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A beam of neutrons of energy 50 keV is incident on a slab of graphite of thickness 2.5 cm. The transmitted beam has an intensity

A beam of neutrons of energy 50 keV is incident on a slab of graphite of thickness 2.5 cm. The transmitted beam has an intensity of 26% of the original beam. What value does this indicate for the scattering phase shift? (It is a good approximation to neglect all but the s-wave phase shift. Why?)

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