| Summary: | FPU The KM3NeT neutrino telescope has already gathered the first data and proven its capability for measuring atmospheric neutrino oscillations with the KM3NeT/ORC detector. The first stage of the KM3NeT/ORCA detector, KM3NeT/ORCA6, was operating with the first six detection lines deployed for almost two years until it was extended with additional lines. This thesis presents the first attempt to measure standard oscillations with the full dataset gathered by the KM3NeT/ORCA6 detector. The results are compared to other experiments measurements, showing that KM3NeT/ORCA yields promising results. The same data is exploited to probe invisible neutrino decay. The limits on the decay parameter provided by KM3NeT/ORCA6 are of the same order of magnitude as the current world-leading measurements. The same analysis is performed to drive the sensitivities that the full detector, KM3NeT/ORCA, with a total of 115 detection units, will yield in some years of data taking. The perspectives show very promising prospects for future research with the KM3NeT/ORCA detector. Ministerio de ciencia, innovación y universidades
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