Energy and Xmax reconstruction of hadron-initiated showers in surface arrays

Details Energy and Xmax reconstruction of hadron-initiated showers in surface arrays Energy and Xmax reconstruction of hadron-initiated showers in surface arrays

2011-10-06

arxiv.org/abs/1110.1179v1

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

4 pages, 7 figures. Presented in the 32nd International Cosmic Ray Conference, Beijing 2011

Scientific paper

The current methods to determine the primary energy in surface arrays are different when dealing with hadron or photon initiated showers. In this work, we adapt a method previously developed for photon-initiated showers to hadron primaries. We determine the Monte Carlo parametrizations that relate the surface energy estimator and the maximum of shower development for both, proton and Iron primaries. Using for each primary their own set of calibration curves, which is of course impossible in practice, we show that the energy could be inferred with a negligible bias and 12% resolution. However, we show that a mixed calibration could also be performed, including both type of primaries, such that the bias still remains low and the achieved resolution is around 15%. In addition, the method allows the simultaneous determination of Xmax in pure surface arrays with resolution better than 7%.

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