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#### Cosmic-muon flux and annual modulation in Borexino at 3800 m water-equivalent depth

##### MPS-Authors
http://pubman.mpdl.mpg.de/cone/persons/resource/persons30794

Maneschg,  W.
Division Prof. Dr. Manfred Lindner, MPI for Nuclear Physics, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons31050

Simgen,  H.
Division Prof. Dr. Manfred Lindner, MPI for Nuclear Physics, Max Planck Society;

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1202.6403
(Preprint), 2MB

##### Supplementary Material (public)
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##### Citation

Bellini, G., Benziger, J., Bick, D., Bonfini, G., Bravo, D., Avanzini, M. B., et al. (2012). Cosmic-muon flux and annual modulation in Borexino at 3800 m water-equivalent depth. Journal of Cosmology and Astroparticles Physics, 2012(05): 015, pp. 1-13. Retrieved from http://arxiv.org/abs/1202.6403.

Cite as: http://hdl.handle.net/11858/00-001M-0000-000E-ACC1-1
##### Abstract
We have measured the muon flux at the underground Gran Sasso National Laboratory (3800 m w.e.) to be (3.41 \pm 0.01) \times 10-4m-2s-1 using four years of Borexino data. A modulation of this signal is observed with a period of (366\pm3) days and a relative amplitude of (1.29 \pm 0.07)%. The measured phase is (179 \pm 6) days, corresponding to a maximum on the 28th of June. Using the most complete atmospheric data models available, muon rate fluctuations are shown to be positively correlated with atmospheric temperature, with an effective coefficient {\alpha}T = 0.93 \pm 0.04. This result represents the most precise study of the muon flux modulation for this site and is in good agreement with expectations.