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.
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