https://doi.org/10.1051/epjconf/20147000043
The Dark Matter annual modulation results from DAMA/LIBRA
1 Dip. di Fisica, Università di Roma “Tor Vergata”, I-00133 Rome, Italy
2 INFN, sez. Roma “Tor Vergata”, I-00133 Rome, Italy
3 Dip. di Fisica, Università di Roma “La Sapienza”, I-00185 Rome, Italy
4 INFN, sez. Roma, I-00185 Rome, Italy
5 Laboratori Nazionali del Gran Sasso, I.N.F.N., Assergi, Italy
6 IHEP, Chinese Academy, P.O. Box 918/3, Beijing 100039, China
7 Laboratorio Sperimentale Policentrico di Ingegneria Medica, Università degli Studi di Roma “Tor Vergata”
8 University of Jing Gangshan, Jiangxi, China
a e-mail: pierluigi.belli@roma2.infn.it
Published online: 10 April 2014
The DAMA/LIBRA experiment, running at the Gran Sasso National Laboratory of the I.N.F.N. in Italy, has a sensitive mass of about 250 kg highly radiopure NaI(Tl). It is mainly devoted to the investigation of Dark Matter (DM) particles in the Galactic halo by exploiting the model independent DM annual modulation signature. The present DAMA/LIBRA experiment and the former DAMA/NaI one (the first generation experiment having an exposed mass of about 100 kg) have released so far results corresponding to a total exposure of 1.17 ton × yr over 13 annual cycles. They provide a model independent evidence of the presence of DM particles in the galactic halo at 8.9 σ C.L. on the basis of the investigated DM signature. The data of another annual cycle in the same DAMA/LIBRA running conditions are at hand. After the replacement at the end of 2012 of all the photomultipliers (PMTs) with new ones, having higher quantum efficiency, DAMA/LIBRA has entered to its phase 2; such a replacements allowed the lowering of the software energy threshold of the experiment in the present data taking. A short summary of the obtained results is presented and future perspectives of the experiment mentioned.
© Owned by the authors, published by EDP Sciences, 2014
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 2.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
