β Scribed by Gary A. Williams; Richard E. Packard
No coin nor oath required. For personal study only.
The trapping lifetime and mobility of positive and negative ions on vortex lines
m He-He mtxtures have been measured m the temperature range between O. 1 and 1.3 K. The binding energy of the positive ion is found to be reduced by the 3He, and the mobility of both ion species is lowered, providing evidence that the 3He condenses at the vortex core. The negative ion trapping lifetime is smaller than that of the positive ion in the region 0.3-0.5 K, indicating that the bubble structure may be modified by the presence of the condensed 3He. At 0.3 K the negative ion lifetime increases sharply, in qualitative agreement with theoretical models predicting an increase in the bubble radius at that temperature.
π SIMILAR VOLUMES
In rotating 3He-B a large energy barrier leads to a well-defined critical rotation velocity f4(T,p) for
Helium-3 nuclear spin relaxation times T1, T2, and Tip have been measured for 3He-4He solid mixtures at the exchange plateau region (~ O. 5 K). The 3He concentrations x3 of the samples were 7.2, 2.9, 1.8, 1.4, 0.67, 0.65, and 0.22 %, and their molar volumes varied between 19.9 and 20.9 cm3 /mole in