Speaker: Alessandro Paoloni (Istituto Nazionale di Fisica Nucleare)

JUNO is an experiment located in the GuangDong province of People’s Republic of China and dedicated to the measurement of the neutrino mass hierarchy through the detection of antineutrinos produced by two nuclear power plants.

The experiment is based on 20 kton of liquid scintillator read out by 17596 20″ photomultipliers and 25587 3″ photomultipliers. JUNO mass is one order of magnitude higher than previous experiments on solar neutrinos (Borexino) and reactor antineutrinos (KamLAND).

The unprecedented mass posed previously unknown complexities in the design and the realization of the experiment, which finally started data taking during August 2025.

In the seminar the experiment will be described and its performances reported. Given the optimal baseline and the large mass of the experiment, two months of data taking have been sufficient for the best up-to-date measurement of the solar neutrino oscillation parameters, entering the era of high precision in neutrino physics.