Reactor Physics is the study of the behavior of nuclear reactors, focusing on how nuclear fission reactions occur and are controlled. It involves understanding the interactions between neutrons, fuel, and materials within the reactor core. Key concepts include neutron diffusion, multiplication factors, and the balance of reactivity to ensure safe and efficient operation. The field also examines the design and operation of different types of reactors, such as pressurized water reactors and boiling water reactors. By analyzing these systems, scientists and engineers can optimize energy production while minimizing risks associated with radiation and reactor safety.