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DONUT Details: Creating a Tau Neutrino Beam
Fermilab's accelerators create beams of protons and their antiparticles. To obtain a neutrino beam, physicists direct a high-energy proton beam toward a block of high-density material like tungsten. When protons collide with atoms in the target, many different particles emerge, including neutrinos. Very strong magnets remove all charged particles from the beam. Fifteen meters of shielding stop all other particles -- except neutrinos, including the relatively rare tau neutrino.
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