Observation of seasonal variation of atmospheric multiple-muon events in the MINOS Near and Far Detectors

P. Adamson et al. (MINOS Collaboration)
Phys. Rev. D 91, 112006 – Published 9 June 2015

Abstract

We report the first observation of seasonal modulations in the rates of cosmic ray multiple-muon events at two underground sites, the MINOS Near Detector with an overburden of 225 mwe, and the MINOS Far Detector site at 2100 mwe. At the deeper site, multiple-muon events with muons separated by more than 8 m exhibit a seasonal rate that peaks during the summer, similar to that of single-muon events. In contrast and unexpectedly, the rate of multiple-muon events with muons separated by less than 5–8 m, and the rate of multiple-muon events in the smaller, shallower Near Detector, exhibit a seasonal rate modulation that peaks in the winter.

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  • Received 31 March 2015

DOI:https://doi.org/10.1103/PhysRevD.91.112006

© 2015 American Physical Society

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Vol. 91, Iss. 11 — 1 June 2015

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