Other
Scientific paper
Apr 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aipc..610..973d&link_type=abstract
NUCLEAR PHYSICS IN THE 21st CENTURY:International Nuclear Physics Conference INPC 2001. AIP Conference Proceedings, Volume 610,
Other
Neutrino, Muon, Pion, And Other Elementary Particle Detectors, Cosmic Ray Detectors, Solar Neutrinos
Scientific paper
The Borexino experiment, aimed at measuring the 7Be solar neutrinos, is currently under construction at the underground National Laboratories of Gran Sasso in central Italy. The Gran Sasso underground labs are located below 1,400 m of rocks. The equivalent shielding for cosmic rays is 3,800 m of water equivalent, and the residual muon flux is ~1/m2/h. The number of muons crossing the Borexino detector is 10,000/day, to be compared with the number of 7Be neutrino events in the central fiducial detector of ~10/day. A muon veto sub-detector was designed with the purpose of reducing background from muons and cosmogenic nuclides below 1 event per day in the spectral region of the equivalent energy between 250 and 800 keV, where the signal from the 7Be neutrinos is expected. The muon veto sub-detector consists of two separate parts. Four hundred photomultiplier tubes measure the scintillation photons and the Cerenkov photons produced by muons either in the 300 tons of scintillator or in the 1000 tons of pseudocumene buffer. Two hundred photomultiplier tubes measure the Cerenkov photons produced by muons in the water shield surrounding the pseudocumene buffer. The paper presents an overview of the muon background in Borexino and an estimate of the background reduction which is expected to be produced by the muon veto. A full discussion of the experimental apparatus is provided as well. .
Deutsch Martin
Galbiati Cristiano
Lendvai Christian
McCarty Kevin
Oberauer Lothar
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