Nuclear physics is a science dealing with structures, elements and forces of the nuclei.
An example of nuclear physics is the study of how nuclear power works.
the branch of physics dealing with the structure of atomic nuclei, nuclear forces, the interaction between particles and nuclei, the fission process, the study of radioactive decay, etc.
noun(used with a sing. verb)
The scientific study of the forces, reactions, and internal structures of atomic nuclei.