Experimental Limit on the Cosmic Diffuse Ultra-high Energy Neutrino Flux

Abstract

We report results from 120 hours of livetime with the Goldstone Lunar Ultra-high energy neutrino Experiment (GLUE). The experiment searches for <10 ns microwave pulses from the lunar regolith, appearing in coincidence at two large radio telescopes separated by 22 km and linked by optical fiber. Such pulses would arise from subsurface electromagnetic cascades induced by interactions of >= 100 EeV neutrinos in the lunar regolith. No candidates are yet seen, and the implied limits constrain several current models for ultra-high energy neutrino fluxes.

4 pages, 4 figures, revtex4 style. New intro section, Fig. 2, Fig 4; in final PRL review

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