Evidence has been growing that the fundamental particles known as neutrinos oscillate — one type of neutrino can transform into another type. A well-placed experiment now points to the definitive answer.
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KAMLAND COLLABORATION

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Wark, D. Now you see them, now you don't. Nature 421, 485–486 (2003). https://doi.org/10.1038/421485a
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DOI: https://doi.org/10.1038/421485a
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