Abstract
The present paper gives a preliminary description of the INTEGRAL Soft Gamma-Ray Imager (ISGRI), a CdTe layer, replacing the first CsI layer of the INTEGRAL IMAGER model payload proposed in phase A study. It provides a much lower threshold, around 20 keV instead of 80 keV, allowing a study of the hard X-ray part of the spectrum of any source within the entire field of view. In addition it offers significantly better spatial resolution, better point source location accuracy and improved imaging sensitivity. The sensitivity to partially-coded sources is significantly enhanced. The spectroscopic performance is also strongly improved allowing the search for low-energy nucleosynthesis lines (44Ti) as well as cyclotron lines.
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