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Bernabei, Rita; Belli, Pierluigi; Bussolotti, Andrea; Cappella, Fabio; Caracciolo, Vincenzo; Cerulli, Riccardo; Dai, Chang-Jiang; D’Angelo, Annelisa; Di Marco, Alessandro; He, Hui-Lin; Incicchitti, Antonella; Ma, Xin-Hua; Mattei, Angelo; Merlo, Vittorio; Montecchia, Francesco; Sheng, Xiang-Dong; Ye, Zi-Piao
Universe (Basel), 11/2018, Volume: 4, Issue: 11Journal Article
The first results obtained by the DAMA/LIBRA–phase2 experiment are presented. The data have been collected over six independent annual cycles corresponding to a total exposure of 1.13 ton × year, deep underground at the Gran Sasso National Laboratory. The DAMA/LIBRA–phase2 apparatus, about 250 kg highly radio-pure NaI(Tl), profits from a second generation high quantum efficiency photomultipliers and of new electronics with respect to DAMA/LIBRA–phase1. The improved experimental configuration has also allowed to lower the software energy threshold. The DAMA/LIBRA–phase2 data confirm the evidence of a signal that meets all the requirements of the model independent Dark Matter annual modulation signature, at 9.5 σ C.L. in the energy region (1–6) keV. In the energy region between 2 and 6 keV, where data are also available from DAMA/NaI and DAMA/LIBRA–phase1, the achieved C.L. for the full exposure (2.46 ton × year) is 12.9 σ .
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