Properties of CdZnTe detectors in the Burst Alert Telescope (BAT) Array

Goro Sato, Tadayuki Takahashi, Kazuhiro Nakazawa, Shin Watanabe, Makoto Tashiro, Masaya Suzuki, Yuu Okada, Hiromitsu Takahashi, Ann Parsons, Jack Tueller, Hans Krimn, Scott Barthelmy, Jay Cummings, Craig Markwardt, Derek Hullinger, Neil Gehrels, Ed Fenimore, David Palmer, Tony Dean, Dave Willis

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

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 5.0×10-4 to 1.0×10-2cm2V -1, while μτ for holes ranges from 1.0 × 10-5 to 1.7 × 10-4cm2V-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.

Original languageEnglish
Pages (from-to)209-216
Number of pages8
JournalUnknown Journal
Volume5198
Publication statusPublished - 2004

Keywords

  • μτ products
  • BAT
  • CdZnTe
  • Lifetime
  • Mobility
  • Swift

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics

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    Sato, G., Takahashi, T., Nakazawa, K., Watanabe, S., Tashiro, M., Suzuki, M., Okada, Y., Takahashi, H., Parsons, A., Tueller, J., Krimn, H., Barthelmy, S., Cummings, J., Markwardt, C., Hullinger, D., Gehrels, N., Fenimore, E., Palmer, D., Dean, T., & Willis, D. (2004). Properties of CdZnTe detectors in the Burst Alert Telescope (BAT) Array. Unknown Journal, 5198, 209-216.