MeV Gamma-Ray Imaging Detector with micro-TPC

Abstract

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($\mu$-TPC) has been developed, which can measure the successive positions of the track of charged particles in a few hundred micron meter pitch. The $\mu$-TPC consists of the new type of a gas proportional chamber: micro PIxel gas Chamber ($\mu$-PIC) which is one of wireless gas chambers and expected to be robust and stable. Using this $\mu$-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.

7 pages, 6 figures Proceedings of the "Astronomy With Radioactives IV and Filling The Sensitivity Gap In MEV Astronomy", May 26-30, 2003 Seeon, Bavaria, Germany

References in corpus (4)

• The first COMPTEL Source Catalogue
• Development of a time projection chamber with micro pixel electrodes
• Performance of the TPC with Micro Pixel Chamber Readout: micro-TPC
• Performance of large area Micro Pixel Chamber

Cited by in corpus (12)

• Observation of Diffuse Cosmic and Atmospheric Gamma Rays at Balloon Altitudes with an Electron-tracking Compton Camera
• Gamma-Ray Burst Polarimeter - GAP - aboard the Small Solar Power Sail Demonstrator IKAROS
• An Electron-Tracking Compton Telescope for a Survey of the Deep Universe by MeV gamma-rays
• New readout and data-acquisition system in an electron-tracking Compton camera for MeV gamma-ray astronomy (SMILE-II)
• First observation of MeV gamma-ray universe with bijective imaging spectroscopy using the Electron-Tracking Compton Telescope aboard SMILE-2+
• Studies of the performance of different front-end systems for flat-panel multi-anode PMTs with CsI(Tl) scintillator arrays
• Performance of a Time-Projection-Chamber with a Large-Area Micro-Pixel-Chamber Readout
• Imaging Polarimeter for a Sub-MeV Gamma-Ray All-Sky Survey using an Electron-Tracking Compton Camera
• Reconstruction of multiple Compton scattering events in MeV gamma-ray Compton telescopes towards GRAMS: the physics-based probabilistic model
• Compton Telescopes for Gamma-ray Astrophysics
• Time projection chambers for gamma-ray astronomy
• Background contributions in the electron-tracking Compton camera onboard SMILE-2+