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The Franklin Institute announced that the 2007 Benjamin Franklin Medal in Physics is awarded to Yoji Totsuka, the former director general of KEK, and Arthur Mcdonald "for discovering that the three known types of elementary particles called neutrinos change into one another when traveling over sufficiently long distances, and that neutrinos have mass".
Totsuka was one of the central figure in the Kamiokande collaboration to report the first indication of the atmospheric neutrino in 1988. Later in 1998, he led the SuperKamiokande collaboration to the discovery of this phenomenon.
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