The Majorana Ge-76 Double-Beta Decay Project
  The Majorana Experiment is a next-generation Ge-76 double-beta decay search. It will employ 500 kg of Ge, isotopically enriched to 86% in Ge-76, in the form of 200 detectors in a close-packed array for high granularity. Each crystal will be electronically segmented, with each region fitted with pulse-shape analysis electronics. A half-life sensitivity is predicted of 4.2e27 y or <m_nu> < 0.02-0.07 eV, depending on the nuclear matrix elements used to interpret the data. 
The Majorana Collaboration: C.E. Aalseth, D. Anderson, F.T. Avignone   III, A. Barabash, T.W. Bowyer, R.L. Brodzinski, V. Br...