Development of enriched 106CdWO4 crystal scintillators to search for double beta decay processes in 106Cd
2011
DAMA/LIBRA is running at the Gran Sasso National Laboratory of the I.N.F.N. The data collected in the first six
annual cycle have already been released. The cumulative exposure – including that of the former DAMA/NaI
experiment (0.29 ton × yr) – is now 1.17 ton x yr, corresponding to 13 annual cycles; this exposure is orders of
magnitude larger than the exposures typically collected in the field. The data further confirm the model independent
evidence of the presence of Dark Matter (DM) particles in the galactic halo on the basis of the DM annual modulation
signature (8.9 σ C.L. for the cumulative exposure). In particular, the modulation amplitude of the single-hit events in
the (2 - 6) keV energy interval measured in NaI(Tl) target is (0.0116 ± 0.0013) cpd/kg/keV, the measured phase is
(146 ± 7) days and the measured period is (0.999 ± 0.002) yr, values well in agreement with those expected for the DM
particles. Various related arguments are addressed.
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