One particle per trillion in a suspected tau neutrino
beam (from left) strikes an iron nucleus, spraying
particles through layers of steel, plastic, and charge-detecting
emulsion (narrow bars). A telltale tau
lepton disintegrates (arrow), emitting a daughter
particle at a new angle. Line segments in emulsion
enable researchers to reconstruct particle tracks.
Credit: Illustrations adapted from Fermilab
Found in: Physics
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