Positron
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The positron or antielectron is the particle with an electric charge of +1e, a spin of 1/2 ħ, and the same mass as an electron. It is the antiparticle of the electron. When a positron collides with an
Wilson cloud chambers used to be very important particle detectors in the early days of particle physics. They were used in the discovery of the positron, muon, and kaon.
Carl David Anderson
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Carl David Anderson was an American experimental physicist who shared the 1936 Nobel Prize in Physics with Victor Hess for his discovery of the positron, which confirmed the existence of antimatter.
Positron
…contributions: adding a magnetic field to his cloud chamber (in 1925), and by discovering charged particle cosmic rays, for which he is credited in Carl David Anderson's Nobel lecture. Likewise, in 1929 Chung-Yao Chao, a Chinese graduate student at Caltech, noticed some anomalous results that indicated particles…
Carl David Anderson
Photo by Anderson of the first positron ever observed, March 15, 1933