No abstract

A search is described for mixing of muonium ( p t e -) and antimuonium (p-e'). Thermal muonium was produced by stopping muons in a SiOz powder target. As a conversion signature, a p-from antimuonium would create l S 4~a in an adjacent tungsten foil. The surface layer of the sample was chemically extracted and counted in a low-background germanium spectrometer; no conversion events were observed. The resulting upper limit on the probability that a muonium atom spontaneously converts to antimuonium is 2.1 x l o b 6 (90% confidence). This corresponds to a limit of 0 . 2 9 G~ on the effective four-fermion coupling constant between muonium and antimuonium.

No abstract

No abstract

No abstract