Masters of disguise


By Alexander Hellemans FOR more than three decades, physicists have been puzzling over the fact that their detectors only seem able to pick up about one-third of the neutrinos thought to be produced by the Sun’s nuclear furnace. Now an experiment in Japan may have provided the answer: neutrinos transform, or oscillate, from one type to another during flight, and so evade detectors hunting for just one type. “We’ve been trying to demonstrate neutrino oscillations with terrestrial experiments for 28 years…[this experiment] may finally have done it,
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