Fast neutrons are high-energy neutrons that have not been thermalized, meaning they move at speeds much higher than those of neutrons in thermal equilibrium with their surroundings. They play a crucial role in nuclear reactors and weapons due to their ability to induce fission in certain isotopes more effectively than thermal neutrons.

Fast Neutrons

High-energy neutrons

Thermalized neutrons

Neutrons in thermal equilibrium

Nuclear reactors are devices used to initiate and control a sustained nuclear chain reaction, primarily for electricity generation or research purposes. They operate on the principle of nuclear fission, where the nucleus of an atom splits into smaller parts, releasing a significant amount of energy in the process.

Nuclear Reactors

Nuclear weapons are explosive devices that derive their destructive force from nuclear reactions, either fission or a combination of fission and fusion. They represent both a significant deterrent in international relations and a profound existential threat to humanity due to their potential for mass destruction and long-term environmental impact.

Nuclear Weapons

Induce fission

Certain isotopes

Thermal neutrons are neutrons that have been slowed down to energies comparable to the thermal energy of particles at room temperature, typically around 0.025 eV. They play a crucial role in nuclear reactions, particularly in nuclear reactors, where they facilitate the fission process by increasing the likelihood of interaction with fissile material.

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