Positron

Antiparticle of the electron, having positive electric charge (+1e).

Core Principles & Analysis

• Predicted by Paul Dirac in 1928 and discovered by Carl Anderson in cosmic rays in 1932.
• Annihilates with an electron to produce two 511 keV gamma-ray photons.
• Electron-positron annihilation underlies PET medical imaging.

Specifications & Metrics

• MASS: 0.511 MeV/c²
• SPIN: 1/2
• SYMBOL: e⁺