Design and performance of the soft gamma-ray detector for the NeXT mission

H. Tajima, T. Kamae, G. Madejski, T. Mitani, K. Nakazawa, T. Tanaka, T. Takahashi, S. Watanabe, Y. Fukazawa, T. Ikagawa, Jun Kataoka, M. Kokubun, K. Makishima, Y. Terada, M. Nomachi, M. Tashiro

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)2749-2757
Number of pages9
JournalIEEE Transactions on Nuclear Science
Volume52
Issue number6
DOIs
Publication statusPublished - 2005 Dec
Externally publishedYes

Fingerprint

Gamma rays
gamma rays
Detectors
detectors
Cadmium telluride
cadmium tellurides
rejection
Band structure
energy bands
Silicon
Astrophysics
tellurides
application specific integrated circuits
silicon
Application specific integrated circuits
Full width at half maximum
angular resolution
Telescopes
low noise
field of view

Keywords

  • Cadmium telluride (CdTe)
  • Compton camera
  • Gamma-ray astronomy detectors
  • Polarimetry
  • Silicon radiation detectors

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Nuclear Energy and Engineering

Cite this

Tajima, H., Kamae, T., Madejski, G., Mitani, T., Nakazawa, K., Tanaka, T., ... Tashiro, M. (2005). Design and performance of the soft gamma-ray detector for the NeXT mission. IEEE Transactions on Nuclear Science, 52(6), 2749-2757. https://doi.org/10.1109/TNS.2005.862776

Design and performance of the soft gamma-ray detector for the NeXT mission. / Tajima, H.; Kamae, T.; Madejski, G.; Mitani, T.; Nakazawa, K.; Tanaka, T.; Takahashi, T.; Watanabe, S.; Fukazawa, Y.; Ikagawa, T.; Kataoka, Jun; Kokubun, M.; Makishima, K.; Terada, Y.; Nomachi, M.; Tashiro, M.

In: IEEE Transactions on Nuclear Science, Vol. 52, No. 6, 12.2005, p. 2749-2757.

Research output: Contribution to journalArticle

Tajima, H, Kamae, T, Madejski, G, Mitani, T, Nakazawa, K, Tanaka, T, Takahashi, T, Watanabe, S, Fukazawa, Y, Ikagawa, T, Kataoka, J, Kokubun, M, Makishima, K, Terada, Y, Nomachi, M & Tashiro, M 2005, 'Design and performance of the soft gamma-ray detector for the NeXT mission', IEEE Transactions on Nuclear Science, vol. 52, no. 6, pp. 2749-2757. https://doi.org/10.1109/TNS.2005.862776
Tajima, H. ; Kamae, T. ; Madejski, G. ; Mitani, T. ; Nakazawa, K. ; Tanaka, T. ; Takahashi, T. ; Watanabe, S. ; Fukazawa, Y. ; Ikagawa, T. ; Kataoka, Jun ; Kokubun, M. ; Makishima, K. ; Terada, Y. ; Nomachi, M. ; Tashiro, M. / Design and performance of the soft gamma-ray detector for the NeXT mission. In: IEEE Transactions on Nuclear Science. 2005 ; Vol. 52, No. 6. pp. 2749-2757.
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