Seasonal Variation of Multiple-Muon Cosmic Ray Air Showers Observed in the NOvA Detector on the Surface

Abstract

We report the rate of cosmic ray air showers with multiplicities exceeding 15 muon tracks recorded in the NOvA Far Detector between May 2016 and May 2018. The detector is located on the surface under an overburden of 3.6 meters water equivalent. We observe a seasonal dependence in the rate of multiple-muon showers, which varies in magnitude with multiplicity and zenith angle. During this period, the effective atmospheric temperature and surface pressure ranged between 210 K to 230 K and 940mbar to 990mbar, respectively; the shower rates are anti-correlated with the variation in the effective temperature. The variations are about 30% larger for the highest multiplicities than the lowest multiplicities and 20% larger for showers near the horizon than vertical showers.

References in corpus (9)

• First measurement of neutrino oscillation parameters using neutrinos and antineutrinos by NOvA
• The atmospheric charged kaon/pion ratio using seasonal variation methods
• Observation of muon intensity variations by season with the MINOS Near Detector
• Observation of seasonal variation of atmospheric multiple-muon events in the MINOS Near and Far Detectors
• Supernova neutrino detection in NOvA
• Measurement of the cosmic ray muon flux seasonal variation with the OPERA detector
• Observation of seasonal variation of atmospheric multiple-muon events in the NOvA Near Detector
• Seasonal Variation of the Underground Cosmic Muon Flux Observed at Daya Bay
• Atmospheric Dependence of the Stopping Cosmic Ray Muon Rate at Ground Level

Cited by in corpus (2)

• Identification and reconstruction of low-energy electrons in the ProtoDUNE-SP detector
• Explanation of the seasonal variation of cosmic multiple muon events observed with the NOvA Near Detector