We report on results from 80 hours of livetime with the Goldstone Lunar Ultra-high energy neutrino Experiment (GLUE). The experiment searches for microwave pulses (width ≤ 10 ns) 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 up-coming ~ 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 unambiguous candidates are yet seen. We report on limits implied by this non-detection, based on new Monte Carlo estimates of the efficiency.
We conduct a search for the coherent Cherenkov radiation (from negative charge excess), induced by high energy cosmic-rays. As a medium for detecting Cherenkov radiation we use a 20 ton target of synthetic rock salt contained within a scintillation counter cosmic-ray hodoscope. Two parallel arrays of crossed bow tie antennas are put inside the salt bed and used as a detection tool. We also present preliminary results from beam tests of the approach done at SLAC.
Ultra-high Energy cosmic neutrinos will produce a detectable pulse of RF radiation when they interact in solid media. Large rock salt formations, which are highly transparent to RF radiation, may serve as the medium for detectors searching for astrophysical neutrino sources. It is possible to instrument such formations with antennas to produce a detector with tens of cubic kilometers of water-equivalent volume and a large solid angle neutrino acceptance. We review previously reported on the long attenuation length measurements for electric fields in the Hockley salt dome. We consider here several detector geometries and their sensitivities to cosmic neutrino fluxes. We also report on insights yielded by Monte Carlo studies into the scaling laws governing the design of such a detector.
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