TY - JOUR
T1 - Design and performance of the soft gamma-ray detector for the NeXT mission
AU - Tajima, H.
AU - Kamae, T.
AU - Madejski, G.
AU - Mitani, T.
AU - Nakazawa, K.
AU - Tanaka, T.
AU - Takahashi, T.
AU - Watanabe, S.
AU - Fukazawa, Y.
AU - Ikagawa, T.
AU - Kataoka, J.
AU - Kokubun, M.
AU - Makishima, K.
AU - Terada, Y.
AU - Nomachi, M.
AU - Tashiro, M.
N1 - Funding Information:
Manuscript received November 15, 2004; revised August 5, 2005. This work was supported by the U.S. Department of Energy, under Contract DE-AC02-76SF00515, by the Ministry of Education, Culture, Sports, Science and Technology of Japan under Grants-in-Aid 12554006 and 13304014, and by the Japan Space Forum under “Ground-Based Research Announcement for Space Utilization.” H. Tajima, T. Kamae, and G. Madejski are with the Stanford Linear Accelerator Center and Kavli Institute of Particle Astrophysics and Cosmology, Menlo Park, CA 94025 USA. T. Mitani, T. Tanaka, T. Takahashi, and S. Watanabe are with the Institute of Space and Astronautical Science, Sagamihara, Kanagawa 229–8510, Japan and also with the University of Tokyo, Bunkyo-ku, Tokyo 113–0033, Japan. K. Nakazawa is with the Institute of Space and Astronautical Science, Sagamihara, Kanagawa 229–8510, Japan. Y. Fukazawa is with Hiroshima University, Higashi-Hiroshima, Hiroshima 739–8526, Japan. T. Ikagawa and J. Kataoka are with the Tokyo Institute of Technology, Me-guro-ku, Tokyo 152–8551, Japan. M. Kokubun and K. Makishima are with the University of Tokyo, Bunkyo-ku, Tokyo 113–0033, Japan. Y. Terada is with RIKEN, Wako, Saitama 351–0198, Japan. M. Nomachi is with Osaka University, Toyonaka, Osaka 560–8532, Japan. M. Tashiro is with Saitama University, Saitama, Saitama 338–8570Japan. Digital Object Identifier 10.1109/TNS.2005.862776
PY - 2005/12
Y1 - 2005/12
N2 - The soft gamma-ray detector (SGD) onboard the Japanese future high energy astrophysics mission (NeXT) is a Compton telescope with narrow field of view, which utilizes Compton kinematics to enhance its background rejection capabilities. It is realized as a hybrid semiconductor gamma-ray detector which consists of silicon and cadmium telluride (CdTe) detectors. It can detect photons in a wide energy band (0.05-1 MeV) at a background level of 5 × 10-7 counts/s/cm2/keV; the silicon layers are required to improve the performance at a lower energy band (<0.3 MeV). Excellent energy resolution is the key feature of the SGD, allowing it to achieve both high angular resolution and good background rejection capability. An additional capability of the SGD, its ability to measure gamma-ray polarization, opens up a new window to study properties of astronomical objects. We will present the development of key technologies to realize the SGD: high quality CdTe, low noise front-end application-specific integrated circuit, and bump bonding technology. Energy resolutions of 1.7 keV (full-width at half-maximum) for CdTe pixel detectors and 1.1 keV for Si strip detectors have been measured. We also present the validation of Monte Carlo simulation used to evaluate the performance of the SGD.
AB - The soft gamma-ray detector (SGD) onboard the Japanese future high energy astrophysics mission (NeXT) is a Compton telescope with narrow field of view, which utilizes Compton kinematics to enhance its background rejection capabilities. It is realized as a hybrid semiconductor gamma-ray detector which consists of silicon and cadmium telluride (CdTe) detectors. It can detect photons in a wide energy band (0.05-1 MeV) at a background level of 5 × 10-7 counts/s/cm2/keV; the silicon layers are required to improve the performance at a lower energy band (<0.3 MeV). Excellent energy resolution is the key feature of the SGD, allowing it to achieve both high angular resolution and good background rejection capability. An additional capability of the SGD, its ability to measure gamma-ray polarization, opens up a new window to study properties of astronomical objects. We will present the development of key technologies to realize the SGD: high quality CdTe, low noise front-end application-specific integrated circuit, and bump bonding technology. Energy resolutions of 1.7 keV (full-width at half-maximum) for CdTe pixel detectors and 1.1 keV for Si strip detectors have been measured. We also present the validation of Monte Carlo simulation used to evaluate the performance of the SGD.
KW - Cadmium telluride (CdTe)
KW - Compton camera
KW - Gamma-ray astronomy detectors
KW - Polarimetry
KW - Silicon radiation detectors
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U2 - 10.1109/TNS.2005.862776
DO - 10.1109/TNS.2005.862776
M3 - Article
AN - SCOPUS:33144458024
SN - 0018-9499
VL - 52
SP - 2749
EP - 2757
JO - IEEE Transactions on Nuclear Science
JF - IEEE Transactions on Nuclear Science
IS - 6
ER -