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Proton decay experiment to determine the ultimate stability of matter. .Proton decay. A technician holding a 20" (50cm) photomultiplier tube used in the search for proton decay. Hundreds of such tubes line a tank containing 9000 tons of water some 1000 meters underground in a zinc mine in Japan. Japan. (1985)

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Proton decay experiment to determine the ultimate stability of matter. .Proton decay. A technician holding a 20" (50cm) photomultiplier tube used in the search for proton decay. Hundreds of such tubes line a tank containing 9000 tons of water some 1000 meters underground in a zinc mine in Japan. Japan. (1985)