Abstract
The residual polarization of theF− hyperfine state ofμ−27Al has been investigated as a function of applied transverse magnetic field strength using standard TD-μ−SR techniques. TheF− precession frequency is −0.2623(5) [theoretical value: −0.2622] times that of the free muon in the same field. The observed muon decay electron asymmetry in theF− state decreases with increasing magnetic field strength, due to initial precession in the opposite direction of theF+ state, which most muon initially populate, followed by a rapid transition to theF− state. A fit of the data to this model indicates a transition rateR=41(9)μs−1, in good agreement with theoretical predictions. This method can be used to determineR experimentally in other cases where it is too fast to be observed directly.
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