20 January 2004 Properties of CdZnTe detectors in the Burst Alert Telescope (BAT) array
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The properties of 32k CdZnTe detectors have been studied in the pre-flight calibration of Burst Alert Telescope (BAT) on-board the Swift Gamma-ray Burst Explorer (scheduled for launch in January 2004). After corrections of the linearity and the gain, the energy resolution of summed spectrum is 7.0 keV (FWHM) at 122~keV. In order to construct response matrices for the BAT instrument, we extracted mobility-lifetime (μτ) products for electrons and holes in the CdZnTe. Based on a new method applied to 57Co spectra taken at different bias voltages, μτ for electrons ranges from 5.0x10-4 to 1.0x10-2cm2V-1, while μτ for holes ranges from 1.0x10-5 to 1.7x10-4cm2V-1. We show that the distortion of the spectrum and the peak efficiency of the BAT instrument are well reproduced by the μτ database constructed in the calibration.
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Goro Sato, Goro Sato, Tadayuki Takahashi, Tadayuki Takahashi, Kazuhiro Nakazawa, Kazuhiro Nakazawa, Shin Watanabe, Shin Watanabe, Makoto Tashiro, Makoto Tashiro, Masaya Suzuki, Masaya Suzuki, Yu Okada, Yu Okada, Hiromitsu Takahashi, Hiromitsu Takahashi, Ann M. Parsons, Ann M. Parsons, Jack Tueller, Jack Tueller, Hans Krimm, Hans Krimm, Scott D. Barthelmy, Scott D. Barthelmy, Jay Cummings, Jay Cummings, Craig Markwardt, Craig Markwardt, Derek D. Hullinger, Derek D. Hullinger, Neil A. Gehrels, Neil A. Gehrels, Edward E. Fenimore, Edward E. Fenimore, David Palmer, David Palmer, Anthony J. Dean, Anthony J. Dean, Dave Willis, Dave Willis, } "Properties of CdZnTe detectors in the Burst Alert Telescope (BAT) array", Proc. SPIE 5198, Hard X-Ray and Gamma-Ray Detector Physics V, (20 January 2004); doi: 10.1117/12.506460; https://doi.org/10.1117/12.506460

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