Beam test results for single- and double-sided irradiated silicon detector prototypes of the CMS Central Detector

We present the results of two beam tests performed in July and September 1996 at CERN in order to study the behaviour of irradiated single- and double-sided silicon detectors from different manufacturers. All detectors had been irradiated with neutrons, up to a maximum fluence of 3.6 x 10(13) cm(-2), and had reached type inversion. Signal-to-noise ratio, resolution and efficiency have been studied for different values of detectors bias voltage, operation temperature (ranging from - 10 degrees C to f 20 degrees C) and read-out pitch and, in some case, for different incidence angle of the incoming particle. The results are promising, since no dramatic deterioration of detector performances has been observed. (C) 1998 Elsevier Science B.V. All rights reserved.