Elsevier

Nuclear Physics A

Volume 377, Issues 2–3, 22–29 March 1982, Pages 406-440
Nuclear Physics A

A search for muon-electron and muon-positron conversion in sulfur

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Abstract

An experiment to search for the neutrinoless conversion of a muon into an electron or a positron in the processes μ + 32S → e + 32S and μ + 32S → e+ + 32Si has been carried out at SIN. No evidence for the occurrence of these conversion processes has been found. The resulting new upper limits (under certain assumptions about coherence), relative to ordinary muon capture, are 7 × 10−11 (90% CL) for μ → e conversion and 9 × 10−10 (90% CL) for μ → e+ conversion. The measured momentum spectra of the electrons and positrons are compatible with the background spectra expected from bound muon decay and radiative muon capture.

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    Present address: Los Alamos National Laboratory, Los Alamos, NM 87545, USA.

    ∗∗

    Institut für Experimentalphysik V, Universität Dortmund, D-4600 Dortmund, Germany.

    ∗∗∗

    CERN-ETHZ, CH-1211 Genève 23, Switzerland.

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