Radio limits on an isotropic flux of >100 EeV cosmic neutrinos

Details Radio limits on an isotropic flux of >100 EeV cosmic neutrinos Radio limits on an isotropic flux of >100 EeV cosmic neutrinos

2001-02-26

arxiv.org/abs/astro-ph/0102435v1

Astronomy and Astrophysics

Astrophysics

12 pages, 7 fig., presented at the First International Workshop on Radio Detection of High Energy Particles (RADHEP 2000), Nov

Scientific paper

We report on results from about 30 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 about 22 km and linked by optical fiber. The pulses can arise from subsurface electromagnetic cascades induced by interactions of up-coming ~100 EeV neutrinos in the lunar regolith. A new triggering method implemented after the first 12 hours of livetime has significantly reduced the terrestrial interference background, and we now operate at the thermal noise level. No strong candidates are yet seen. We report on limits implied by this non-detection, based on new Monte Carlo estimates of the efficiency. We also report on preliminary analysis of smaller pulses, where some indications of non-statistical excess may be present.

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