Observation of muon intensity variations by season with the MINOS far detector
- 6 January 2010
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review D
- Vol. 81 (1), 012001
- https://doi.org/10.1103/physrevd.81.012001
Abstract
The temperature of the upper atmosphere affects the height of primary cosmic ray interactions and the production of high-energy cosmic ray muons which can be detected deep underground. The MINOS far detector at Soudan, MN, has collected over cosmic ray induced muons. The underground muon rate measured over a period of five years exhibits a 4% peak-to-peak seasonal variation which is highly correlated with the temperature in the upper atmosphere. The coefficient, , relating changes in the muon rate to changes in atmospheric temperature was found to be . Pions and kaons in the primary hadronic interactions of cosmic rays in the atmosphere contribute differently to due to the different masses and lifetimes. This allows the measured value of to be interpreted as a measurement of the ratio for of , consistent with the expectation from collider experiments.
Other Versions
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