Assertion: decay's neutron | /r/CreatedBy | fission
Facets:
value: in one generation
type: TEMPORAL
Source sentences:
text: Conventional fission power reactors also cause artificial transmutation, not from the power of the machine, but by exposing elements to neutrons produced by fission from an artificially produced nuclear chain reaction.
text: These delayed neutrons account for about 0.65% of the total neutrons produced in fission, with the remainder (termed "prompt neutrons") released immediately upon fission.
text: Depending on design, this process can contribute some one to ten percent of all fission reactions in a reactor, but too few of the average 2.5 neutrons produced in each fission have enough speed to continue a chain reaction.
text: Answers Neutron flow is regulated by using control rods that absorb neutrons, whereas the speed of the neutrons produced by fission is controlled by using a moderator that slows the neutrons enough to allow them to react with nearby fissile nuclei.
text: Subsequent work confirmed that fast neutrons were indeed produced by fission.
text: The effective neutron multiplication factor K is defined as the ratio of the number of neutrons produced by fission in one generation to the number in the preceding generation.
text: While the most of the neutrons produced in fission are prompt neutrons, the delayed neutrons are of importance in the reactor control.
text: Neutrons produced in fission, as noted above, have a Maxwell–Boltzmann distribution of kinetic energies from 0 to ~14 MeV, a mean energy of 2 MeV (for 235U fission neutrons), and a mode of only 0.75 MeV, which means that more than half of them do not qualify as fast (and thus have almost no chance of initiating fission in fertile materials, such as 238U and 232Th).
text: At criticality the chain reacting system is exactly in balance, such that the number of neutrons produced in fissions remains constant.