CAMEO/GEM program for future 2β decay and dark matter experiments

The sensitivity (T1/2 limit for 0ν2β decay) of CAMEO experiment with ∼100 kg of 116CdWO4 crystals placed in the liquid scintillator of the BOREXINO CTF is ∼1026 yr, which corresponds to a bound on the neutrino mass mν, ≤ 0.06 eV. It would be improved by the GEM project with one ton of 'naked' HP Ge detectors operating in HP liquid nitrogen. The latest is contained in the Cu cryostat placed in the CTF water tank. The sensitivity of the GEM-I phase with natural Ge crystals is ∼ 1027 yr (or mν ≤ 0.05 eV), while in the GEM-II stage with enriched (in 76Ge to 86%) detectors it is ∼ 1028 yr (or mν ≤ 0.015 eV). Besides, the GEM-I set up could advance the best limits on the existence of neutralinos - as dark matter candidates - by three order of magnitude, and at the same time would be able to identify the dark matter signal by detection of its seasonal modulation