Kentaro Miuchi

MeV γ-ray imaging detector with micro-TPC

We propose a new imaging gamma-ray detector in the MeV region. By measuring the directions and energies of not only a scattered gamma ray but also a recoil electron, the direction of an incident gamma ray would be essentially reconstructed event by event. Furthermore, one of two measured (zenith and azimuth) angles of a recoil electron gives us an additional redundancy which enables us to reject the background events by kinematic constraints. In order to measure the track of a recoil electron, the micro Time Projection Chamber(

First underground results with NEWAGE-0.3a direction-sensitive dark matter detector

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Observation of Diffuse Cosmic and Atmospheric Gamma Rays at Balloon Altitudes with an Electron-tracking Compton Camera

-TPC) has been developed, which can measure the successive positions of the track of charged particles in a few hundred micron meter pitch. The

Detecting the wimp-wind via spin-dependent interactions

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Search for solar axions in XMASS, a large liquid-xenon detector

-TPC consists of the new type of a gas proportional chamber: micro PIxel gas Chamber (

Direction-sensitive dark matter search results in a surface laboratory

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Light WIMP search in XMASS

-PIC) which is one of wireless gas chambers and expected to be robust and stable. Using this

Development of an ASD IC for the micro pixel chamber

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First results from dark matter search experiment with LiF bolometer at Kamioka Underground Laboratory

-TPC and the Anger camera for the detection of a scattered gamma ray, we have obtained the first gamma-ray image by the full reconstruction of the direction of gamma rays event by event.

Simulation study of electron drift and gas multiplication in Micro Pixel Chamber

Abstract A direction-sensitive dark matter search experiment at Kamioka underground laboratory with the NEWAGE-0.3a detector was performed. The NEWAGE-0.3a detector is a gaseous micro-time-projection chamber filled with CF4 gas at 152 Torr. The fiducial volume and target mass are 20 × 25 × 31 cm 3 and 0.0115 kg, respectively. With an exposure of 0.524 kg days, improved spin-dependent weakly interacting massive particle (WIMP)-proton cross section limits by a direction-sensitive method were achieved including a new record of 5400 pb for 150 GeV / c 2 WIMPs. We studied the remaining background and found that ambient γ-rays contributed about one-fifth of the remaining background and radioactive contaminants inside the gas chamber contributed the rest.