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Obituaries

Neutrino hunter Masatoshi Koshiba, Nobel laureate, dies at 94

Japanese physicist celebrated for work on detecting elusive particle

TOKYO (Kyodo) -- Japanese scientist Masatoshi Koshiba, a co-winner of the 2002 Nobel Prize in physics for his pioneering contribution in the field of astrophysics, has died, the University of Tokyo said Friday. He was 94.

Koshiba, a distinguished professor at the university, confirmed the existence of cosmic neutrinos by devising and using a detector called Kamiokande, composed of photomultiplier tubes in a 3,000-ton cylindrical water tank placed 1,000 meters underground, in Gifu Prefecture, central Japan.

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