Final state effects in quantum fluids

Conference · Sun Jan 01 04:00:00 EST 1989

DOI:https://doi.org/10.1007/978-1-4899-2554-1_7· OSTI ID:6398822

Silver, R N

The extraction of momentum distributions from high energy scattering experiment depends on the validity of the impulse approximation (IA) which has been extensively discussed in the workshop overview. The IA assumes that in the scattering process the kinetic energy imparted to a recoiling particle is large compared to the potential energy due to neighboring particles. While this may be true for x-ray Compton scattering from electronic systems, it is less true for quasielastic electron-nucleus scattering, and it is invalid for deep inelastic neutron scattering (DINS) from quantum fluids and solids such as helium. In the latter case, the interatomic potential has a steeply repulsive core which is never negligible compared to the kinetic energies which can be imparted in feasible neutron scattering experiments. The corrections to the IA due to interactions of the recoiling atom with neighboring atoms are termed ''final state effects'' (FSE). This paper presents the theory of FSE for the case of deep inelastic neutron scattering from /sup 4/He quantum fluids. The lessons should also be applicable to momentum distribution experiments in many other systems. 28 refs., 12 figs.

• Research Organization: Los Alamos National Lab., NM (USA)
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 6398822
• Report Number(s): LA-UR-89-205; CONF-8810118-3; ON: DE89006525
• Country of Publication: United States
• Language: English

Related Subjects

640450* -- Fluid Physics-- Superfluidity
654003 -- Radiation & Shielding Physics-- Neutron Interactions with Matter
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
COHERENT SCATTERING
DEEP INELASTIC SCATTERING
DIFFRACTION
EVEN-EVEN NUCLEI
FLUIDS
HELIUM 4
HELIUM ISOTOPES
IMPULSE APPROXIMATION
INELASTIC SCATTERING
INTERACTIONS
ISOTOPES
LEPTON-BARYON INTERACTIONS
LEPTON-HADRON INTERACTIONS
LEPTON-NUCLEON INTERACTIONS
LIGHT NUCLEI
NEUTRON DIFFRACTION
NUCLEI
PARTICLE INTERACTIONS
PERTURBATION THEORY
QUANTUM FLUIDS
SCATTERING
STABLE ISOTOPES
SUPERFLUIDITY
TRAJECTORIES