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← ScienceWhich outcome occurs as prompt neutrons moderate rapidly reducing kinetic energy in a nuclear reactor?
A)Increased chain reaction multiplication
B)Decreased delayed neutron population
C)Resonance absorption by uranium-238✓
D)Fuel element corrosion from cavitation
💡 Explanation
Resonance absorption increases because the neutron capture cross-section of U-238 is high at specific intermediate energies; therefore, neutron population at those energies decrease, rather than increasing fission rates significantly at thermal energies under normal operational constraints.
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