Dispersion of the Velocity of Sound in Xenon in the Critical Region
1970; American Physical Society; Volume: 25; Issue: 17 Linguagem: Inglês
10.1103/physrevlett.25.1165
ISSN1092-0145
AutoresH. Z. Cummins, Harry L. Swinney,
Tópico(s)Cold Atom Physics and Bose-Einstein Condensates
ResumoThe sound velocity in xenon on the critical isochore was determined in Brillouin scattering measurements at scattering angles of 40\ifmmode^\circ\else\textdegree\fi{} and 90\ifmmode^\circ\else\textdegree\fi{}. The sound dispersion calculated from our data, ultrasonic data, and other Brillouin data agrees with the Kawasaki theory for a particular choice of parameters, but the dispersion in the Brillouin velocities is 2 to 3 times smaller than the theory predicts when values obtained for the parameters from other experiments are used.
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