The results obtained with the total exposure of 1.04 ton \times yr collected by DAMA/LIBRA–phase1 deep underground at the Gran Sasso National Laboratory ( LNGS ) of the I.N.F.N .
during 7 annual cycles ( i.e .
adding a further 0.17 ton \times yr exposure ) are presented .
The DAMA/LIBRA–phase1 data give evidence for the presence of Dark Matter ( DM ) particles in the galactic halo , on the basis of the exploited model independent DM annual modulation signature by using highly radio-pure NaI ( Tl ) target , at 7.5 \sigma C.L .
Including also the first generation DAMA/NaI experiment ( cumulative exposure 1.33 ton \times yr , corresponding to 14 annual cycles ) , the C.L .
is 9.3 \sigma and the modulation amplitude of the single-hit events in the ( 2–6 ) keV energy interval is : ( 0.0112 \pm 0.0012 ) cpd/kg/keV ; the measured phase is ( 144 \pm 7 ) days and the measured period is ( 0.998 \pm 0.002 ) yr , values well in agreement with those expected for DM particles .
No systematic or side reaction able to mimic the exploited DM signature has been found or suggested by anyone over more than a decade .