The first model independent results obtained by the DAMA/LIBRA–phase2 experiment are presented .
The data have been collected over 6 annual cycles corresponding to a total exposure of 1.13 ton \times yr , deep underground at the Gran Sasso National Laboratory ( LNGS ) of the I.N.F.N .
The DAMA/LIBRA–phase2 apparatus , \simeq 250 kg highly radio-pure NaI ( Tl ) , profits from a second generation high quantum efficiency photomultipliers and of new electronics with respect to DAMA/LIBRA–phase1 .
The improved experimental configuration has also allowed to lower the software energy threshold .
New data analysis strategies are presented .
The DAMA/LIBRA–phase2 data confirm the evidence of a signal that meets all the requirements of the model independent Dark Matter ( DM ) annual modulation signature , at 9.5 \sigma C.L .
in the energy region ( 1–6 ) keV .
In the energy region between 2 and 6 keV , where data are also available from DAMA/NaI and DAMA/LIBRA–phase1 ( exposure 1.33 ton \times yr , collected over 14 annual cycles ) , the achieved C.L .
for the full exposure ( 2.46 ton \times yr ) is 12.9 \sigma ; the modulation amplitude of the single-hit scintillation events is : ( 0.0103 \pm 0.0008 ) cpd/kg/keV , the measured phase is ( 145 \pm 5 ) days and the measured period is ( 0.999 \pm 0.001 ) yr , all these values are well in agreement with those expected for DM particles .
No systematics or side reaction able to mimic the exploited DM signature ( i.e .
to account for the whole measured modulation amplitude and to simultaneously satisfy all the requirements of the signature ) , has been found or suggested by anyone throughout some decades thus far .