2016年12月
Study of the polarimetric performance of a Si/CdTe semiconductor Compton camera for the Hitomi satellite
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
- 巻
- 840
- 号
- 開始ページ
- 51
- 終了ページ
- 58
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1016/j.nima.2016.09.057
- 出版者・発行元
- ELSEVIER SCIENCE BV
Gamma-ray polarization offers a unique probe into the geometry of the y-ray emission process in celestial objects. The Soft Gamma-ray Detector (SGD) onboard the X-ray observatory Hitomi is a SVCdTe Compton camera and is expected to be an excellent polarimeter, as well as a highly sensitive spectrometer due to its good angular coverage and resolution for Compton scattering. A beam test of the final-prototype for the SGD Compton camera was conducted to demonstrate its polarimetric capability and to verify and calibrate the Monte Carlo simulation of the instrument. The modulation factor of the SGD prototype camera, evaluated for the inner and outer parts of the CdTe sensors as absorbers, was measured to be 0.649-0.701 (inner part) and 0.637-0.653 (outer part) at 122.2 keV and 0.610-0.651 (inner part) and 0.564-0.592 (outer part) at 194.5 keV at varying polarization angles with respect to the detector. This indicates that the relative systematic uncertainty of the modulation factor is as small as similar to 3%.
- リンク情報
- ID情報
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- DOI : 10.1016/j.nima.2016.09.057
- ISSN : 0168-9002
- eISSN : 1872-9576
- Web of Science ID : WOS:000390825800007