The low-energy nuclear physics group operates the premier accelerator laboratory in the United States for studies with fast (MeV) neutrons. The absence of charge in the neutron allows the study of nuclear levels and transitions in the most direct manner. In nuclear structure physics, through inelastic neutron scattering, experiments yield energy thresholds for excited levels, excitations of the levels as a function of energy, decay angular distributions, and lifetimes of levels in nuclei by avoiding the feeding of excited states above the level of interest. These measurements lead to an important tool for testing nuclear models, the transition strengths. In addition, our facility allows the study of nuclear reactions for nuclear astrophysics by measuring the cross-sections of interest; thus giving insight into fundamental theories of cosmology. Cross sections for neutron-induced reactions are also obtained for a variety of applications.