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A neutron with kinetic energy T= 25 eV strikes a stationary deuteron (heavy hydrogen nucleus).

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A neutron with kinetic energy T= 25 eV strikes a stationary deuteron (heavy hydrogen nucleus). Find the de Broglie wavelengths of both particles in the frame of their centre of inertia.

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Substitution gives λ'=8.6 pm

Since the momenta are equal in the CM frame the de Broglie wavelengths will also be equal. 

If we do not assume Md≈2Mn we shall get

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