First batch of scintillator (~11,000 liters) in Borexino!
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Inside view of the Borexino detector (from camera #7). Second phase of Borexino filling operations has begun. Water in IV and SSS is being replaced by scintillator (PC+PPO) and buffer fluid (PC+DMP). The first 11,000 liters of scintillator are in the inner vessel (you can see it at the top of the IV).
“The 2021 Giuseppe and Vanna Cocconi Prize for an outstanding contribution to Particle Astrophysics and Cosmology is awarded to the Borexino collaboration for the groundbreaking observation of solar neutrinos from the pp and CNO chains that provided unique and comprehensive tests of the Sun as a nuclear fusion engine.”