24 July 2014 MeV gamma-ray Compton camera using a gaseous electron tracker for background-suppressed observation
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Abstract
As a next generation MeV gamma-ray telescope, we develop an electron-tracking Compton camera (ETCC) that consists of a gaseous electron tracker surrounded by pixel scintillator arrays. The tracks of the Compton-recoil electron measured by the tracker restrict the incident gamma-ray direction to an arc region on the sky and reject background by using the energy loss rate dE/dx and a Compton-kinematics test. In 2013, we constructed, for a balloon experiment, a 30-cm-cubic ETCC with an effective area of ~1 cm2 for detecting sub-MeV gamma rays (5 σ detection of the Crab Nebula for 4 h). In future work, we will extend this ETCC to an effective area of ~10 cm2. In the present paper, we report the performance of the current ETCC.
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A. Takada, A. Takada, T. Tanimori, T. Tanimori, H. Kubo, H. Kubo, J. D. Parker, J. D. Parker, T. Mizumoto, T. Mizumoto, Y. Mizumura, Y. Mizumura, T. Sawano, T. Sawano, K. Nakamura, K. Nakamura, Y. Matsuoka, Y. Matsuoka, S. Komura, S. Komura, S. Nakamura, S. Nakamura, M. Oda, M. Oda, K. Miuchi, K. Miuchi, S. Kurosawa, S. Kurosawa, } "MeV gamma-ray Compton camera using a gaseous electron tracker for background-suppressed observation", Proc. SPIE 9144, Space Telescopes and Instrumentation 2014: Ultraviolet to Gamma Ray, 91440G (24 July 2014); doi: 10.1117/12.2055627; https://doi.org/10.1117/12.2055627
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