Dr Koshiba's second detector showed that neutrinos, previously believed to be massless, actually have a small mass.
ECONOMIST: The 2002 Nobel prizes: Windows on the world | The
The neutrino prize was shared by Raymond Davis and Masatoshi Koshiba.
Dr Koshiba's device, which worked by detecting light generated as a result of collisions between neutrinos and the electrons in water, was located down a Japanese zinc mine.
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