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

P. Adamson, C. Andreopoulos, K. E. Arms, R. Armstrong, D. J. Auty, D. S. Ayres, C. Backhouse, J. Barnett, G. Barr, W. L. Barrett, B. R. Becker, M. Bishai, A. Blake, B. Bock, G. J. Bock, D. J. Boehnlein, D. Bogert, C. Bower, S. Cavanaugh, J. D. ChapmanD. Cherdack, S. Childress, B. C. Choudhary, J. H. Cobb, S. J. Coleman, D. Cronin-Hennessy, A. J. Culling, I. Z. Danko, J. K. De Jong, N. E. Devenish, M. V. Diwan, M. Dorman, C. O. Escobar, J. J. Evans, E. Falk, G. J. Feldman, T. H. Fields, M. V. Frohne, H. R. Gallagher, A. Godley, M. C. Goodman, P. Gouffon, R. Gran, E. W. Grashorn, K. Grzelak, A. Habig, D. Harris, P. G. Harris, J. Hartnell, R. Hatcher, K. Heller, A. Himmel, A. Holin, J. Hylen, G. M. Irwin, Z. Isvan, D. E. Jaffe, C. James, D. Jensen, T. Kafka, S. M.S. Kasahara, G. Koizumi, S. Kopp, M. Kordosky, K. Korman, D. J. Koskinen, Z. Krahn, A. Kreymer, K. Lang, J. Ling, P. J. Litchfield, L. Loiacono, P. Lucas, J. Ma, W. A. Mann, M. L. Marshak, J. S. Marshall, N. Mayer, A. M. McGowan, R. Mehdiyev, J. R. Meier, M. D. Messier, C. J. Metelko, D. G. Michael, W. H. Miller, S. R. Mishra, J. Mitchell, C. D. Moore, J. Morfín, L. Mualem, S. Mufson, J. Musser, D. Naples, J. K. Nelson, H. B. Newman, R. J. Nichol, T. C. Nicholls, J. P. Ochoa-Ricoux, W. P. Oliver, T. Osiecki, R. Ospanov, S. Osprey, J. Paley, R. B. Patterson, T. Patzak, G. Pawloski, G. F. Pearce, E. A. Peterson, R. Pittam, R. K. Plunkett, A. Rahaman, R. A. Rameika, T. M. Raufer, B. Rebel, J. Reichenbacher, P. A. Rodrigues, C. Rosenfeld, H. A. Rubin, V. A. Ryabov, M. C. Sanchez, N. Saoulidou, J. Schneps, P. Schreiner, P. Shanahan, W. Smart, C. Smith, A. Sousa, B. Speakman, P. Stamoulis, M. Strait, N. Tagg, R. L. Talaga, J. Thomas, M. A. Thomson, J. L. Thron, G. Tinti, R. Toner, V. A. Tsarev, G. Tzanakos, J. Urheim, P. Vahle, B. Viren, M. Watabe, A. Weber, R. C. Webb, N. West, C. White, L. Whitehead, S. G. Wojcicki, D. M. Wright, T. Yang, M. Zois, K. Zhang, R. Zwaska

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53 Scopus citations

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 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.

Original languageEnglish (US)
Article number012001
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume81
Issue number1
DOIs
Publication statusPublished - Jan 6 2010
Externally publishedYes

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ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)

Cite this

Adamson, P., Andreopoulos, C., Arms, K. E., Armstrong, R., Auty, D. J., Ayres, D. S., ... Zwaska, R. (2010). Observation of muon intensity variations by season with the MINOS far detector. Physical Review D - Particles, Fields, Gravitation and Cosmology, 81(1), [012001]. https://doi.org/10.1103/PhysRevD.81.012001