High sensitivity double beta decay study of 116-Cd and 100-Mo with the BOREXINO Counting Test Facility (CAMEO project)
G. Bellini, B. Caccianiga, M. Chen, F. A. Danevich, M. G. Giammarchi, V. V. Kobychev, B. N. Kropivyansky, E. Meroni, L. Miramonti, A. S. Nikolayko, L. Oberauer, O. A. Ponkratenko, V. I. Tretyak, S. Yu. Zdesenko, Yu. G. Zdesenko
Abstract
The unique features (super-low background and large sensitive volume) of the CTF and BOREXINO set ups are used in the CAMEO project for a high sensitivity study of 100-Mo and 116-Cd neutrinoless double beta decay. Pilot measurements with 116-Cd and Monte Carlo simulations show that the sensitivity of the CAMEO experiment (in terms of the half-life limit for neutrinoless double beta decay) is (3-5) 1024 yr with a 1 kg source of 100-Mo (116-Cd, 82-Se, and 150-Nd) and about 1026 yr with 65 kg of enriched 116-CdWO4 crystals placed in the liquid scintillator of the CTF. The last value corresponds to a limit on the neutrino mass of less than 0.06 eV. Similarly with 1000 kg of 116-CdWO4 crystals located in the BOREXINO apparatus the neutrino mass limit can be pushed down to mnu<0.02 eV.
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