Abstract
In a longitudinalμ+SR experiment on a high-purityα-Fe single crystal sphere magnetically saturated in a 〈 111 〉 direction damped oscillations (wiggles) were observed in a temperature range 30 mK to 600 mK and in a certain regime of applied magnetic fieldsBappl. Meassurements of the wiggle frequency as a function ofBappl give us directly the Fermi fieldBFermi=(−1.13±0.02)T and the dipolar magnetic field ¦Bdip∥¦=(0.66±0.03)T.Bdip∥ was used to determine the prefactor in the Arrhenius law obeyed by theμ+ hopping rate between 100 K and 1000 K. A comparision with the corresponding values for protons and deuterons suggests diffusion via the adiabatic mechanism.
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