PROMPT NEUTRON

in nuclear fission reactions, nuclear particle without an electric charge that is emitted instantaneously by a nucleus undergoing fissionin contrast to a delayed neutron, which is emitted by an excited nucleus among the fission products at an appreciable time interval (milliseconds to minutes) after fission has occurred. Most neutrons released in fission reactions are prompt; for example, only about 0.7 percent of the neutrons emitted in uranium-235 fission are delayed.