Reactor data hint at existence of fourth neutrino
Deficit in antiparticle output exceeds theoretical expectations
GHOST FINDER New results of experiments at the Daya Bay neutrino detector (walls lined with photomultiplier tubes, shown) hint at the existence of a lightweight sterile neutrino, about one-millionth the mass of an electron.
Brookhaven National Laboratory/Flickr (CC BY-NC-ND 2.0)
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