Abstract
Results of a study of time spreads of pulses from silicon drifted detectors, irradiated by 976 keV ( 207Bi) electrons at their positive electrode side are presented. A number of 0.8–2.4 mm thick detectors were tested at room temperature and at liquid nitrogen temperature. Two components of the time spreads have been found to exist; one of them being proportional to the detector pulse rise time and inversely proportional to the reduced average range of the beta particles, and the other one independent on these quantities, however, characteristic for the individual detector. Initial risetimes of the pulses (up to 20% of the total amplitude) were determined. The results are in disagreement with the predictions of the available approximate theory of charge collection in detectors.
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