Image:First neutrino observation.jpg

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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, http://www.anl.gov/Science_and_Technology/History/Anniversary_Frontiers/86photo.html

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