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A beam of thermal neutrons emerges from a nuclear reactor and is incident on a crystal. The beam is Bragg scattered, as in Figure 3.5, from a crystal whose scattering planes are separated by 0.247 nm. From the continuous energy spectrum of the beam we wish to select neutrons of energy 0.0105 eV. Find the Bragg- scattering angle that results in a scattered beam of this energy. Will other energies also be present in the scattered beam at that angle?

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