neutron
nucleon (constituent of the nucleus of the atom) that has neutral electric charge (no charge); symbol n
free neutron
neutron existing outside the nucleus
delayed neutron
neutron emitted after a nuclear fission event, as a fission product daughter after beta decay, any time from a few milliseconds to a few minutes after the fission event
fast neutron
neutron with energy exceeding 1 MeV
prompt neutron
neutron immediately emitted by a nuclear fission event
thermal neutron
type of neutron