Dynamic form factor of liquid /sup 4/He at intermediate momentum transfer

Journal Article · Sat Oct 01 04:00:00 EDT 1988 · J. Low Temp. Phys.; (United States)

DOI:https://doi.org/10.1007/BF00681742· OSTI ID:6066010

Stirling, W G; Talbot, E.F. Tanatar, B.; Glyde, H R

Measurements of the inelastic neutron scattering from liquid /sup 4/He at T = 1.2 K in the range of wavevector transfer 3 less than or equal to Q less than or equal to 12 /angstrom/ /sup /minus/1/ have been performed to verify the oscillations in the peak position and the width of the scattering function with Q observed by Cowley and Woods and by Martel et al. The authors confirm these oscillations and extend the measurements to show that the oscillations in the width continue up to Q approx. 12 /angstrom/ /sup /minus/1/ while oscillations in the peak position, which have a much smaller amplitude, could be observed with confidence up to Q approx. 8 /angstrom//sup /minus/1/ only. They also present a straightforward RPA calculation of the dynamic form factor S(Q, ..omega..), beginning from the pair interatomic potential, to see how well the observed S(Q, ..omega..) can be described and to investigate the origin of the oscillations. The observed S(Q, ..omega..) is quite well reproduced and the oscillations in the width and peak position of S(Q, ..omega..) are seen to originate from oscillations in the interaction in the RPA which they have approximated as the /sup 4/He-/sup 4/He scattering amplitude calculated from v(r). While the present calculation is quite different from the model proposed previously by Martel et al., the physical origin of the oscillations in S(Q, ..omega..) is the same, namely oscillations in the /sup 4/He-/sup 4/He atom scattering amplitude.

• Research Organization: Univ. of Delaware, Newark (USA)
• OSTI ID: 6066010
• Journal Information: J. Low Temp. Phys.; (United States), Journal Name: J. Low Temp. Phys.; (United States) Vol. 73:1-2; ISSN JLTPA
• Country of Publication: United States
• Language: English

Related Subjects

640450* -- Fluid Physics-- Superfluidity
653003 -- Nuclear Theory-- Nuclear Reactions & Scattering
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
AMPLITUDES
BARYON REACTIONS
CROSS SECTIONS
ENERGY SPECTRA
EVEN-EVEN NUCLEI
FORM FACTORS
FUNCTIONS
GAUSS FUNCTION
HADRON REACTIONS
HELIUM 4
HELIUM 4 TARGET
HELIUM ISOTOPES
INELASTIC SCATTERING
ISOTOPES
LIGHT NUCLEI
LINE WIDTHS
MOMENTUM TRANSFER
NEUTRON REACTIONS
NEUTRON SPECTRA
NUCLEAR REACTIONS
NUCLEI
NUCLEON REACTIONS
OSCILLATIONS
PARTICLE PROPERTIES
RANDOM PHASE APPROXIMATION
SCATTERING
SCATTERING AMPLITUDES
SPECTRA
STABLE ISOTOPES
SUPERFLUIDITY
TARGETS