band is not yet well-characterized because of large statistical uncertainties, necessitating high-precision measurements in this energy range. TeV iron cosmic-rays can be observed with imaging atmospheric Cherenkov telescope by detecting the Cherenkov light they induce before they start an extensive shower. Since the Large-Sized telescopes (LSTs) of the Cherenkov Telescope Array Observatory are constructed using a larger mirror than in previous studies, it is anticipated to possess high energy and charge resolution, and is expected to demonstrate excellent background removal capabilities. Furthermore, for the same reason, it is expected to enable observations at higher zenith angles, resulting in an increase in effective observation time. For these reasons, LSTs are expected to provide a higher sensitivity as compared to previous studies. We report on the evaluation of the charge reconstruction performance of iron events using Monte Carlo simulations of the array of LSTs, and present the observational conditions under which iron nuclei can be detected. We also report on direct Cherenkov event candidates identified through the analysis of LST-1 real data.
