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Measuring the 7Be Neutrino Flux From the Sun: Calibration of the Borexino Solar Neutrino Detector
The Borexino solar neutrino detector is a real-time liquid scintillator detector designed to
measure sub-MeV neutrinos. With its unprecedented level of radio-purity, Borexino is poised
to provide the most precise measurements to-date of solar neutrino and geo-antineutrino
However, in order to reduce the systematic errors to sub-5% levels, the detector must be care-
fully calibrated to understand, among other things, the position and energy reconstructions.
To that end, the Virginia Tech component of the Borexino collaboration has constructed a
system for deploying and locating calibration sources within the detector. The system was
used in four separate calibration campaigns and deployed numerous sources in almost 300
locations throughout the detector. The data from the calibrations have already resulted in
the reduction of several sources of systematic error by a factor of two or more.
With the results from the calibration, the Borexino detector has entered a new era of low-
energy, high-precision, neutrino detection.
This work was supported by NSF Grant 0802114