We report the observation of two types of multiple spin echoes in liquid ³He below 100 mK. It is shown that these are generated by (i) Fermi-liquid interaction effects at the transition to the collisionless regime at low T, and (ii) the dipolar demagnetizing field in the regime of slow spin diffusion at higher temperatures. A perturbative solution of the appropriately generalized Bloch equations accounts for the qualitative features observed in experiment.
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Einzel et al. (1984) studied this question.
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