Application of micro-pixel chambers for X-ray polarimetry

✍ Scribed by M Ueno; H Kubo; K Miuchi; T Nagayoshi; R Orito; A Takada; A Takeda; T Tanimori; T Tsuru

• Publisher: Elsevier Science
• Year: 2004
• Tongue: English
• Weight: 237 KB
• Volume: 525
• Category: Article
• ISSN: 0168-9002
• DOI: 10.1016/j.nima.2004.03.020

✦ Synopsis

We measured the X-ray polarization using our micro-pixel chamber with a strip readout, while changing the X-ray energy (5-18 keV) and gas mixtures (neon-and argon-based). As a result, modulation factors of 0.18 (at 9 keV) and 0.12 (at 14 keV) were obtained for neon-and argon-based mixtures, respectively. We also simulated this experiment utilizing a Monte-Carlo code, EGS4, which reproduced the experimental results quite well. According to the Monte-Carlo simulation, the modulation factor should be improved by a pixel-readout detector. The simulated modulation factors are 0.25 (for X-ray with energy at > 6 keV) with a neon-based gas mixture and 0.18 (for X-ray at > 10 keV) with an argon-based one.