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It has been recently shown that excess events observed by the LSND andMiniBooNE neutrino experiments could be interpreted as a signal from theradiative decay of a heavy sterile neutrino \nu_h produced in \nu_\mu neutralcurrent-like interactions. If the \nu_h exist, it would be also produced by the\nu_\mu beam from the CERN SPS in the neutrino beam line shielding. The \nu_h'swould penetrate the shielding and be observed through the decay \nu_h -> \nu\gamma, followed by the photon conversion into e+e- pair in the active targetof the NOMAD detector. The \nu_h's could be also produced in the iron of themagnetic spectrometer of the CHORUS detector, located just in front of NOMAD.Considering these two sources of \nu_h's we set new constraints on \nu_hproperties and exclude part of the LSND/MiniBooNE \nu_h parameter space usingbounds on single photons production in neutrino reactions recently reported bythe NOMAD collaboration. We find that broad bands in the parameter space arestill open for more sensitive searches for the \nu_h in future neutrinoexperiments.

New limits on radiative sterile neutrino decays from a search for single photons in neutrino interactions