PoS - Proceedings of Science
Volume 301 - 35th International Cosmic Ray Conference (ICRC2017) - Session Gamma-Ray Astronomy. GA-instrumentation
Detection of vertical muons with the HAWC water Cherenkov detectors and it's application to gamma/hadron discrimination
A. Sandoval,* R. Alfaro, L. Alberto Hernández, E. Belmont, H. Leon Vargas, A. Zúñiga, A. Miranda, A.P. Vizcaya, J. Martínez on behalf of the HAWC Collaboration
*corresponding author
Full text: pdf
Pre-published on: August 16, 2017
Published on: August 03, 2018
Abstract
The HAWC observatory reconstructs atmospheric showers induced by very high-energy primary
cosmic- or gamma-rays. Cosmic rays are several orders of magnitude more frequent than primary
gammas and therefore it is necessary to perform the best gamma-hadron discrimination for each
event to be able to survey the gamma-ray sky. Single vertical muons cause very characteristic
signals in the 300 HAWC water Cherenkov detectors. In particular, those events that produce
signals in the four PMTs of one 7.3 m diameter, 4.5 m high tanks corresponding to muons traversing
the tank in the central region. These events have a correlation that the largest signal is also the
earliest to arrive due to the geometry of the Cherenkov light emission and the fact that relativistic
muons travel faster than the light in the medium. This pattern is different from that of electrons,
positrons and low energy gammas showering in the first meter of water typical of electromagnetic
showers. In this work, we explored whether in air-showers it is possible to identify muon signals
and whether this can help in the gamma/hadron discrimination of the recorded events.
DOI: https://doi.org/10.22323/1.301.0750
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