An experiment was performed in order to detect cold fusion in an electrochemical set-up similar to that described by Fleischmannet al. The detection of gamma-rays from deuteron formation was made with a NaI(Tl) scintillator. Upper bounds for the neutron production rate of 0.53 c/s and 0.23 c/s for the stationary and the transient processes, respectively, were determined.Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas