Neutronic Analysis For Nuclear Reactor Systems pp 303-348 | Cite as

# Resonance Processing

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## Abstract

In this chapter, we will study the Doppler broadening of resonances. Doppler effect improves reactor stability. Broadened resonance or heating of a fuel results in a higher probability of absorption, thus causing negative reactivity insertion or reduction of reactor power. One of the most important virtues of the optical model is that it takes into account the existence of *giant* or *broad resonances* in the total cross section as part of neutronic analysis for nuclear reactor systems. For resonances of energy levels, which are spaced widely apart, we can describe the energy dependency of the absorption cross section via *Breit*-*Wigner single*-*level resonance formula*.

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