Abstract
For several years, the KARMEN experiment was reporting an anomalous signal which was interpreted as a possible existence of heavy sterile neutrinos. The NOMAD experiment has the capability to search for such an isosinglet neutrino. It is assumed that the (ν s ) couples to the ν τ produced in the SPS neutrino beam at CERN. Analysis of NOMAD data leads to a single candidate event, compatible with the background expectations. This allows a limit to be set for the first time on the mixing strength between sterile and tau neutrinos, in the mass range 10 to 190 MeV.
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