Earlier in the chapter we learned that the absorption cross sections of many materials exhibit a 1/v

Earlier in the chapter we learned that the absorption cross
sections of many materials exhibit a 1/v dependence on the neutron velocity in
the thermal energy range (below ~2 eV). In other words, if σat is the
value of the thermal absorption cross section for an isotope at a thermal
velocity vt corresponding to 2200 m/s, show that the thermal absorption cross
section at any energy below 2 eV is given by σa(E) = ( . 0 025 E ) ( )sat

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