Observation of muon intensity variations by season with the MINOS far detector

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 67×106 cosmic ray induced muons. The underground muon rate...

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Veröffentlicht in:	Physical review. D 2010-01, Vol.81 (1), Article 012001
Hauptverfasser:	Adamson, P., Andreopoulos, C., Arms, K. E., Armstrong, R., Auty, D. J., Ayres, D. S., Backhouse, C., Barnett, J., Barr, G., Barrett, W. L., Becker, B. R., Bishai, M., Blake, A., Bock, B., Bock, G. J., Boehnlein, D. J., Bogert, D., Bower, C., Cavanaugh, S., Chapman, J. D., Cherdack, D., Childress, S., Choudhary, B. C., Cobb, J. H., Coleman, S. J., Cronin-Hennessy, D., Culling, A. J., Danko, I. Z., de Jong, J. K., Devenish, N. E., Diwan, M. V., Dorman, M., Escobar, C. O., Evans, J. J., Falk, E., Feldman, G. J., Fields, T. H., Frohne, M. V., Gallagher, H. R., Godley, A., Goodman, M. C., Gouffon, P., Gran, R., Grashorn, E. W., Grzelak, K., Habig, A., Harris, D., Harris, P. G., Hartnell, J., Hatcher, R., Heller, K., Himmel, A., Holin, A., Hylen, J., Irwin, G. M., Isvan, Z., Jaffe, D. E., James, C., Jensen, D., Kafka, T., Kasahara, S. M. S., Koizumi, G., Kopp, S., Kordosky, M., Korman, K., Koskinen, D. J., Krahn, Z., Kreymer, A., Lang, K., Ling, J., Litchfield, P. J., Loiacono, L., Lucas, P., Ma, J., Mann, W. A., Marshak, M. L., Marshall, J. S., Mayer, N., McGowan, A. M., Mehdiyev, R., Meier, J. R., Messier, M. D., Metelko, C. J., Michael, D. G., Miller, W. H., Mishra, S. R., Mitchell, J., Moore, C. D., Morfín, J., Mualem, L., Mufson, S., Musser, J., Naples, D., Nelson, J. K., Newman, H. B., Nichol, R. J., Nicholls, T. C., Ochoa-Ricoux, J. P., Oliver, W. P., Osiecki, T.
Format:	Artikel
Sprache:	eng
Schlagworte:	AMBIENT TEMPERATURE Astrophysics ATMOSPHERES BOSONS CONCENTRATION RATIO COSMIC RADIATION DIMENSIONLESS NUMBERS ELEMENTARY PARTICLES ENERGY RANGE FERMIONS HADRONS High Energy Physics - Experiment Instrumentation and Methods for Astrophysic INTERACTIONS IONIZING RADIATIONS KAONS LEPTONS LEVELS LIFETIME MASS MESONS MUONS PEAKS Physics PHYSICS OF ELEMENTARY PARTICLES AND FIELDS PIONS PRIMARY COSMIC RADIATION PSEUDOSCALAR MESONS RADIATIONS Sciences of the Universe SEASONAL VARIATIONS STRANGE MESONS STRANGE PARTICLES TEV RANGE TEV RANGE 01-10 UNDERGROUND VARIATIONS
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Zusammenfassung:	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 67×106 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, αT, relating changes in the muon rate to changes in atmospheric temperature was found to be αT=0.873±0.009(stat)±0.010(syst). Pions and kaons in the primary hadronic interactions of cosmic rays in the atmosphere contribute differently to αT due to the different masses and lifetimes. This allows the measured value of αT to be interpreted as a measurement of the K/π ratio for Ep≳7TeV of 0.12-0.05+0.07, consistent with the expectation from collider experiments.
ISSN:	1550-7998 2470-0010 0556-2821 1550-2368 2470-0029 1089-4918
DOI:	10.1103/PhysRevD.81.012001