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T. Kamae, Y. Fukazawa, N. Iyomoto, H. Kaneda, G. Kawaguchi, M. Kokubun, A. Kubota, N. Isobe, K. Makishima, Y. Matsumoto, K. Matsuzaki, K. Nakazawa, H. Obayashi, T. Ohnishi, M. Sugiho, M. Tanaka, M. Tashiro, Y. Terada (Dept. of Physics, Univ. of Tokyo), J. Kataoka, S. Kubo, T. Murakami, N. Ota, H. Ozawa, M. Sugizaki, T. Takahashi, T. Tamura, C. Tanihata, K. Yamaoka, Y. Uchiyama (Inst. Space Astronautical Science (ISAS)), M. Nomachi (Research Center for Nuclear Phys., Osaka Univ.), A. Yoshida (Inst. of Phys. Chem. Research (RIKEN)), H. Ikeda (High Energy Accel. Research Org. (KEK)), T. Ohsugi, S. Yoshida (Dept. of Physics, Hiroshima Univ.), Astro-E Hard X-ray Detector Team
Astro-E HXD consists of 16 well-type GSO/BGO phoswich counters with imbedded thick silicon PIN diodes, 20 BGO anti-coincidence counters, analog electronic circuitry for signal amplification and filtering, and data acquisition and control electronics. The PIN diodes record hard X-rays in the lower energy range (~10 - 50~keV) and the well-type phoswich counters in the higher energy range (~40 - 600~keV). The anti-counters serve to reduce background and also as a monitor for \gamma-ray bursts and X-ray transiens. The HXD is characterized by a wide energy range coverage (10--600 keV), a collimated narrow field of view (~0.\circ 5 up to 200~keV, ~4.\circ 5 above 200~keV) and a very low background of ~(1-5) \times 10-5 cm-2 s-1 keV-1. We expect the HXD to become the most sensitive cosmic hard X-ray detector ever put into orbit.