Seasonal Variation of the Underground Cosmic Muon Flux Observed at Daya Bay

Abstract

The Daya Bay Experiment consists of eight identically designed detectors located in three underground experimental halls named as EH1, EH2, EH3, with 250, 265 and 860 meters of water equivalent vertical overburden, respectively. Cosmic muon events have been recorded over a two-year period. The underground muon rate is observed to be positively correlated with the effective atmospheric temperature and to follow a seasonal modulation pattern. The correlation coefficient $\alpha$, describing how a variation in the muon rate relates to a variation in the effective atmospheric temperature, is found to be ${\alpha }_{\text{EH1}}=0.362\pm 0.031$, ${\alpha }_{\text{EH2}}=0.433\pm 0.038$ and ${\alpha }_{\text{EH3}}=0.641\pm 0.057$ for each experimental hall.

Updated to be identical to the published version

References in corpus (5)

• Improved Measurement of Electron Antineutrino Disappearance at Daya Bay
• Uncertainties in Atmospheric Neutrino Fluxes
• A side-by-side comparison of Daya Bay antineutrino detectors
• Muon simulation codes MUSIC and MUSUN for underground physics
• Observation of muon intensity variations by season with the MINOS Near Detector

Cited by in corpus (5)

• Characterization of the varying flux of atmospheric muons measured with the Large Volume Detector for 24 years
• Middle-atmosphere dynamics observed with a portable muon detector
• A proposed PKU-Muon experiment for muon tomography and dark matter search
• Seasonal Variation of Multiple-Muon Cosmic Ray Air Showers Observed in the NOvA Detector on the Surface
• Explanation of the seasonal variation of cosmic multiple muon events observed with the NOvA Near Detector