RING VORTEX DESTABILIZATION IN SUPERSATURATED HE-3-HE-4 LIQUID-MIXTURES AT LOW-TEMPERATURES

The effect of ring vortices on the destabilization of supersaturated l iquid helium mixtures at very low temperatures is investigated as a fu nction of pressure. We have found that large ring vortices trigger the segregation of He-3 at smaller values of rite concentration than smal l ring vortices. Our calculations indicate that the existence of ring vortices in the mixture is a possible mechanism to understand the rath er small degree of critical supersaturation found in the experiments.