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Japan is set to build the largest neutrino detector in history, after a cabinet committee approved billions of yen for its construction on 13 December, according to scientists involved in the project. Hyper-Kamiokande will hold 260,000 tonnes of ultrapure water — more than five times the amount contained by its already enormous sibling, the Super-Kamiokande. The new detector will be built inside a gigantic cavern to be dug next to Hida City’s Kamioka mine, and will, physicists hope, bring ground-breaking discoveries about these ubiquitous particles.
