LIMITATIONS ON THE CHARACTERISTICS OF NEUTRINO OSCILLATIONS

New results are reported on the observation of inverse beta decay of t he proton. The data were obtained in an underground laboratory near th e nuclear reactors of a Krasnoyarsk group of enterprises. The new resu lts add substantially to the results available previously, because of the particular experimental conditions, which involved a stepped shutd own of two of the three reactors. The cross section for inverse beta d ecay of the proton has been determined: sigma(expt)(vp) = (6.26 +/- 0. 26) x 10(-43) cm2/div. Limitations are found on characteristics of the neutrino oscillations: DELTAm1,2(2) less-than-or-equal-to 7.5 X 10(-3 ) eV2 for sin(2)2theta = 1 and sin(2)2theta less-than-or-equal-to 0.15 for DELTAm1,2(2) greater-than-or-equal-to 5.0 X 10(-2) eV2.