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Because of the disaster of Fukushima No.1 nuclear power plant in 2011, a large amount of radioactive substance (including 90Sr and 137Cs) was released into the Japanese coast of the Pacific Ocean. 90Sr can be more dangerous than 137Cs. Since 90Sr does not emit γ rays, it is very difficult to measure its radioactivity. We have made threshold-type Cherenkov counter using silica aerogel with a refractive...
Usual TOP (time of propagation) detectors have several disadvantages. We propose a new TOP detector which overcomes those by using clear fibers (these have high transparency than general optical fibers). We performed Monte Carlo simulations with Geant4 and tested a prototype with e+ of 0.7 to 1.0 GeV at SPring8 BR33LEP beam line. We propose this detector to E-36 experiment at J-PARC.
We are developing a multi-purpose aerogel Cherenkov counter (M-ACC). M-ACC is a particle identification (PID) device which works in a narrow space and can cover large area with arbitrary shapes. It can also function in a magnetic field. M-ACC has a light guide comprising wavelength shifting fibers (WLSF), and its application is π/Κ identification in high-energy physics experiments, β-ray detection...
A novel triangular resonator with a long evanescent field around the critical angle has been analysed and demonstrated for the first time. The sensitivity of the resonance shift used for changing the refractive index of 1 ?? 10-5 at the incidence angle of 18?? is 1.04 ?? 10-7 nm/RIU for transverse magnetic polarised light. An extinction ratio of 6 dB was observed near 1550 nm, where the incidence...
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