Flux Modulations seen by the Muon Veto of the GERDA Experiment

Abstract

The GERDA experiment at LNGS of INFN is equipped with an active muon veto. The main part of the system is a water Cherenkov veto with 66~PMTs in the water tank surrounding the GERDA cryostat. The muon flux recorded by this veto shows a seasonal modulation. Two effects have been identified which are caused by secondary muons from the CNGS neutrino beam (2.2 %) and a temperature modulation of the atmosphere (1.4 %). A mean cosmic muon rate of $I_{\mu }^0=(3.477\pm 0.002_{\text{stat}}\pm 0.067_{\text{sys}})\times 10^{-4}$/(s$\cdot$m${}^2$) was found in good agreement with other experiments at LNGS at a depth of 3500~meter water equivalent.

arXiv comment7 pages, 6 figures

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• Measurement of the cosmic ray muon flux seasonal variation with the OPERA detector
• Middle-atmosphere dynamics observed with a portable muon detector
• Seasonal Variation of the Underground Cosmic Muon Flux Observed at Daya Bay
• An Optimal Energy Estimator to Reduce Correlated Noise for the EXO-200 Light Readout
• Atmospheric muons and their variations with temperature
• On the Mechanism of Temperature Variations in the Average Energy of Muons at Large Depths
• Seasonal variations of the rate of multiple-muons in the Gran Sasso underground laboratory