Which particles and radiation are released during nuclear fission?

During nuclear fission, a heavy atomic nucleus splits into two smaller, highly unstable fission fragments. This process releases a variety of particles and radiation as the fragments and the resulting products move toward a more stable state.123

The primary emissions include:

• Neutrons: Fission typically releases several neutrons, which are essential for sustaining a chain reaction.142
• Beta Particles: The unstable fragments undergo beta decay, during which they emit electrons and antineutrinos.15
• Gamma Rays: As the excited fission products transition to lower energy states, they emit gamma rays, which are highly energetic photons.13
• Other Particles: Depending on the specific reaction, other subatomic particles such as protons may also be released.32

The energy released during these events is significant, with the majority appearing as prompt energy (primarily kinetic energy of the fragments and neutrons) and the remainder released over time through the radioactive decay of the fission products.52