Abstract
Very dilute3He-4He solutions provide a model system for the study of the effects of magnetic polarisation. It was proposed by the Lancaster group1 that a “pumping” effect of3He should be observed under appropriate conditions in these solutions. In a strong magnetic field gradient, the3He should be pumped from the low field region towards the high field region, in which the3He is polarised. We have now observed this effect in 0.1% and 0.06% solutions, using a vibrating wire resonator in the low field region as the concentration indicator. The concentration change of a few percent under our present experimental conditions (9T maximum field, 10 mK) is of the expected magnitude so that development of the technique can now be considered.
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