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Bernabei R.,University of Rome Tor Vergata | Belli P.,University of Rome Tor Vergata | Cappella F.,University of Rome La Sapienza | Cappella F.,National Institute of Nuclear Physics, Italy | And 19 more authors.
European Physical Journal C | Year: 2013

The results obtained with the total exposure of 1.04 ton × 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 × 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 7.5σ C.L. Including also the first generation DAMA/NaI experiment (cumulative exposure 1.33 ton × yr, corresponding to 14 annual cycles), the C.L. is 9.3σ and the modulation amplitude of the single-hit events in the (2-6) keV energy interval is: (0.0112±0.0012) cpd/kg/keV; the measured phase is (144±7) days and the measured period is (0.998±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. © 2013 The Author(s). Source


Bernabei R.,University of Rome Tor Vergata | Belli P.,University of Rome Tor Vergata | D'Angelo S.,University of Rome Tor Vergata | Di Marco A.,University of Rome Tor Vergata | And 17 more authors.
International Journal of Modern Physics A | Year: 2013

Experimental observations and theoretical arguments at Galaxy and larger scales have suggested that a large fraction of the Universe is composed by Dark Matter particles. This has motivated the DAMA experimental efforts to investigate the presence of such particles in the galactic halo by exploiting a model independent signature and very highly radiopure setup in deep underground. Few introductory arguments are summarized before presenting a review of the present model independent positive results obtained by the DAMA/NaI and DAMA/LIBRA setups at the Gran Sasso National Laboratory of the INFN. Implications and model dependent comparisons with other different kinds of results will be shortly addressed. Some arguments put forward in literature will be confuted. © 2013 World Scientific Publishing Company. Source


Bernabei R.,University of Rome Tor Vergata | Belli P.,University of Rome Tor Vergata | Cappella F.,National Institute of Nuclear Physics, Italy | Caracciolo V.,National Institute of Nuclear Physics, Italy | And 16 more authors.
European Physical Journal C | Year: 2014

This paper summarizes in a simple and intuitive way why the neutrons, the muons and the solar neutrinos cannot give any significant contribution to the DAMA annual modulation results. A number of these elements have already been presented in individual papers; they are recalled here together with few simple considerations which demonstrate the incorrectness of the claim reported in Davis (PRL 113:081302, 2014). © 2014, The Author(s). Source


Bernabei R.,University of Rome Tor Vergata | Belli P.,University of Rome Tor Vergata | Cappella F.,National Institute of Nuclear Physics, Italy | Caracciolo V.,National Institute of Nuclear Physics, Italy | And 16 more authors.
Nuclear and Particle Physics Proceedings | Year: 2015

The results obtained with the total exposure of 1.04 ton × 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 are summarized. The DAMA/LIBRA-phase1 and the former DAMA/NaI data (cumulative exposure 1.33 ton × yr, corresponding to 14 annual cycles) give evidence at 9.3 σ C.L. 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. The modulation amplitude of the single-hit events in the (2-6) keV energy interval is: (0.0112. ±. 0.0012) cpd/kg/keV; the measured phase is (144. ±. 7) days and the measured period is (0.998. ±. 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. Some of the perspectives of the presently running DAMA/LIBRA-phase2 are outlined. © 2015 Elsevier B.V. Source


Bernabei R.,University of Rome Tor Vergata | Belli P.,University of Rome Tor Vergata | Cappella F.,University of Rome La Sapienza | Cappella F.,National Institute of Nuclear Physics, Italy | And 16 more authors.
European Physical Journal C | Year: 2010

DAMA/LIBRA is running at the Gran Sasso National Laboratory of the I. N. F. N. Here the results obtained with a further exposure of 0.34 ton × yr are presented. They refer to two further annual cycles collected one before and one after the first DAMA/LIBRA upgrade occurred on September/October 2008. The cumulative exposure with those previously released by the former DAMA/NaI and by DAMA/LIBRA is now 1. 17 ton × yr, corresponding to 13 annual cycles. The data further confirm the previous positive results obtained investigating the presence of Dark Matter (DM) particles in the galactic halo by means of the model independent Dark Matter annual modulation signature; the confidence level is now 8.9 σ for the cumulative exposure. In particular, with the cumulative exposure 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. © Springer-Verlag / Società Italiana di Fisica 2010. Source

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