Nuclear Energy Neutron Barium Gamma Figure 6. 1 Three steps in the neutron-induced fission of 235U. The combination of a neutron and 235U forms 236U in a highly excited state, that promptly fissions into two lighter nuclei, emitting neutrons and gamma rays in the process The two fragments are called fission products and they carry off about 160 Mev of kinetic energy from the fission reaction 复旦大学环境科学与工程系 Department of Environmental Science and Engineering, Fudan UniversityNuclear Energy The two fragments are called fission products, and they carry off about 160 MeV of kinetic energy from the fission reaction