Abstract
Measurements of the spin diffusion coefficientD and NMR relaxation timesT1 andT2 are reported for dilute solutions of3He in solid4He at two molar volumes, 20.95 and 20.7 cm3. The weakly interacting impuriton model, for whichD−1 is proportional to impurity concentration, is observed only at fractional impurity concentrationx3 below 3 × 10−4. Forx3 around 10−3,T1 andT2 are controlled by the formation and breakup of3He2 molecules.
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