Double beta decay with large scale Yb-loaded scintillators

The potential of large scale Yb-loaded liquid scintillators as proposed for solar neutrino spectroscopy are investigated with respect to double beta decay. The potential for β^-β^- decay of ¹⁷⁶Yb as well as the β⁺/EC decay for ¹⁶⁸Yb is discussed. Not only getting for the first time an experimental half-life limit on ¹⁷⁶Yb decay, this will even be at least comparable or better than existing ones from different isotopes, for the first time a realistic chance to detect β⁺/EC decay exists. Effects of MeV-neutrinos are discussed as well.