BOREXINO Detector Core of the detector: 300 tons of liquid scintillator contained in a nylon vessel of 4.25 m radius (PC+PPO); 1 st shield: 1000 tons of ultra-pure buffer liquid (pure PC) contained in a stainless steel sphere of 7 m radius; 2214 photomultiplier tubes pointing towards the center to view the light emitted by the scintillator; 2 nd shield: 2000 tons of ultra-pure water contained in a cylindrical dome; 200 PMTs mounted on the SSS pointing outwards to detect light emitted in the water by muons crossing the detector;
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