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The world's first
neutrino observation in a hydrogen bubble chamber was found Nov. 13, 1970, on
this historical photograph from the Zero Gradient Synchrotron's 12-foot bubble
chamber. The invisible neutrino strikes a proton where three particle tracks
originate (right). The neutrino turns into a mu-meson, the long center track.
The short track is the proton. The third track is a pi-meson created by the
collision.
From: Argonne National Laboratory
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