DISTINCTIVE FIELD-DEPENDENCE OF THE LONGITUDINAL MUON POLARIZATION FOR MU-ASTERISK IN POLYCRYSTALLINE SILICON

A distinctive longitudinal magnetic field dependence of the muon polar ization for anomalous muonium in polycrystalline semiconductor targets has been predicted. The polarization exhibits a cusp, i.e., a discont inuous jump in the slope from negative to positive. Measurements of th e longitudinal polarization for polycrystalline silicon in fields up t o 0.5 T, and temperatures 53 and 200 K have been made at LAMPF. A cusp in the field dependence indeed occurs at 0.345 T, in excellent agreem ent with the prediction. No cusp is observed at 200 K because Mu has been thermally ionized.