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DENSITY MEASUREMENTS IN SOLID HE4
YALE UNIV NEW HAVEN CT
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The measurements were made on solid He4 in the region of the gamma body-centered cubic phase discovered by Vignos and Fairbank. Points were taken at constant temperature for six temperatures between 1.45K and 1.73K. The results for pressures near the melting and transition curves are shown. The lower density gamma phase is clearly seen as the first step in the curve. The measured volume changes for melting and for the solid transition are listed. The volume changes for melting agree with those of Grilly and Mills to within 2- 3, while the solid transition volume changes are slightly higher than theirs but in agreement within the experimental error. Their data indicated a minimum in the solid transition volume change near the center of the gamma phase. No such effect is seen here.
APPROVED FOR PUBLIC RELEASE