Abstract
The DAMA/LIBRA experiment (∼ 250 kg of highly radio-pure NaI(Tl)) is running deep underground at the Gran Sasso National Laboratory (LNGS) of the I.N.F.N. Here we briefly recall the results obtained in its first phase of measurements (DAMA/LIBRA–phase1; total exposure: 1.04 ton × yr). DAMA/LIBRA–phase1 and the former DAMA/NaI (cumulative exposure: 1.33 ton × yr) give evidence at 9.3 σ C.L. for the presence of DM particles in the galactic halo by exploiting the model-independent DM annual modulation signature. No systematic or side reaction able to mimic the exploited DM signature has been found or suggested by anyone over more than a decade. At present DAMA/LIBRA–phase2 is running with increased sensitivity.
Highlights
The DAMA project is based on the development and use of low background scintillators
At present DAMA/LIBRA is running in its phase2 with increased sensitivity
The detailed description of the DAMA/LIBRA set-up during the phase1 has been discussed in details in Ref. [1,2,3,4, 8]
Summary
The DAMA project is based on the development and use of low background scintillators. When fitting the single-hit residual rate of DAMA/LIBRA–phase1 together with the DAMA/NaI ones, with the function: A cos (t − t0), considering a period T = 2 = 1 yr and a phase t0 = 152.5 day (June 2nd ) as expected by the DM annual modulation signature, the following modulation amplitude is obtained: A = (0.0110 ± 0.0012) cpd/kg/keV corresponding to 9.2 C.L..
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