Three consecutive energy groups in an ultrane cross section library have absorption cross sections..

Three consecutive energy groups in an ultrane cross section
library have absorption cross sections of 5, 6, and 7 barns. If the energy
groups have the same width, and they are exposed to a neutron ux of 1.0 × 108
neutrons/cm2/s, 2.0 × 108 neutrons/ cm2/s, and 3.0 × 108 neutrons/cm2/s,
respectively, what is the absorption cross section for the collapsed energy
group?

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