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 Automatic translation  Automatic translation Category: matter and particles
Updated July 11, 2022
  alpha decay

Image: Decay of radium-226 (from the Latin radius “radius”.
This large nucleus of 226 nucleons (88 protons and 138 neutrons) emits an alpha particle composed of two protons and two neutrons. It then transforms into a radon-222 nucleus, itself radioactive, containing two protons and two fewer neutrons. The decay releases 4.6 million electron volts of energy (MeV).
Credit: National Institute of Nuclear Physics and Particle Physics (IN2P3).

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