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Using the average logarithmic energy decrement, estimate the number of collisions required to reduce the energy of 2 MeV neutrons emitted in fission to 0.0254

Using the average logarithmic energy decrement, estimate the number of collisions required to reduce the energy of 2 MeV neutrons emitted in fission to 0.0254 eV for collisions with H, D, Na, and U

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