Neutron interactions refer to the ways in which neutrons, neutral subatomic particles found in atomic nuclei, engage with other matter. These interactions can occur through various processes, such as elastic scattering, where neutrons bounce off nuclei without losing energy, or inelastic scattering, where they transfer energy to the nucleus, causing it to become excited. Neutrons are crucial in nuclear reactions, including those in nuclear reactors and nuclear weapons. They can initiate fission in heavy elements like uranium or plutonium, leading to the release of significant energy. Understanding neutron interactions is essential for advancements in nuclear physics and radiation therapy.