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About the Pictures Image Gallery
The positron or antielectron is the antiparticle or the antimatter counterpart of the electron. The positron has an electric charge of 1e, a spin of 1⁄2, and the same mass as an electron. When a low-energy positron collides with a low-energy electron, annihilation occurs, resulting in the production of two or more gamma ray photons (see electron-positron annihilation).
Positron Photo List