Neutrinos’ identity shift snares physics Nobel

Elusive particles must have mass, measurements in Japan, Canada showed

McDonald and Kajita

NEUTRINO NOBEL  Arthur McDonald (left) and Takaaki Kajita shared the Nobel Prize in physics for the discovery that neutrinos oscillate between different types, which demonstrates that the particles have mass.

From left: K. MacFarlane/Queen's Univ./SNOLAB; Courtesy of the Univ. of Tokyo. 

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