Bulk and Surface Event Identification in p-type Germanium Detectors

Abstract

The p-type point-contact germanium detectors have been adopted for light dark matter WIMP searches and the studies of low energy neutrino physics. These detectors exhibit anomalous behavior to events located at the surface layer. The previous spectral shape method to identify these surface events from the bulk signals relies on spectral shape assumptions and the use of external calibration sources. We report an improved method in separating them by taking the ratios among different categories of in situ event samples as calibration sources. Data from CDEX-1 and TEXONO experiments are re-examined using the ratio method. Results are shown to be consistent with the spectral shape method.

arXiv comment29 pages, 16 figures

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Cited by in corpus (21)

• Limits on Light Weakly Interacting Massive Particles from the First 102.8 kg $\times$ day Data of the CDEX-10 Experiment
• Search for Light Weakly-Interacting-Massive-Particle Dark Matter by Annual Modulation Analysis with a Point-Contact Germanium Detector at the China Jinping Underground Laboratory
• Limits on light WIMPs with a 1 kg-scale germanium detector at 160 eVee physics threshold at the China Jinping Underground Laboratory
• Constraints on Sub-GeV Dark Matter--Electron Scattering from the CDEX-10 Experiment
• Direct Detection Constraints on Dark Photons with CDEX-10 Experiment at the China Jinping Underground Laboratory
• Improved limits on solar axions and bosonic dark matter from the CDEX-1B experiment using the profile likelihood ratio method
• New Limits on Coherent Neutrino Nucleus Elastic Scattering Cross Section at the Kuo-Sheng Reactor Neutrino Laboratory
• Exotic Dark Matter Search with CDEX-10 Experiment at China's Jinping Underground Laboratory
• Performances of a prototype point-contact germanium detector immersed in liquid nitrogen for light dark matter search
• First experimental constraints on WIMP couplings in the effective field theory framework from CDEX
• Study on cosmogenic activation in germanium detectors for future tonne-scale CDEX experiment
• Experimental Limits on Solar Reflected Dark Matter with a New Approach on Accelerated-Dark-Matter-Electron Analysis in Semiconductors
• Identification of the anomalous fast bulk events in a p-type point contact germanium detector
• Search for exotic interactions of solar neutrinos in the CDEX-10 experiment
• Pulse shape discrimination for the CONUS experiment in the keV and sub-keV regime
• Modeling the Charge Collection Efficiency in the Li-diffused Inactive Layer of a P-type Point-Contact Germanium Detector
• Prototype of Pulse Digitizer and Readout Electronics for CDEX-10 in CJPL
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• Bulk-Surface Event Discrimination in Point Contact Germanium Detectors at Near-Threshold Energies with Shape-Matching Pulse-Shape Methods
• Constraining Dark Matter Models with a Light Mediator from CDEX-10 Experiment at China Jinping Underground Laboratory
• Unified framework for precise background modeling to enhance rare event detection at the Kuo-Sheng nuclear reactor laboratory