Observation of muon intensity variations by season with the MINOS Near Detector

Adamson, P. and Anghel, I. and Aurisano, A. and Barr, G. and Bishai, M. and Blake, A. and J. Bock, G. and Bogert, D. and V. Cao, S. and M. Castromonte, C. and Childress, S. and A. B. Coelho, J. and Corwin, L. and Cronin-Hennessy, D. and K. de Jong, J. and V. Devan, A. and E. Devenish, N. and V. Diwan, M. and O. Escobar, C. and J. Evans, J. and Falk, E. and J. Feldman, G. and H. Fields, T. and V. Frohne, M. and R. Gallagher, H. and A. Gomes, R. and C. Goodman, M. and Gouffon, P. and Graf, N. and Gran, R. and Grzelak, K. and Habig, A. and R. Hahn, S. and Hartnell, J. and Hatcher, R. and Holin, A. and Huang, J. and Hylen, J. and M. Irwin, G. and Isvan, Z. and James, C. and Jensen, D. and Kafka, T. and M. S. Kasahara, S. and Koizumi, G. and Kordosky, M. and Kreymer, A. and Lang, K. and Ling, J. and A. Nowak, J. (2014) Observation of muon intensity variations by season with the MINOS Near Detector. arxiv.org.

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A sample of 1.53$\times$10$^{9}$ cosmic-ray-induced single muon events has been recorded at 225 meters-water-equivalent using the MINOS Near Detector. The underground muon rate is observed to be highly correlated with the effective atmospheric temperature. The coefficient $\alpha_{T}$, relating the change in the muon rate to the change in the vertical effective temperature, is determined to be 0.428$\pm$0.003(stat.)$\pm$0.059(syst.). An alternative description is provided by the weighted effective temperature, introduced to account for the differences in the temperature profile and muon flux as a function of zenith angle. Using the latter estimation of temperature, the coefficient is determined to be 0.352$\pm$0.003(stat.)$\pm$0.046(syst.).

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9 pages 10 figures
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18 Jun 2015 05:30
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12 Jul 2020 04:49