Pomeranchuk has suggested that one might directly observe neutrino oscillations in a solar‐neutrino experiment if the oscillation wavelength were comparable to the annual earth‐sun distance variation from perihelion to aphelion, 5×106 km. We find that data from the Brookhaven solar‐neutrino experiment can be interpreted to marginally favor the neutrino‐oscillation hypothesis at the 2‐standard‐deviation level. If the effect is not a statistical fluctuation, the estimated value for Δm2= mν12−mν12∠4×10−10 eV2 is such that terrestrial tests would seem to be unfeasible.

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