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Nature 446, 837 (19 April 2007) | doi:10.1038/446837b; Published online 18 April 2007

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Evidence for fourth neutrino fades

Jenny Hogan

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Fermilab detector quashes sterile particle.

A nine-year effort to resolve a mystery about the behaviour of neutrinos — particles that interact only weakly with matter — has thrown up an unexpected signal. The findings, announced on 11 April, leave open the possibility that new physics hides within the observations, but winnows the options for what that might be.

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Particle physics Wobbly oscillations

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