Precision sound-velocity measurements in He II
Joseph E. HeisermanDepartment of Physics, University of California, Los Angeles, California 90024J. P. HullinDepartment of Physics, University of California, Los Angeles, California 90024J. D. MaynardDepartment of Physics, University of California, Los Angeles, California 90024I. RudnickDepartment of Physics, University of California, Los Angeles, California 90024
1976en
ABI
Abstract
Acoustic resonators were used to measure simultaneously the velocities of first, second, and fourth sound in He II to a typical precision of 0.2%. Data were taken at temperatures from 1.2 K to the $\ensuremath{\lambda}$ line in 50-mK steps, and at pressures from the saturated vapor pressure to the melting curve in 1-bar steps. Temperature and pressure were determined to better than 0.1%. Fourth sound was measured in a coarse (\ensuremath{\sim} 1-\ensuremath{\mu}m) and fine (\ensuremath{\sim} 90-\AA{}) packed powder. Smoothed and raw data values are tabulated for more than 1500 data points.
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