Orateur
Dr
Masami Chiba
(Tokyo Metropolitan University)
Description
We measured radio wave reflection from rock salt irradiated by a 2MeV-electron beam in a wave guide filled with rock salt. We found that the reflected power of the radio wave was proportional to square of the electron-beam current with constant electron energy of 2MeV, simultaneously temperature of the rock salt was measured to be proportional to the electron beam current. It is explained that the reflected power is proportional to square of refractive index of heated part of the rock salt (see Fresnel equations) and the refractive index of the rock salt lineally increases with the temperature (see James C. Owens, Phys. Rev. 118(1969)1228).
Summary
We found radio wave reflection from rock salt irradiated by an electron beam. The effect would be applicable to detect ultra-high-energy neutrinos in a huge rock salt dome. By a radar with peak power of 1GW at 10MHz, we could detect them with the rage of 0.5km to 3km for 10^17eV to 10^19eV GZK neutrinos, respectively, taking into account the attenuation length of the radio wave. We expect to measure around 10 GZK neutrinos/year by the radar system which has a several surface antennas emitting radio wave downward and receiving upward, respectively. They are placed on a floor of an excavated space of a rock salt dome.
Author
Dr
Masami Chiba
(Tokyo Metropolitan University)
Co-auteurs
Dr
Fumiaki Yabuki
(Tokyo Metropolitan University)
M.
Hidetoshi Akiyama
(Seikei University)
Mlle
Hiromi Kataoka
(Seikei University)
Prof.
Masatoshi Fujii
(Shimane University)
Prof.
Michiaki Utsumi
(Tokai University)
Prof.
Osamu Yasuda
(Tokyo Metropolitan University)
Prof.
Tadashi Kon
(Seikei University)
M.
Toshio Kamijo
(Tokyo Metropolitan University)
Prof.
Yuichi Chikashige
(Seikei University)
M.
Yutaka Shimiz
(Seikei University)
