Velocities of Sound in Polycrystalline Neon

Abstract
The longitudinal and transverse velocities of sound have been measured in polycrystalline specimens of neon from 18 to 24.5 K by ultrasonic pulse-echo techniques. The results are compared to values at lower temperatures obtained previously by Batchelder and co-workers and by Bezuglyi and co-workers. From these results the isothermal compressibility has been calculated. Comparisons made with various model calculations show the data to be in best agreement with the improved self-consistent model calculations of Goldman, Horton, and Klein.