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We report on the initial results from a measurement of the antineutrino flux and spectrum at a distance of about 800 m from the three reactors of the Palo Verde Nuclear Generating Station using a segmented gadolinium-loaded scintillation detector. We find that the antineutrino flux agrees with that predicted in the absence of oscillations excluding at 90% C. L. {}₄-{}ₗ oscillations with m^2>1. 1210^-3eV^2 for maximal mixing and sin^22>0. 21 for large m^2. Our results support the conclusion that the atmospheric neutrino oscillations observed by Super-Kamiokande do not involve ₄.
Boehm et al. (Mon,) studied this question.