Neutrino oscillations, the flavour transitions of neutrinos during propagation, confirm nonzero neutrino masses, providing compelling evidence for physics beyond the Standard Model. This review synthesises two landmark experiments: Super-Kamiokande’s atmospheric neutrino observations, led by Takaaki Kajita, and Daya Bay’s precision reactor antineutrino measurements, driven by Yifang Wang. Super-Kamiokande’s zenith-angle dependent muon neutrino deficits established neutrino mass, while Daya Bay’s high-precision measurement of θ₁₃—the last unknown mixing angle—enabled leptonic CP violation searches. We critically compare their methodologies, systematic challenges, and impacts, incorporating recent global fits (NuFIT 5.3, 2023) and open questions like the mass hierarchy and sterile neutrinos. These experiments advance particle physics, nuclear reactor monitoring, supernova detection, and cosmology, inspiring global scientific outreach.
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