
pmid: 10035925
Searches have been performed for neutrinoless muon-electron conversion and muon-positron conversion using a time projection chamber. An upper limit on the branching ratio for the coherent reaction R(..mu../sup -/ +Ti..-->..e/sup -/+Ti) ..e/sup +/+Ca no events were observed for positron momenta p>96 MeV/c leading to an upper limit on the partial branching ratio relative to ordinary muon capture GAMMA/sub p//sub >//sub 96/(..mu../sup -/+Ti..-->..e/sup +/ +Ca)/GAMMA(..mu../sup -/+Ti..-->..capture) ..e/sup +/+Ca)/GAMMA(..mu../sup -/ +Ti..-->..capture)<1.7 x 10/sup -10/ (90% C.L.).
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