Negative muon precession in nuclei with spin

Polarized negative muons were stopped in various materials containing nuclei with nonzero spin. The TF-SR precession signal of theF⁺ hyperfine state (frequencyv₊ > 0) was pronounced for^–Li and^–Be, faint for^–Cl (in NiCl₂), and undetectable for^–F (in CaF₂ or NiF₂) and^–P. TheF^– signal (frequencyv_– < 0) was observed clearly for^–Be,^–Al and^–Na, marginally for^–K,^–V and^–Nb, and not at all for^–Ga (at 4 kOe) or^–Co (ferrromagnetic, zero field). In the heavier elements theF^– signal is fed by transitions from theF⁺ to theF^– state at a rateR, as long asR(v₊ –v_–). [See separate paper on^–Al in these Proceedings, p. 879.]I am grateful to Alex Schenck and Bruce Patterson for the loan of equipment and samples, to Fred Gygax for helping set up the apparatus, to Jun Imazato for help with the experiment, and to Toshi Yamazaki and Tak Suzuki for valuable comments. I am also indebted to SIN for several weeks of free^– beam time and to SIN, BOOM, and the University of Tokyo for free time on their VAX computers, which were kept busy for several months in the analysis.