MORE evidence has emerged that at least one of three subatomic particles
known as neutrinos has a mass, albeit tiny, physicists said last week.
The team, led by Yoji Totsuka of Tokyo University, say data from the
Super-Kamiokande detector in Japan suggest neutrinos created in the atmosphere
“oscillate” into another neutrino type. This can only happen if the neutrinos
have different masses.
Data from a detector in Minnesota suggested a similar result last year (
91av, Science, 28 June 1997, p 14). Neutrinos with mass could make
up most of the invisible dark matter in the Universe.
