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Particle Detector To detect scattered ions, recoiling target nuclei, decay particles and to allow for -ray Doppler shift corrections, a position-sensitive semiconductor ring counter will be used - a Double-Sided Silicon Strip Detector (DSSSD) with compact disc geometry. • Theory The DSSSD is made up of a number of semiconducting strips, cross-laid on each side. An applied bias voltage depletes the full detector, so when a particle hits the detector, electron-hole pairs are created. They start to drift in the electric field and cause a charged pulse that can be detected. The particle position is determined in one dimension on each side of the strip. • Data Total area = 50 cm2 (93% active) 16 annular p+ strips/quadrant 24 sector n+ strips/quadrant In total 160 discrete detectors Wafer thickness 35 - 1000 m E-E mounting