12-20 July 2017
Asia/Seoul timezone
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BEXCO - Room F(201/202/203/204)

[GA324] Detection of vertical muons with the HAWC water Cherenkov detectors and it's application to gamma/hadron discrimination


  • Ruben ALFARO

Primary authors


The HAWC gamma ray observatory reconstructs atmospheric showers induced by very high energy primary cosmic- or gamma-rays. Cosmic rays are three 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 produce very characteristic signals in the 300 HAWC water Cherenkov detectors. In particular those events that produce signals in the four PMTs of one 7.3m 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 it is explored whether in large vertical showers it is possible to identify muon signals and whether this can help in the gamma/hadron discrimination of the recorded events.