Super-Kamiokande is a large underground neutrino observatory located in the Kamioka mine near Hida City, Japan. It was built to study neutrinos, which are elementary particles that are very light and interact only weakly with matter. The facility consists of a large cylindrical tank filled with 50,000 tons of ultra-pure water, surrounded by thousands of sensitive light detectors known as photomultiplier tubes (PMTs).
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