Delayed fission neutrons are neutrons that are released 0.1 to 1s after the fission of a nucleus by the neutron-rich fission products. This may be caused by the decay of the fission products. The excess neutrons in the fission products absorb the energy of the decay and are expelled from the nucleus of the element if the energy of the decay is greater than the binding energy of the neutrons. These delayed fission neutrons have energies that are typically in the range of 200-500 KeV. Because these delayed neutrons are closer to the thermal energies they are more important than the prompt fission neutrons. They are created by lower-energy neutrons as fewer neutrons are knocked off in a fission reaction, leaving more neutrons to be released as delayed fission neutrons.
[[Delayed Critical Conditions]] – needs delayed neutrons to sustain the nuclear reaction
[[Delayed Neutron Fraction]] – ratio of delayed neutrons to total neutrons.
Delayed Neutron Precursor
Point Reactor Kinetics Model – simulates delayed neutrons.
Fission Products – created by delayed fission neutrons
[[Fast Reactor]] – has fewer delayed neutron
Sources
- NE560 – Lecture 1: Intro to Kinetics and Dynamics, (Aug. 17, 2020). Accessed: May 25, 2023. [Online Video]. Available: https://www.youtube.com/watch?v=OPfowMUJCrk
Backlinks
[[Nuclear Reactor]]
[[Prompt Fission Neutrons]]