TABLE I.Results of the polarization measurements. Moderator Asymmetry(%) Polarization P(%) Polarization P'(%)d Ar 18.24±0.56 87.0±2.8 91.7±7.5 Krs 16.81±4.30 80±20 85±23 Alb 19.89±1.50 94.8±7.2 100 a Very slow muons (E~10 ev). b Muons with keV energy. c Normalized to asymmetry of surface muons in MCP. d Normalized to asymmetry of keV muons emitted from the Al moderator