Solar Neutrinos with Borexino: First evidence of CNO fusion cycle

Borexino experiment, located at the Laboratori Nazionali del Gran Sasso, was built with a primary goal of the Be7 solar neutrino detection. In more than 12 years of data taking, Borexino has not only demonstrated the unprecedentedly high sensitivity towards Be7 solar neutrinos, but performed the comprehensive study of low-energy neutrinos from the complete pp-chain, the dominant process in the Sun fusion. After a number of developments in both hardware and software, Borexino presents the first experimental evidence of the elusive carbon-nitrogen-oxygen (CNO) fusion cycle in the Sun. The absence of the CNO neutrinos signal is disfavoured by the Borexino experiment at 5σ