Abstract
This chapter discusses resonance absorption. Resonance absorption in some fission product or structural material can be treated in many computer codes, but it has no great influence on the reactor behavior. Fission resonances are of no practical importance for thermal reactors; with possibly one exception—the low-lying Pu resonances. The amount of absorption in fertile materials determines the core reactivity and the conversion factor, hence, influencing the whole burn-up behavior of the reactor. If the resonance width is small compared to the maximum energy loss per collision with an absorber atom, one can assume that any collision, even with heavy absorber atoms, slows down the neutron outside the resonance. The narrow resonance (NR) approximation is not valid for some of the most important low-energy resonances of the fertile materials. A proper treatment of the low-lying resonances is important especially in the calculation of temperature coefficients.
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