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

Devenish, N E, Falk, E, Hartnell, J and The MINOS Collaboration, et al (2015) Observation of seasonal variation of atmospheric multiple-muon events in the MINOS Near and Far Detectors. Physical Review D, 91 (11). ISSN 2470-0010

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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.

Item Type: Article
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Subjects: Q Science > QC Physics
Depositing User: Billy Wichaidit
Date Deposited: 08 Sep 2017 09:38
Last Modified: 08 Sep 2017 10:24
URI: http://sro.sussex.ac.uk/id/eprint/70065

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