Assertion: heavy water's neutron | /r/HasProperty | released
Facets:
value: during the fissioning
type: TEMPORAL
value: from fission
type: OTHER
value: from a uranium fission event
type: OTHER
Source sentences:
text: In this case potentially all of the neutrons being released can be moderated and used in reactions with the 235U, in which case there is enough 235U in natural uranium to sustain criticality.
text: Because more free neutrons are released from a uranium fission event than thermal neutrons are required to initiate the event, the reaction can become self-sustaining – a chain reaction – under controlled conditions, thus liberating a tremendous amount of energy (see article nuclear fission).
text: More neutrons are released than are needed to maintain the chain reaction; when uranium-238 absorbs just the excess, plutonium is created, which helps to make up for the depletion of uranium-235.
text: A moderator increases the power of the reactor by causing the fast neutrons that are released from fission to lose energy and become thermal neutrons.
text: Subsequent studies in early 1939 (one of them by Szilárd and Fermi) revealed that several neutrons were also released during the fissioning, making available the opportunity for the nuclear chain reaction that Szilárd had envisioned six years previously.
text: Heavy water is used to slow down the neutrons that are released due to fission in the reactors.
text: If more neutrons are released than are lost or absorbed by other materials, the chain reaction is said to achieve criticality.