XXth International Conference on Neutrino Physics and Astrophysics

Poster Abstract

S.Elliott for the Majorana Collaboration

The Majorana 76Ge Double Beta Decay Project

The interest and relevance of next-generation 0nu beta-beta-decay experiments is increasing. Even with nonzero neutrino mass strongly suggested by solar and atmospheric neutrino experiments sensitive to delta m^2, 0nu beta-beta-decay experiments are still the only way to establish the Dirac or Majorana nature of neutrinos by measuring the effective electron neutrino mass, . In addition, the atmospheric neutrino oscillation experiments imply that at least one neutrino has a mass greater than about 50 meV. The Majorana Experiment expects to probe an effective neutrino mass near this critical value. Majorana is a next-generation 76Ge double-beta decay search. It will employ 500 kg of Ge, isotopically enriched to 86% in 76Ge, in the form of ~200 detectors in a close-packed array. Each crystal will be electronically segmented and each segment fitted with pulse-shape analysis electronics. This combination of segmentation and pulse-shape analysis significantly improves our ability to discriminate neutrinoless double beta-decay from internal cosmogenic 68Ge and 60Co. The half-life sensitivity is estimated to be 4x10^27 y corresponding to a range of < 20-70 meV, depending on the nuclear matrix elements used to interpret the data.

Based on hep-ex/0201021

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