The proposed Majorana double-beta decay experiment is based on an array of segmented intrinsic Ge detectors with a total mass of 500 kg of Ge isotopically enriched to 86% in 76 Ge. A discussion is given of background reduction by: material selection, detector segmentation, pulse shape analysis, and electro-formation of copper parts and granularity. Predictions of the experimental sensitivity are given. For an experimental running time of 10 years over the construction and operation of Majorana, a sensitivity of T 1/ 2 0 ~4 10 27 y is predicted. This corresponds to m ~0.03 0.04 eV according to recent QRPA and RQRPA matrix element calculations.

The analyzing power A~f or p+p elastic scattering at O~, b=8. 64'+0.07' (0, , =18.1') and at a bombarding energy of 183.1+0.4 MeV has been determined to be A~= 0.2122+0.0017. The error includes statistics, systematic uncertainties, and the uncertainty in bombarding energy and angle. This measurement represents a calibration standard for polarized beams in this energy range. The absolute scale for the measurement has been obtained by comparison with p +C elastic scattering at the same energy at an angle where A~i s very nearly unity.

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