In a nuclear fission of the uranium for example, the uranium atom can be subdivided in Kr and Ba + 2 neutrons + energy dissipated. This energy comes from the mass defect of the uranium in relation to Kr+Ba+2 neutrons. Is this energy full released in the form of photons? Is this energy full used to accelerate (increase kinetic energy) of the products? Or is it used by both processes? In this case, what will be the more significant one ?