Final model independent result of DAMA/LIBRA-phase1

The results obtained with the total exposure of 1.04 ton × yr collected by DAMA/LIBRA–phase1 deep un- derground 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 × yr exposure) are presented. The DAMA/LIBRA– phase1 data give evidence for the presence of Dark Mat- ter (DM) particles in the galactic halo, on the basis of the exploited model independent DM annual modulation sig- nature by using highly radio-pure NaI(Tl) target, at 7.5σ C.L. Including also the first generation DAMA/NaI exper- iment (cumulative exposure 1.33 ton × yr, corresponding to 14 annual cycles), the C.L. is 9.3σ and the modula- tion amplitude of the single-hit events in the (2–6) keV en- ergy interval is: (0.0112 ± 0.0012) cpd/kg/keV; the mea- sured phase is (144 ± 7) days and the measured period is (0.998 ± 0.002) yr, values well in agreement with those ex- pected 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.