3Q: Scientists shave estimate of neutrino’s mass in half

KATRIN’s spectrometer, shown here, precisely measures the energy of electr

KATRIN’s spectrometer, shown here, precisely measures the energy of electrons emitted in the decay of tritium, which has helped scientists come closer to pinning down the mass of the ghost-like neutrino. Image: The KATRIN Collaboration

Joseph Formaggio explains the discovery that the ghostly particle must be no more than 1 electronvolt, half as massive as previously thought.

Prof. Joseph Formaggio speaks with Clara Moskowitz of Scientific American about how an international team of researchers (including MIT scientists) has found that a neutrino cannot weigh more than one electron volt. "Neutrinos seem to have broken our understanding of what the Standard Model was supposed to be," says Formaggio.


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