Observation of seasonal variation of atmospheric multiple-muon events in the NOvA Near Detector
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2019
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Using two years of data from the NOvA Near Detector at Fermilab, we report a seasonal variation of
cosmic ray induced multiple-muon (Nμ ≥ 2) event rates which has an opposite phase to the seasonal
variation in the atmospheric temperature. The strength of the seasonal multiple-muon variation is shown to
increase as a function of the muon multiplicity. However, no significant dependence of the strength of the
seasonal variation of the multiple-muon variation is seen as a function of the muon zenith angle, or the
spatial or angular separation between the correlated muons.
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ACERO, M. A. et al. Observation of seasonal variation of atmospheric multiple-muon events in the NOvA Near Detector. Physical Review D, Washington, v. 99, n. 12, e122004, 2019. DOI: 10.1103/PhysRevD.99.122004. Disponível em: https://journals.aps.org/prd/pdf/10.1103/PhysRevD.99.122004. Acesso em: 16 maio 2023.