Identification of the anomalous fast bulk events in a p-type point contact germanium detector

Abstract

The ultralow detection threshold, ultralow intrinsic background, and excellent energy resolution of p-type point-contact germanium detector are important for rare-event searches, in particular for the detection of direct dark matter interactions, coherent elastic neutrino-nucleus scattering, and neutrinoless double beta decay. Anomalous bulk events with an extremely fast rise time are observed in the CDEX-1B detector. We report a method of extracting fast bulk events from bulk events using a pulse shape simulation and reconstructed source experiment signature. Calibration data and the distribution of X-rays generated by intrinsic radioactivity verified that the fast bulk experienced a single hit near the passivation layer. The performance of this germanium detector indicates that it is capable of single-hit bulk spatial resolution and thus provides a background removal technique.

13 pages, 18 figures, submit to NST

References in corpus (4)

• Results from a Search for Light-Mass Dark Matter with a P-type Point Contact Germanium Detector
• Dark Matter Evidence, Particle Physics Candidates and Detection Methods
• The China Jinping Underground Laboratory and its Early Science
• SAGE : A Monte Carlo Simulation Framework for Experiments with Germanium Detectors

Cited by in corpus (4)

• An Improved Bound on Accelerated Light Dark Matter
• Pulse shape discrimination for the CONUS experiment in the keV and sub-keV regime
• Exotic dark matter search with the Majorana Demonstrator
• Modeling the Charge Collection Efficiency in the Li-diffused Inactive Layer of a P-type Point-Contact Germanium Detector