Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-10-23
Astronomy and Astrophysics
Astrophysics
Submitted for the SUSY07 proceedings, 4 pages, LaTeX, 3 eps figures
Scientific paper
Existence of GZK neutrinos (ultra high energy neutrinos) have been justified although the flux is very low. A new method is desired to use a huge mass of a detector medium to detect them. A fundamental study of radar method was carried out to measure microwave reflection from electromagnetic energy deposit by X-ray irradiation in a small rock salt sample. The reflection rate of 1x10^-6 was found at the energy deposit of 1x10^19 eV which was proportional to square of the X-ray intensity suggesting the effect to be coherent scattering. The decay time of the reflection was several seconds. This effect implies a large scale natural rock salt formation could be utilized like a bubble chamber irradiated by radio wave instead of visible light to detect GZK neutrinos.
Amano Akio
Arakawa Yoko
Chiba Masami
Chikashige Yuichi
Fujii Masatoshi
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