Sometimes ultrane cross section libraries use different values for the width of the energy groups in

Sometimes ultrane cross section libraries use different
values for the width of the energy groups in the resonance energy range.
Suppose that three consecutive energy groups in an ultrane cross section
library have absorption cross sections of 10, 30, and 12 barns in the resonance
energy range. If the rst group is 10 eV wide, the second group is 20 eV wide,
and the third group is 10 eV wide, and the groups are exposed to a neutron ux
of 2 × 108 neutrons/cm2/s, 1 × 108 neutrons/cm2/s, and 2 × 108 neutrons/cm2/s,
respectively, what is the absorption cross section for the collapsed energy
group? What physical “entity” does the central energy group in the ultrane
cross section library most likely contain?

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