We report on a search for decays of long-lived penetrating neutral particles in the neutrino beam at Fermilab. We find an event rate consistent with background which corresponds to a fraction (7±{}5)×{}10^-3 of ν_μ(ν_μ) scattering in liquid scintillator. This result poses an apparent contradiction to the observations of Krishnaswamy et al. in the Kolar Gold Mines.
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Benvenuti et al. (1975) studied this question.
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