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https://www.umass.edu/physics/news/borexino-solar-neutrino-detector Borexino Solar Neutrino Detector : Physics : UMass Amherst The Borexino prototype detector (CTF) shown here, a 4-ton spherical scintillator target surrounded by ultra-pure water and 100 photomultiplier tubes, operated... solar neutrinoborexinodetectorphysicsumass https://www.umass.edu/physics/news/inside-borexino-sphere-0 Inside the Borexino sphere : Physics : UMass Amherst Inside view of the Borexino stainless steel sphere, prior to nylon vessel installation and fluid filling. The sphere is 13.7 meters in diameter; the picture... insideborexinospherephysicsumass