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Open AccessArticle

First Model Independent Results from DAMA/LIBRA–Phase2

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Dip. di Fisica, Università di Roma “Tor Vergata”, I-00133 Rome, Italy
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INFN, sez. Roma “Tor Vergata”, I-00133 Rome, Italy
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Dip. di Fisica, Università di Roma “La Sapienza”, 00185 Rome, Italy
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INFN, sez. Roma, 00185 Rome, Italy
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INFN, Laboratori Nazionali del Gran Sasso, 67100 Assergi, Italy
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Key Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences, P.O. Box 918/3, Beijing 100049, China
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Dip. Ingegneria Civile e Ingegneria Informatica, Università di Roma “Tor Vergata”, 00133 Rome, Italy
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College of Math & Physics, University of Jinggangshan, Ji’an City 343009, China
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Author to whom correspondence should be addressed.
Universe 2018, 4(11), 116; https://doi.org/10.3390/universe4110116
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. https://doi.org/10.3390/universe4110116

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. https://doi.org/10.3390/universe4110116

Chicago/Turabian Style

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. 2018. "First Model Independent Results from DAMA/LIBRA–Phase2" Universe 4, no. 11: 116. https://doi.org/10.3390/universe4110116

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