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  • multiseason

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  • PhysRevD.91.112006

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Observation of seasonal variation of atmospheric multiple-muon events in the MINOS near and far detectors

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  • MINOS Collaboration
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Article number112006
<mark>Journal publication date</mark>9/06/2015
<mark>Journal</mark>Physical Review D
Volume91
Number of pages9
Publication StatusPublished
<mark>Original language</mark>English

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.