Searches for muonium atoms in aluminum, copper, zinc, and carbon
Grebinnik V.G., Gurevich I.I., Zhukov V.A., Ivanter I.G., Manych A.P., Nikol'skii B.A., Selivanov V.I., Suetin V.A.
No temperature dependence of the μ+-meson precession was observed, with accuracy -0.03%, in Al, Cu, Zn, and С at Τ = 4 to 90°K. It follows from these data that the frequencies ω0 of the hyperfine splitting of the muonium atom (μ+ε ") in these substances are ω0< Ю-4 (co0)Vac where (co0)vac is the frequency of the hyperfine splitting of muonium in vacuum. So small a value of ω0 in the investigated substances can be interpreted as the absence of an orbitally bound paramagnetic state of (μ+ε ~).
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 in these substances are ω<sub>0</sub>< Ю<sup>-4</sup> (co<b><sub>0</sub>)<sub>V</sub>a<sub>c</sub> </b>where (co<sub>0</sub>)<sub>vac</sub> is the frequency of the hyperfine splitting of muonium in vacuum. So small a value of ω<sub>0</sub> in the investigated substances can be interpreted as the absence of an orbitally bound paramagnetic state of (μ<sup>+</sup>ε ~).")