Assertion: atom's neutron | /r/HasProperty | captured by uranium-238 nuclei
Facets:
value: to form uranium-239
type: PURPOSE
Source sentences:
text: Neutrons from the fission of uranium-235 are captured by uranium-238 nuclei to form uranium-239; a beta decay converts a neutron into a proton to form neptunium-239 (half-life 2.36 days) and another beta decay forms plutonium-239.