Abstract
Physics beyond the standard model is being sought in Ge experiments in two quite different ways: looking for neutrinoless double beta decay in 76Ge and for dark matter collisions with Ge atoms. Lifetime limits on the former, now (5–9) × 10 23 yr, provide severe constraints on (1) lepton number nonconservation; (2) the effective mass of a light Majorana electron neutrino; (3) right-handed currents; (4) the mass of a heavy Majorana neutrino; (5) the ũ squark mass as a function of gaugino mass in supersymmetric theories with R-parity violation; and (6) for a different decay mode, the coupling of a Majoron to the electron neutrino. The dark matter search has eliminated a class of shadow matter and is setting constraints on masses of various kinds of weakly interacting massive particles. In both pursuits new techniques are starting to be used which promise even better results soon.
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