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Abstract
Recent experimental evidence has indicated that there may be a reduction of about 1% in the Compton energy shift to the peak of a Compton profile measured in a solid (compared to the corresponding shift for a photon scattered from a stationary, free electron). In this note suggestions that electron-electron interactions between the valence electrons may be responsible for this defect are examined. It is concluded that, for the very large momentum transfers at which the experiments were conducted (k/kF ∼ 10), arguments based on collective interactions cannot explain the large energy of the Compton defects (< 10 eV) obtained experimentally.