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

  • 8 October 2003
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. Triggering on a timing coincidence between the two telescopes significantly reduces the terrestrial interference background, allowing operation at the thermal noise level. No candidates are yet seen. We report on limits implied by this non-detection, based on Monte Carlo estimates of the efficiency.

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