Tell us about the mechanism of the nuclear chain reaction.

A nuclear reaction occurs when the nuclei of atoms interact with each other, or with an elementary particle. This physical process leads to a change inside the nucleus (it either divides or releases other elementary particles from itself). The kinetic energy of particles increases sharply, all this leads to a nuclear reaction. In the case when such nuclear reactions are in the stage of self-reproduction and self-maintenance, a nuclear chain reaction occurs. Such a mechanism takes place due to the repeated and repeated interaction of the separated particles of one nuclear reaction with the particles of the beginning of another nuclear reaction. As a result of this process, multiple fission of nuclei occurs, forming an avalanche. This is how a nuclear explosion occurs. But if you manage to maintain a nuclear chain reaction at the same level – this is called a controlled nuclear chain reaction. It is used for peaceful industrial purposes, such as nuclear power plants.