The Majorana Demonstrator calibration system

Abstract

The MAJORANA Collaboration is searching for the neutrinoless double-beta decay of the nucleus ${}^{76}$Ge. The MAJORANA DEMONSTRATOR is an array of germanium detectors deployed with the aim of implementing background reduction techniques suitable for a 1-tonne ${}^{76}$Ge-based search. The ultra low-background conditions require regular calibrations to verify proper function of the detectors. Radioactive line sources can be deployed around the cryostats containing the detectors for regular energy calibrations. When measuring in low-background mode, these line sources have to be stored outside the shielding so they do not contribute to the background. The deployment and the retraction of the source are designed to be controlled by the data acquisition system and do not require any direct human interaction. In this paper, we detail the design requirements and implementation of the calibration apparatus, which provides the event rates needed to define the pulse-shape cuts and energy calibration used in the final analysis as well as data that can be compared to simulations.

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Cited by in corpus (21)

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• A Search for Neutrinoless Double-Beta Decay in ${}^{76}$Ge with 26 kg-yr of Exposure from the MAJORANA DEMONSTRATOR
• Final Result of the MAJORANA DEMONSTRATOR's Search for Neutrinoless Double-$\beta$ Decay in ${}^{76}$Ge
• Multi-site event discrimination for the MAJORANA DEMONSTRATOR
• Initial Results from the MAJORANA DEMONSTRATOR
• Fabrication and Characterization of High-Purity Germanium Detectors with Amorphous Germanium Contacts
• Constraints on the decay of ${}^{180m}$Ta
• The MAJORANA DEMONSTRATOR Readout Electronics System
• ADC Nonlinearity Correction for the MAJORANA DEMONSTRATOR
• Neutrinoless Double Beta Decay with Germanium Detectors: 10${}^{26}$ yr and Beyond
• Charge Trapping and Energy Performance of the MAJORANA DEMONSTRATOR
• Energy Calibration of Germanium Detectors for the MAJORANA DEMONSTRATOR
• Search for charge nonconservation and Pauli exclusion principle violation with the Majorana Demonstrator
• Signatures of muonic activation in the Majorana Demonstrator
• 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
• Experimental study of 13C(α,n)16O reactions in the Majorana Demonstrator calibration data
• Recent Results from the Majorana Demonstrator
• Calibration sources for the LEGEND-200 experiment
• Rare multi-nucleon decays with the full data sets of the Majorana Demonstrator
• Recent Results of the Majorana Demonstrator Experiment