Momentum distributions and the impulse approximation in helium

Journal Article · Sat Mar 01 04:00:00 EST 1986 · J. Low Temp. Phys.; (United States)

DOI:https://doi.org/10.1007/BF00683406· OSTI ID:5601473

Tanatar, B; Lefever, G C; Glyde, H R

The momentum distribution n( p) of atoms in condensed matter may be determined from neutron inelastic scattering measurements. However, scattering at high momentum transfers hQ (high enough that the impulse approximation holds) is required. A model of solid helium is used to assess the error introduced in n( p) by assuming the impulse approximation holds at several Q values. At Q = 20 A/sup -1/ the error in n( p) is approx. 5-10%. This error can be reduced by a factor of ten using a symmetrization procedure.

• Research Organization: Department of Physics, University of Delaware, Newark, Delaware
• OSTI ID: 5601473
• Journal Information: J. Low Temp. Phys.; (United States), Journal Name: J. Low Temp. Phys.; (United States) Vol. 62:5; ISSN JLTPA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360602* -- Other Materials-- Structure & Phase Studies
ATOMS
COHERENT SCATTERING
DIFFRACTION
ELEMENTS
ERRORS
FLUIDS
FORM FACTORS
GASES
HELIUM
IMPULSE APPROXIMATION
LINEAR MOMENTUM TRANSFER
MOMENTUM TRANSFER
NEUTRON DIFFRACTION
NONMETALS
PARTICLE PROPERTIES
RARE GASES
SCATTERING
SOLIDS