Discovering Antimatter! (August 2, 1932)Carl David Anderson discovered the positron (e⁺) particle, the first evidence of antimatter, when he allowed cosmic rays to pass through a cloud chamber and a 6 mm lead plate. A magnet surrounded this apparatus, causing particles to bend in different directions based on their electric charge. The ion trail left by each positron appeared on the photographic plate with a curvature matching the mass-to-charge ratio of an electron, but in a direction that showed its charge was positive. For this work he won the Nobel Prize in physics in 1936, he was the youngest man to win the Nobel prize and it was a discovery that permanently reshaped our view of the universe. The apparatus was located on the third floor of the Guggenheim Aeronautical Laboratory at the California Institute of Technology (GALCIT).
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