PoS - Proceedings of Science
Volume 444 - 38th International Cosmic Ray Conference (ICRC2023) - Cosmic-Ray Physics (Indirect, CRI)
Measurement depth of shower maximum for cosmic rays by LHAASO-WFCTA
L.Β Ma and L.Β Wang*
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Pre-published on: July 25, 2023
Published on: β€”
According to the superposition model, the air depth at which the shower size reaches its maximum
( π‘‹π‘šπ‘Žπ‘₯ ) is sensitive to the mass compositions of cosmic rays, so π‘‹π‘šπ‘Žπ‘₯ can be used to identify
the mass compositions and measure the average mean logarithm mass of cosmic rays. The Wide
Field of view Cherenkov Telescope Array ( WFCTA ) as an important part of Large High Altitude
Air Shower Observatory can record the Cherenkov images which can be used to reconstruct
π‘‹π‘šπ‘Žπ‘₯. The angular distance ( 𝐷𝑖𝑠𝑑 ) between the arriving direction and the gravity center of
the Cherenkov image is related to π‘‹π‘šπ‘Žπ‘₯. In this work, the method of the π‘‹π‘šπ‘Žπ‘₯ reconstruction
is studied by simulation data, and 20𝑔/π‘π‘š2 resolution of π‘‹π‘šπ‘Žπ‘₯ can be achieved. The ability
of the reconstructed π‘‹π‘šπ‘Žπ‘₯ in mass composition identification and the measurement of the mean
logarithm mass is also studied.
DOI: https://doi.org/10.22323/1.444.0407
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