Assertion: decay's neutron | /r/HasProperty | slowed by their collisions
Facets:
value: with the tamper nuclei
type: OTHER
Source sentences:
text: Because a bomb relies on fast neutrons (not ones moderated by reflection with light elements, as in a reactor), the neutrons reflected by a tamper are slowed by their collisions with the tamper nuclei, and because it takes time for the reflected neutrons to return to the fissile core, they take rather longer to be absorbed by a fissile nucleus.