Zero sound mode in normal liquid 3He.
Inelastic x-ray scattering has been utilized to study the elementary excitations of normal liquid 3He at the temperature T=1.10+/-0.05 K and saturated vapor pressure in the wave vector range 0.15<or=Q<or=3.15 A(-10. The present data provide direct information on the zero-sound mode in the mesoscopic wave vector range where it was expected to decay into particle-hole excitations. The obtained results show no evidence of such a decay: the zero-sound mode remains well defined in the whole explored wave number range, thus witnessing a continuous transition of the atom dynamics from the collective to the single particle regime similarly to what is usually found in simple liquids.
Albergamo
F
F
European Synchrotron Radiation Facility, Boîte Postale 220, F-38043 Grenoble Cedex, France.
Verbeni
R
R
Huotari
S
S
Vankó
G
G
Monaco
G
G