Accession Number : AD0713478

Title :   EXPERIMENTAL STUDY OF THE LAMBDA TRANSITION OF LIQUID HELIUM USING FIRST SOUND ATTENUATION.

Descriptive Note : Technical rept.,

Corporate Author : CALIFORNIA UNIV LOS ANGELES DEPT OF PHYSICS

Personal Author(s) : Williams,Richard D.

Report Date : SEP 1970

Pagination or Media Count : 89

Abstract : The attenuation of first sound near the lambda point can be interpreted as being due to two phenomena: (1) a relaxation process described by Pokrovskii and Khalatnikov occurring only below the lambda point, and having a relaxation time of XiC2 where C2 is the velocity of second sound and Xi is a coherence length of magnitude 1.36 x 10 to the minus 8th power ((T sub Lambda)-T) to the minus 2/3 power cm; (2) a critical attenuation which is non-singular and symmetrical about T sub Lambda. (Author)

Descriptors :   (*LIQUEFIED GASES, *SUPERFLUIDITY), (*HELIUM, PHASE STUDIES), TRANSITION TEMPERATURE, CRYOGENICS, ATTENUATION, ULTRASONIC RADIATION, THESES

Subject Categories : Physical Chemistry
      Thermodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE