Speaker
Description
The Super-Kamiokande experiment (Super-K) is a water Cherenkov detector in Japan. It has been collecting atmospheric neutrino events in ultrapure water from 1996 to 2020, after which it was upgraded with the addition of Gadolinium sulfate in the water. Tau neutrinos are not expected in the atmospheric neutrino flux below 10 GeV unless they appear from the oscillation of atmospheric muon neutrinos. Super-K is capable of detecting these oscillated tau neutrinos - which would be an unambiguous confirmation of neutrino oscillations. In the last published results from Super-K in 2018 with 328 kt year exposure, the hypothesis of no tau neutrino appearance was rejected with 4.6 sigma significance. The current analysis uses all of the data collected on the pure water phase, corresponding to 484 kt year. The statistics have been significantly increased by expanding the fiducial volume of the detector from 22.5 kt to 27.2 kt. In total, nearly 50% more events have been added to the analysis.
| Collaboration / Activity | Super-Kamiokande Experiment |
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