Early positron observations, 1930s

Early positron observations, 1930s

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Credit: EMILIO SEGRE VISUAL ARCHIVES/AMERICAN INSTITUTE OF PHYSICS/SCIENCE PHOTO LIBRARY

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Caption: Early positron observations. Cloud chamber images showing tracks produced by the newly discovered positron, the antimatter equivalent of the electron. At left are tracks (white lines) produced by electrons curving to the left, while the tracks curving to the right are the positrons. They are part of a shower of particles produced by the impact of a cosmic ray, with the same shower shown in reverse at right. Observations at Caltech in August 1932 by US physicist Carl A. Anderson led to his 1936 Nobel Prize in Physics. These images, from Caltech's Chair, physicist Robert Andrews Millikan, were published in 'Atoms, Men and Stars' (1937).

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