Journal
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
Volume -, Issue 5, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1475-7516/2012/05/015
Keywords
neutrino experiments; neutrino detectors
Funding
- INFN (Italy)
- NSF (U.S.A.)
- BMBF (Germany)
- DFG (Germany)
- MPG (Germany)
- NRC (Russia)
- MNiSW (Poland)
- Direct For Mathematical & Physical Scien
- Division Of Physics [1102798, 0802114] Funding Source: National Science Foundation
- Division Of Physics
- Direct For Mathematical & Physical Scien [0802646, 0902140, 1103987] Funding Source: National Science Foundation
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We have measured the muon flux at the underground Gran Sasso National Laboratory (3800 m w.e.) to be (3.41 +/- 0.01) . 10(-4)m(-2)s(-1) using four years of Borexino data. A modulation of this signal is observed with a period of (366 +/- 3) days and a relative amplitude of (1.29 +/- 0.07)%. The measured phase is (179 +/- 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 +/- 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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