MAGNETIC-FIELD DEPENDENT TRANSVERSE SPIN-DIFFUSION CONSTANT IN HE-3-HE-4 SOLUTIONS

The transverse spin diffusion constant of He-3- He-4 solutions has bee n measured by pulsed nmr in magnetic fields of 2.18T and 8.8T for He-3 concentrations of 0.5%, 1.0% and 3.8%. For the higher concentrations the diffusion constant at 8.8T is smaller than at 2.18T for the lowest temperatures used. The effect is largest for the 3.8% solution (a red uction by 1.7 at 15mK), but is too small to be measurable for the 0.5% solution. These results are compared to measurements of Candela et al . for pure He-3, and to the theory of Jeon and Mullin.