[en] Search experiments carried out in the flux of reactor antineutrinos at the Rovno nuclear power plant are described. In the present experiments, an integrating method is used and the detector is a cesium iodide scintillating crystal with a mass of 9.3 kg. Limits are found to the specific antineutrino energy loss in matter, the production of axions in the reactor, the probability of decay, and the effect of the antineutrino flux on the probability of beta(+) and beta(-) decay. 9 references