Detailed Investigations on Abnormal Pulse Shapes in Ge(Li)-Detectors

The detailed pulse form for pulses with abnormally long rise times have been measured in two different Ge(Li)-detectors. Most of these pulses show distinctive differences from normal pulse shapes. These deviations can be explained by the existence of local zones with highly reduced electric field strength, which lead to long drift times and an increased trapping probability. The observed correlation between abnormal pulse shapes and nonideal charge collection is discussed.