Multi-site event discrimination for the MAJORANA DEMONSTRATOR

Abstract

The MAJORANA DEMONSTRATOR is searching for neutrinoless double-beta decay in 76Ge using arrays of point-contact germanium detectors operating at the Sanford Underground Research Facility. Background results in the neutrinoless double-beta decay region of interest from data taken during construction, commissioning, and the start of full operations have been recently published. A pulse shape analysis cut applied to achieve this result, named AvsE, is described in this paper. This cut is developed to remove events whose waveforms are typical of multi-site energy deposits while retaining (90 +/- 3.5)% of single-site events. This pulse shape discrimination is based on the relationship between the maximum current and energy, and tuned using 228Th calibration source data. The efficiency uncertainty accounts for variation across detectors, energy, and time, as well as for the position distribution difference between calibration and $0\nu \beta \beta$ events, established using simulations.

arXiv comment8 pages, 8 figures

References in corpus (8)

• Large-Mass Ultra-Low Noise Germanium Detectors: Performance and Applications in Neutrino and Astroparticle Physics
• Search for Zero-Neutrino Double Beta Decay in 76Ge with the Majorana Demonstrator
• \textsc{MaGe} - a {\sc Geant4}-based Monte Carlo Application Framework for Low-background Germanium Experiments
• New limits on Bosonic Dark Matter, Solar Axions, Pauli Exclusion Principle Violation, and Electron Decay from the Majorana Demonstrator
• Pulse shape discrimination for GERDA Phase I data
• The Sanford Underground Research Facility at Homestake
• The Majorana Demonstrator calibration system
• Delayed charge recovery discrimination of passivated surface alpha events in P-type point-contact detectors

Cited by in corpus (24)

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• Characterization of 30 ${}^{76}$Ge enriched Broad Energy Ge detectors for GERDA Phase II
• Simulation of semiconductor detectors in 3D with SolidStateDetectors.jl
• $\alpha$-event Characterization and Rejection in Point-Contact HPGe Detectors
• The MAJORANA DEMONSTRATOR Readout Electronics System
• Cosmogenic activation in double beta decay experiments
• ADC Nonlinearity Correction for the MAJORANA DEMONSTRATOR
• Neutrinoless Double Beta Decay with Germanium Detectors: 10${}^{26}$ yr and Beyond
• Pulse shape discrimination for the CONUS experiment in the keV and sub-keV regime
• The Majorana Demonstrator's Search for Double-Beta Decay of ${}^{76}$Ge to Excited States of ${}^{76}$Se
• Demonstration of new MeV-scale capabilities in large neutrino LArTPCs using ambient radiogenic and cosmogenic activity in MicroBooNE
• Searching for ${}^{76}$Ge neutrinoless double beta decay with the CDEX-1B experiment
• Investigation of ASIC-based signal readout electronics for LEGEND-1000
• Energy Calibration of Germanium Detectors for the MAJORANA DEMONSTRATOR
• Signatures of muonic activation in the Majorana Demonstrator
• Double Beta Decay Experiments at Canfranc Underground Laboratory
• Interpretable Boosted Decision Tree Analysis for the Majorana Demonstrator
• Final Results of the MAJORANA DEMONSTRATOR's Search for Double-Beta Decay of ${}^{76}$Ge to Excited States of ${}^{76}$Se
• A novel wide-angle Compton Scanner setup to study bulk events in germanium detectors
• A feasibility study of multi-electrode high-purity germanium detector for Ge-76 neutrinoless double beta decay searching
• Rare multi-nucleon decays with the full data sets of the Majorana Demonstrator
• CycleGAN-Driven Transfer Learning for Electronics Response Emulation in High-Purity Germanium Detectors
• Machine learning-powered data cleaning for LEGEND: a semi-supervised approach using affinity propagation and support vector machines