Excitations in liquid [sup 4]He beyond the roton

Conference · Thu Oct 01 04:00:00 EDT 1992 · Journal of Low Temperature Physics; (United States)

OSTI ID:6911910

Faak, B; Regnault, L P ^[1]; Bossy, J ^[2]

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1. CENG, Grenoble (France)
2. Inst. Laue-Langevin, Grenoble (France)

The dynamic structure factors S(Q,E) for liquid [sup 4]He at saturated vapor pressure was measured by inelastic neutron scattering for wave vectors Q between 1.9 and 2.8 [angstrom][sup [minus]1]. The temperature dependence is studied for Q = 2.3 [angstrom][sup [minus]1]. The sharp phonon-roton peak gradually disappears with increasing temperature, while the scattering at higher energies is nearly temperature independent. The experimental results are compared with the density-quasiparticle interpretation introduced by Glyde and Griffin, and with a model describing the hybridization with the multiparticle excitations.

• OSTI ID: 6911910
• Report Number(s): CONF-9206305--Pt.1
• Conference Information: Journal Name: Journal of Low Temperature Physics; (United States) Journal Volume: 89:1-2
• Country of Publication: United States
• Language: English

Related Subjects

665430* -- Other Topics in Quantum Fluids & Solids-- (1992-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BOSE-EINSTEIN CONDENSATION
COHERENT SCATTERING
DIFFRACTION
EVEN-EVEN NUCLEI
HELIUM 4
HELIUM ISOTOPES
HYBRIDIZATION
INELASTIC SCATTERING
ISOTOPES
LIGHT NUCLEI
MEASURING METHODS
NEUTRON DIFFRACTION
NUCLEI
QUASI PARTICLES
ROTONS
SCATTERING
STABLE ISOTOPES
STRUCTURE FACTORS
TEMPERATURE DEPENDENCE