Speaker
Description
The Super-Kamiokande (SK) detector, a 50-kiloton water Cherenkov detector in Japan’s Kamioka mine, has played a central role in neutrino physics since 1996, observing solar, atmospheric, and accelerator neutrinos. With the addition of gadolinium (SK-Gd), SK has significantly enhanced its sensitivity to low-energy electron antineutrinos through efficient neutron tagging, enabling searches for reactor antineutrinos originating primarily from Japanese nuclear power plants. The Wide-band Intelligent Trigger (WIT) is a real-time computing system with approximately 900 hyper-threaded CPU cores that plays a key role in extending SK’s sensitivity to low-energy events. WIT processes data in 23 ms windows, employing advanced vertex reconstruction and background rejection techniques to reliably identify events with recoil electron energies down to 2.5 MeV. We report results from reactor antineutrino searches in SK using WIT data, representing one of the first such measurements in a large water Cherenkov detector and providing complementary constraints on neutrino oscillation parameters, including sin²θ₁₂ and Δm²₂₁.
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