The Majorana 76 Ge neutrino less double-beta decay project: a brief update

At present, Majorana is a research and development (R and D) project to investigate the feasibility and cost of constructing and operating a one ton 76Ge 0νββ-decay experiment with ∼1000 kg of Ge detectors fabricated from germanium enriched to 86% in 76Ge. The study will include three separate cryostats with various types of detectors: un-segmented, un-segmented point-contact, minimally segmented, and highly segmented. One cryostat will contain at least 30 kg of enriched (preferably point-contact) detectors. The performance of the cryostats and detectors as well as background levels will be investigated. The goal of the demonstrator project is to reach a 3σ discovery sensitivity of ∼ 1026y