Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-03-22
New Astron.Rev. 48 (2004) 263-268
Astronomy and Astrophysics
Astrophysics
7 pages, 6 figures Proceedings of the "Astronomy With Radioactives IV and Filling The Sensitivity Gap In MEV Astronomy", May 2
Scientific paper
10.1016/j.newar.2003.11.038
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.
Kubo Hidetoshi
Miuchi Kentaro
Nagayoshi Tsutomu
Orito Reiko
Takada Atsushi
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