Abstract
The electron momentum density in aluminum was measured by the Compton scattering of 59.54 keV gamma rays. A sharp discontinuity is observed in the momentum density near the free electron Fermi momentum. Above the Fermi momentum, only a small high-momentum tail is observed, in contrast with recent measurements using Mo Kα X-rays, and in agreement with positron annihilation results. In addition, excellent agreement is found between the experimental Compton profile above the Fermi momentum and that calculated from Hartree-Fock wave functions, again in disagreement with recent X-ray measurements.
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