Performance evaluation of position-sensitive silicon detectors with four-corner readout

摘要

We report on a recently developed large-area position-sensitive silicon detector type with four-corner readout. It consists of a square-shaped ion-implanted resistive anode framed by additional low-resistivity strips with resistances smaller than the anode surface resistance by a factor of two. The detector-position linearity, position resolution and energy resolution were measured with α-particles and accelerated heavy ions. In-beam experimental results reveal a position resolution below 1 mm (FWHM) and a very good non-linearity of less than 1% (rms). The energy resolution determined from ~(228)Th alpha source measurements corresponding to an alpha line energy of 6778 keV is 155 and 68 keV (FWHM) for detectors with geometric areas of 62 mm × 62 mm and 20 mm × 20 mm, respectively.