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3 March 2003 Microwave properties of rock salt and limestone for detection of ultra-high energy neutrinos
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Rock salt and limestone are studied to determine their suitability for use as a radio wave transmission medium in an ultra high energy (UHE) cosmic neutrino detector. Sensible radio-wave would be emitted the Askar'yan effect (coherent Cherenkov radiation from negative excess charges in an electromagnetic shower) in the interaction of the UHE neutrinos with the high-density medium. If the attenuation length in the material is large, relatively small number of radio-wave detector could detect the interactions happened in the massive material. We have been measured the complex permittivity of the rock salts and limestones by a free space method and a perturbational resonator method at 9.4GHz. In this paper, we show the data for new limestone samples from Mt. Jura in France at 9.4GHz and the results of preliminarily measurements of the frequency dependence at 7-12GHz .The measured value of the radio-wave attenuation lengths of the rock salt sample from the Asse mine in Germany is longer than 3.3m at 9.4 GHz and then under the assumption of constant tanδ with respect to frequency, we estimate it by extrapolation to be longer than 310 m at 100 MHz. The results show that there is a possibility to utilize natural massive deposits such as rock salt for a UHE neutrino detector.
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Toshio Kamijo M.D. and Masami Chiba "Microwave properties of rock salt and limestone for detection of ultra-high energy neutrinos", Proc. SPIE 4858, Particle Astrophysics Instrumentation, (3 March 2003);

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