PERFORMANCE OF A GE 200-STRIP DETECTOR FOR INELASTIC X-RAY-SCATTERING STUDIES

Fabrication and test of a position-sensitive Ge detector with 200 strips are presented. The detector was designed for the energy analysis of Compton scattered photons dispersed on the Rowland circle of a Cauchois-type cylindrically bent crystal. Each strip of the liquid nitrogen cooled detector, 200-mu-m wide and separated by a 34-mu-m wide grooves, is read out by an individual amplification channel. Encoding of discriminator signals enables the rejection of pulses originating simultaneously in more than one strip. The detector combines high efficiency for 30-50 keV photons with good reproducibility of this figure for each strip. The energy resolution of about 10% is only moderate, but it may be improved by a special preamplifier design with a cooled input stage.