A pulse-shape analysis approach to 3-D position determination in large-volume segmented HPGe detectors

This paper is focused on the problem of the spatial localization of radiation-matter interaction in segmented large-volume HPGe detectors. The information is stored in the shapes of the current signals from the various segments. In order to design the algorithms, pulse shapes in a truly coaxial HPGe detector are calculated in closed form. Possible signatures dependent on a single interaction coordinate are found and a rough 3-D localization is obtained. The effects on pulse shapes of the detector encapsulating metallic cluster and of the gaps between sensing electrodes in terms of crosstalks due to capacitive coupling are also investigated.