Electron-positron annihilation

Electron-positron annihilation is the process that occurs when an electron (which is matter) and a positron (which is antimatter) collide. They destroy each other and produce two gamma ray photons, of 511 keV each, in opposite directions.

The opposite process is known as pair production.

See also:

• Annihilation
• Electromagnetic spectrum (shows that the photons are in the high-energy range)