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• W2296973605 abstract "For improving an observational sensitivity of MeV gamma-ray astronomy, a new type of the Compton telescope with a fine Compton recoil-electron tracking is proposed. Performances of a prototype telescope are summarized, and future visions are shown. © 2005 Department of Physics, Kyoto University The medium energy gamma-ray band is particularly important for a wide variety of high-energy astrophysical problems, specifically those involving nuclear, non-thermal, and relativistic processes. However, the energy band between 0.1 MeV to 100 MeV has been poorly explored due to the difficulty of the detection and the imaging for such photons. Although the instrument sensitivities have been improved by about a factor of 100 from the first balloon-borne gamma-ray observations in the 1960s to the COMPTON Gamma-ray Observatory (GRO), this is a very modest sensitivity gain when compared to the capabilities achieved in other wavelength bands. Although the COMPTEL (0.75 ~30 MeV) aboard GRO performed very well as a first Compton telescope, it suffered severely from the large backgrounds, the poor angular resolution, and the complicated image decodings. An improvement of MeV gamma-ray observation technique is a matter of urgency. In order to overcome the problem found in the former Compton telescopes, we propose a new Compton telescope with a fine tracking of the Compton recoil-electrons [1][2]. In this detector, both the energy and direction of the Compton recoil electron are precisely measured by the TPC, while those of the Compton scattered gamma ray are also measured by the scintillation camera. This detector realizes a full tracing of the Compton scattering process, including the direction of a recoil electron with low energy, which is not measured so far with former Compton telescopes. By measuring the direction of the recoil-electron, the incident gamma ray is determined only on a small segment of the Compton event circle. Furthermore, measuring the recoil electron direction gives us an additional redundancy that enables us to reject almost all of the background events by the kinematical constraints. For demonstrating these concepts, we have developed a prototype telescope. For a precise measurement of the Compton recoil electron, we have originally developed a gaseous TPC (μ-TPC) with a volume of 10x10x8 cm using a micro-pattern device, Micro Pixel Chamber (μ -PIC) and a capillary plate as an intermediate gas multiplier. Achieved three-dimensional position resolution of the μ-TPC is σ~ 440 μm at 50 MHz sampling. The μ -TPC operated stably with a high gain of ~30000 over two months. For a fine tracking of the Compton scattered gamma ray, we have also originally developed a position-sensitive scintillation camera enclosing the μ -TPC. We have developed an Anger camera, which consists of a large plate of NaI(Tl) scintillator (37x37x2.5 cm) and an array of 2 inch square 36-PMTs. The achieved energy and position resolutions were 7.4% and 11mm (FWHM) at 662 keV, respectively. We have also developed a compact pixellated scintillation camera, which consists of a GSO 6mm-picth pixel-array and Multi-Anode Photomultiplier Tubes (MAPMTs) with a resistor-chain readout method. The achieved energy resolution was 9.8% at 662 keV. By combining the μ-TPC and the scintillation camera, we have developed a prototype electron tracking Compton telescope. Using sub-MeV radioisotope sources, we have succeeded in reconstructing the gamma-ray image with high angular resolutions. Compared with a classical Compton imaging method, the advantages of the electron-tracking method have been demonstrated. In this talk, performances of the gaseous electron-tracking Compton gamma-ray telescope are reported. The future prospects for astrophysical experiments are presented. References [1] R.Orito et al, NIM A 513(2003) 408-412 [2] R.Orito et al, NIM A 525(2004) 107-113" @default.
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• W2296973605 date "2005-03-23" @default.
• W2296973605 modified "2023-09-23" @default.
• W2296973605 title "Development of an electron-tracking Compton telescope with a gaseous time projection chamber and a scintillation camera for application to MeV gamma-ray astrophysics" @default.
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