Carl David Anderson (1905–1991) was an American physicist known for his pioneering work in the field of particle physics. He is perhaps best known for his discovery of the positron in 1932, a crucial finding that provided evidence for the existence of antimatter. The positron is the antiparticle of the electron, and its discovery had significant implications for both theoretical and experimental physics.
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Carl David Anderson identified the Positron through curved tracks in a cloud chamber. A lead plate changed a particle's momentum, helping determine its direction of travel from the curvature on either side. The combined curvature and range excluded a proton interpretation for the light positively charged particle. His 1933 paper separates the measured charge and mass constraints from speculative explanations then considered for the particle's origin.[ref]
The Positive Electron by Carl David Anderson. 1933, lead-plate photographs, direction of travel and range/curvature argument
A physicist.[ref]
Carl David Anderson by William Hayward Pickering. Biographical Memoirs: Volume 73; Independent professional biography and identity
Portrait of Carl David Anderson
. Unidentified photographer; Smithsonian Institution Libraries, Dibner Library, Scientific Identity portrait collection, SIL14-A5-01. No known copyright restrictions: Smithsonian / Flickr Commons institutional determination; not a Creative Commons license or a blanket public-domain assertion., via Wikimedia Commons. Source.
