Proj
J-GLOBAL ID:200904051422168314  Research Project code:0350012167 Update date:Jan. 19, 2004

Fabrication of Hard X-ray Detector (HXD II) mounted on 'ASTRO-E II'

「ASTRO-E II」搭載硬X線検出器(HXD II)の製作
Study period:2001 - 2002
Organization (1):
Investigating Researcher (10):
Research overview:
HXD (Hard X-ray Detector) equipment is an instrument aiming at observation of cosmic hard X-rays of 10 to 600 keV as one of mission apparatuses. Mounted on HXD is a detector called 'well-type phoswitch counter' with Japan's own contrivance to keep its background very low. The well-type phoswitch counter has such a structure with a shield portion processed in well shape, in which detecting portion is buried, and its performance to eliminate background is predominantly superior to conventional articles because an active shield encloses a small detector for the most of its solid angle. Well-type phoswitch counter made with BGO scintillator with a high absorbing efficiency of gamma-rays can determine not only background gamma rays coming from bottom direction of the detector but also such gamma rays that Compton-scattered, lost slight energy there and then lost remained energy at GSO scintillator. This is background that could not be removed when so far using collimators made of metal. Silicon semiconductor detector of 2-mm thick was placed at the bottom of well-type collimator of this detection equipment and in front of GSO scintillator for signal detection, which covers energy range of 10 to 60 keV. HXD-II is a remade version of HXD, and the team that fabricated HXD is successively in charge of fabrication. With this HXD-II, Japan does step forward first into her own gamma-ray astronomy. In the 2002 fiscal year, we fabricated the detector to be mounted while confirming design like performing vibration test toward engaging test scheduled in the 2003 fiscal year.
Research program: Ordinary Research
Ministry with control over the research :
Ministry of Education, Culture, Sports, Science and Technology

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