Gianpaolo Bellini (physicist)

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Gianpaolo Bellini (12 June 1935 – 12 August 2026) was an Italian experimental physicist, who was Emeritus Professor of Physics at the University of Milan and emeritus Scientist of the Istituto Nazionale di Fisica Nucleare (INFN). He is known for pioneering work in low-background neutrino detection and for leading the Borexino experiment at the Gran Sasso National Laboratory, which performed precision spectroscopy of solar neutrinos — including the first direct evidence of the CNO cycle — and measurements of geoneutrinos. Earlier in his career he introduced silicon active targets and micro-vertex techniques that enabled the first lifetime measurements of charmed hadrons at fixed-target experiments.