The Energy Spectrum of Cosmic Ray Proton and Helium above 100TeV Measured by LHAASO Experiment
July 07, 2021
Large High Altitude Air Shower Observatory (LHAASO) consists of three interconnected detectors
with the aim to measure several air shower characteristics simultaneously. One of the main
scientific goals is to measure the individual cosmic ray spectrum at knee regime. In this paper
we introduce the progress of measuring the energy spectrum of proton and helium composition of
cosmic rays. According to the number of Cherenkov photons recorded by WFCTA, the energies
can be reconstructed and the resolution can achieve 15% for showers produced by protons and
helium with energies above 300 TeV. Due to the hybrid observation to the air showers, several
parameters can be used to identify the mass compositions of the air shower. The ability of
LHAASO to identify the mass composition are studied in detail in the paper.
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