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First Model Independent Results from DAMA/LIBRA–Phase2

Dip. di Fisica, Università di Roma “Tor Vergata”, I-00133 Rome, Italy
INFN, sez. Roma “Tor Vergata”, I-00133 Rome, Italy
Dip. di Fisica, Università di Roma “La Sapienza”, 00185 Rome, Italy
INFN, sez. Roma, 00185 Rome, Italy
INFN, Laboratori Nazionali del Gran Sasso, 67100 Assergi, Italy
Key Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences, P.O. Box 918/3, Beijing 100049, China
Dip. Ingegneria Civile e Ingegneria Informatica, Università di Roma “Tor Vergata”, 00133 Rome, Italy
College of Math & Physics, University of Jinggangshan, Ji’an City 343009, China
Author to whom correspondence should be addressed.
Universe 2018, 4(11), 116;
Received: 3 October 2018 / Revised: 29 October 2018 / Accepted: 1 November 2018 / Published: 6 November 2018
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 . View Full-Text
Keywords: dark matter; low background NaI(Tl) scintillators; model-independent annual modulation signature dark matter; low background NaI(Tl) scintillators; model-independent annual modulation signature
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MDPI and ACS Style

Bernabei, R.; Belli, P.; Bussolotti, A.; Cappella, F.; Caracciolo, V.; Cerulli, R.; Dai, C.-J.; D’Angelo, A.; Di Marco, A.; He, H.-L.; Incicchitti, A.; Ma, X.-H.; Mattei, A.; Merlo, V.; Montecchia, F.; Sheng, X.-D.; Ye, Z.-P. First Model Independent Results from DAMA/LIBRA–Phase2. Universe 2018, 4, 116.

AMA Style

Bernabei R, Belli P, Bussolotti A, Cappella F, Caracciolo V, Cerulli R, Dai C-J, D’Angelo A, Di Marco A, He H-L, Incicchitti A, Ma X-H, Mattei A, Merlo V, Montecchia F, Sheng X-D, Ye Z-P. First Model Independent Results from DAMA/LIBRA–Phase2. Universe. 2018; 4(11):116.

Chicago/Turabian Style

Bernabei, Rita, Pierluigi Belli, Andrea Bussolotti, Fabio Cappella, Vincenzo Caracciolo, Riccardo Cerulli, Chang-Jiang Dai, Annelisa D’Angelo, Alessandro Di Marco, Hui-Lin He, Antonella Incicchitti, Xin-Hua Ma, Angelo Mattei, Vittorio Merlo, Francesco Montecchia, Xiang-Dong Sheng, and Zi-Piao Ye. 2018. "First Model Independent Results from DAMA/LIBRA–Phase2" Universe 4, no. 11: 116.

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