Usage of the estimation of the height of the first interaction
July 22, 2019
The height of the first interaction of an Extensive Air Shower (EAS) is one of the parameters determining the shower development in the atmosphere. We derived a geometrical method of estimation of such a parameter. We study the influence of the first interaction height on the gamma/hadron separation efficiency. Using Monte Carlo simulations of a subarray of 4 Large Size Telescopes (LST) of the Cherenkov Telescope Array we find that one of the methods of the estimation of the height of the first interaction brings a mild improvement (∼10-20%) in the sensitivity at the lowest energies (30-200 GeV). We test also the method on the MC simulations and data of currently operating MAGIC telescopes.
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