The Majorana Demonstrator Status and Preliminary Results

Abstract

The Majorana Collaboration is using an array of high-purity Ge detectors to search for neutrinoless double-beta decay in 76Ge. Searches for neutrinoless double-beta decay are understood to be the only viable experimental method for testing the Majorana nature of the neutrino. Observation of this decay would imply violation of lepton number, that neutrinos are Majorana in nature, and provide information on the neutrino mass. The Majorana Demonstrator comprises 44.1 kg of p-type point-contact Ge detectors (29.7 kg enriched in 76Ge) surrounded by a low-background shield system. The experiment achieved a high efficiency of converting raw Ge material to detectors and an unprecedented detector energy resolution of 2.5 keV FWHM at Q${}_{\beta \beta }$. The Majorana collaboration began taking physics data in 2016. This paper summarizes key construction aspects of the Demonstrator and shows preliminary results from initial data.

5 pages, 2 figures. Proceeding for the "16th International Symposium on Capture Gamma-Ray Spectroscopy and Related Topics (CGS16)", 18-22 September 2017

References in corpus (12)

• Double Beta Decay, Majorana Neutrinos, and Neutrino Mass
• Colloquium: Majorana Fermions in nuclear, particle and solid-state physics
• Theory of neutrinoless double beta decay
• Neutrino-less Double Beta Decay and Particle Physics
• 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
• Recent Progress in Double Beta Decay
• Status and prospects of searches for neutrinoless double beta decay
• Double beta decay experiments
• Muon Flux Measurements at the Davis Campus of the Sanford Underground Research Facility with the Majorana Demonstrator Veto System
• The Processing of Enriched Germanium for the MAJORANA DEMONSTRATOR and R&D for a Possible Future Ton-Scale Ge-76 Double-Beta Decay Experiment
• Experimental searches of neutrinoless double beta decay

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