Determining the Drift Time of Charge Carriers in P-Type Point-Contact HPGe Detectors

Abstract

An algorithm to measure the drift time of charge carriers in p-type point contact (PPC) high-purity germanium (HPGe) detectors from the signals processed with a charge-sensitive preamplifier is introduced. It is demonstrated that the drift times can be used to estimate the distance of charge depositions from the point contact and to characterize losses due to charge trapping. A correction for charge trapping effects over a wide range of energies is implemented using the measured drift times and is shown to improve the energy resolution by up to 30%.

16 pages, 8 figures, submitted to Nucl. Instrum. Meth. A

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• Fabrication and Characterization of High-Purity Germanium Detectors with Amorphous Germanium Contacts
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• Characterization of High Purity Germanium Point Contact Detectors with Low Net Impurity Concentration
• Charge Trapping and Energy Performance of the MAJORANA DEMONSTRATOR
• Coherent Scattering Investigations at the Spallation Neutron Source: a Snowmass White Paper
• The impact of neutral impurity concentration on charge drift mobility in germanium
• Virtual segmentation of a small contact HPGe detector: inference of hit positions of single-site events via pulse shape analysis
• Bulk-Surface Event Discrimination in Point Contact Germanium Detectors at Near-Threshold Energies with Shape-Matching Pulse-Shape Methods
• The impact of neutral impurity concentration on charge drift mobility in n-type germanium
• Recent Results of the Majorana Demonstrator Experiment