An assay-based background projection for the MAJORANA DEMONSTRATOR using Monte Carlo Uncertainty Propagation

Abstract

The background index is an important quantity which is used in projecting and calculating the half-life sensitivity of neutrinoless double-beta decay ($0\nu \beta \beta$) experiments. A novel analysis framework is presented to calculate the background index using the specific activities, masses and simulated efficiencies of an experiment's components as distributions. This Bayesian framework includes a unified approach to combine specific activities from assay. Monte Carlo uncertainty propagation is used to build a background index distribution from the specific activity, mass and efficiency distributions. This analysis method is applied to the MAJORANA DEMONSTRATOR, which deployed arrays of high-purity Ge detectors enriched in ${}^{76}$Ge to search for $0\nu \beta \beta$. The framework projects a mean background index of $\left[8.95\pm 0.36\right]\times 10^{-4}$cts/(keV kg yr) from ${}^{232}$Th and ${}^{238}$U in the DEMONSTRATOR's components.

9 pages, 3 figures

References in corpus (18)

• Double Beta Decay, Majorana Neutrinos, and Neutrino Mass
• Final Results of GERDA on the Search for Neutrinoless Double-$\beta$ Decay
• Search for Neutrinoless Double-Beta Decay with the Complete EXO-200 Dataset
• Search for the Majorana Nature of Neutrinos in the Inverted Mass Ordering Region with KamLAND-Zen
• The Large Enriched Germanium Experiment for Neutrinoless Double Beta Decay (LEGEND)
• Sensitivity and discovery potential of the proposed nEXO experiment to neutrinoless double beta decay
• NEXO: Neutrinoless double beta decay search beyond $10^{28}$ year half-life sensitivity
• \textsc{MaGe} - a {\sc Geant4}-based Monte Carlo Application Framework for Low-background Germanium Experiments
• The projected background for the CUORE experiment
• The Majorana Demonstrator Radioassay Program
• Final Result of the MAJORANA DEMONSTRATOR's Search for Neutrinoless Double-$\beta$ Decay in ${}^{76}$Ge
• The Sanford Underground Research Facility at Homestake
• The Processing of Enriched Germanium for the MAJORANA DEMONSTRATOR and R&D for a Possible Future Ton-Scale Ge-76 Double-Beta Decay Experiment
• Ge Detectors and $0\nu \beta \beta$: The Search for Double Beta Decay with Germanium Detectors: Past, Present and Future
• Large Plastic Scintillator Panels with WLS Fiber Readout; Optimization of Components
• The MAJORANA DEMONSTRATOR Readout Electronics System
• Limits on uranium and thorium bulk content in GERDA Phase I detectors
• High voltage testing for the MAJORANA Demonstrator