Theory of neutron scattering experiments on momen tum distributions in quantum fluids
Abstract
The first perturbative derivation of the final state corrections to the impulse approximation for deep inelastic neutron scattering experiments was presented. The final state broadening is found to depend on g(r) and the HeHe phase shifts. The theory satisfies the fsum rule, the omega sup 2 sum rule (kinetic energy) valid at high Q, and the omega sup 3 sum rule. In the structure of the theory, the selfenergy terms alone would lead to quasiLorentzian broadening. However, these are exactly cancelled by a part of the vertex terms which introduce g(r). Numerical results are presented for superfluid He.
 Publication:

Presented at the 11th International Workshop on Condensed Matter Theories
 Pub Date:
 1987
 Bibcode:
 1987cmt..work.....S
 Keywords:

 Fluids;
 Momentum;
 Neutron Scattering;
 Quantum Mechanics;
 Helium;
 Inelastic Scattering;
 Kinetic Energy;
 Lorentz Force;
 Superfluidity;
 Atomic and Molecular Physics