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What is a photograph? It is a permanent registration of shape in two dimensions by the interaction of scattered photons with the film. There have been thousands upon thousands of such pictures in the studies of elementary particle interactions.Įdit after observation in the comments that these tracks are like footprints, and not photographs of the particles. In conclusion, protons and antiprotons have been photographed, so yes, antimatter has been photographed. An antiproton can release a lot of energy which the proton cannot. What distinguishes a proton from an antiproton in the bubble chambers to start with is the charge. (If it had struck a neutron, the number of prongs would, by charge conservation, have to be odd.) In the top left corner of the picture, this antiproton annihilates with a proton constituent of a deuteron, producing a 6-pronged annihilation 'star’. The highlighted track is an antiproton, produced in the decay ofĪn antilambda into an antiproton and a pion

The dark lines in this picture are produced by charged particles as they force their way through liquid deuterium. (For details, click here.) Such tracks are a common feature in bubble chamber pictures and usually signify protons.

The longer highlighted track is clearly dark – it has produced a higher number of bubbles per centimetre than, say, the beam tracks this tells us that it is moving more slowly. Due to the kaon having interacted with a proton in the hydrogen, the rightmost beam track produces a spray of 4 tracks.