First photo of antiproton annihilation

First photo of antiproton annihilation

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Caption: The first picture of an antiproton annihilation "star", found in 1955 in photographic emulsion used to detect subatomic particles. The emulsion was exposed to antiprotons from the Bevatron accelerator at the Lawrence Berkeley Laboratory, California. The photograph shows the antiproton entering from the top of the picture (track marked L); it travels 430 micrometres before colliding with a proton in the emulsion. Proton & antiproton mutually annihilate, their energy rematerialising as a number of new particles whose tracks form the "star". The tracks marked "a" & "b" are probably pions, the others probably protons.

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Keywords: antiproton, emulsion particle imagery, emulsion photo, first picture, image, odyssey, particle physics, pion, proton

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