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Neutrinos are elementary particles which are known since many years asfundamental messengers from the interior of the Sun. The Standard Solar Model,which gives a theoretical description of all nuclear processes which happen inour star, predicts that roughly 99% of the energy produced is coming from aseries of processes known as the "pp chain". Such processes have been studiedin detail over the last years by means of neutrinos, thanks also to theimportant measurements provided by the Borexino experiment. The remaining 1% isinstead predicted to come from a separate loop-process, known as the "CNOcycle". This sub-dominant process is theoretically well understood, but has sofar escaped any direct observation. Another fundamental aspect is that the CNOcycle is indeed the main nuclear engine in stars more massive than the Sun. In2020, thanks to the unprecedented radio-purity and temperature control achievedby the Borexino detector over recent years, the first ever detection ofneutrinos from the CNO cycle has been finally announced. The milestone resultconfirms the existence of this nuclear fusion process in our Universe. Here,the details of the detector stabilization and the analysis techniques adoptedare reported.

First detection of CNO neutrinos with Borexino