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 Relative Articles Cosmogenic Backgrounds in Borexino at 3800 m water-equivalent depth Muon and Cosmogenic Neutron Detection in Borexino Seasonal modulation in the Borexino cosmic muon signal The Gran Sasso muon puzzle Measurement of CNGS muon neutrino speed with Borexino Borexino Geoneutrinos in Borexino Measurement of Muon Annual Modulation and Muon-Induced Phosphorescence in NaI(Tl) Crystals with DM-Ice17 CNO and pep neutrino spectroscopy in Borexino: Measurement of the deep underground production of cosmogenic 11C in organic liquid scintillator GPS-based CERN-LNGS time link for Borexino More...
Physics  2012

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

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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.

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