First Model Independent Results from DAMA/LIBRA–Phase2
| Autor: | Z. P. Ye, V. Merlo, Angelo Mattei, A. Incicchitti, P. Belli, F. Montecchia, Hui-Lin He, Alessandro Di Marco, F. Cappella, R. Cerulli, Andrea Bussolotti, A. d’Angelo, Xiangdong Sheng, C. J. Dai, V. Caracciolo, Xinhua Ma, R. Bernabei |
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| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Nuclear and High Energy Physics
DAMA/LIBRA Particle physics lcsh:QC793-793.5 Physics - Instrumentation and Detectors Cosmology and Nongalactic Astrophysics (astro-ph.CO) scintillation detectors Dark matter model-independent annual modulation signature General Physics and Astronomy FOS: Physical sciences Dark Matter elementary particle processes low background NaI(Tl) scintillators lcsh:Atomic physics. Constitution and properties of matter 01 natural sciences Particle detector dark matter Settore FIS/04 - Fisica Nucleare e Subnucleare High Energy Physics - Experiment Nuclear physics High Energy Physics - Experiment (hep-ex) 0103 physical sciences 010306 general physics dama experiments Physics 010308 nuclear & particles physics lngs lcsh:Elementary particle physics Instrumentation and Detectors (physics.ins-det) Iodine compounds lcsh:QC170-197 Amplitude Scintillation counter Measuring instrument National laboratory Astrophysics - Cosmology and Nongalactic Astrophysics |
| Zdroj: | Universe, Vol 4, Iss 11, p 116 (2018) Âderna Fìzika ta Energetika, Vol 19, Iss 4, Pp 307-325 (2018) |
| ISSN: | 2218-1997 |
| Popis: | The first model independent results obtained by the DAMA/LIBRA-phase2 experiment are presented. The data have been collected over 6 annual cycles corresponding to a total exposure of 1.13 ton $\times$ yr, deep underground at the Gran Sasso National Laboratory (LNGS) of the I.N.F.N. The DAMA/LIBRA-phase2 apparatus, $\simeq$ 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. New data analysis strategies are presented. The DAMA/LIBRA-phase2 data confirm the evidence of a signal that meets all the requirements of the model independent Dark Matter (DM) annual modulation signature, at 9.5 $\sigma$ 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 (exposure $1.33$ ton $\times$ yr, collected over 14 annual cycles), the achieved C.L. for the full exposure (2.46 ton $\times$ yr) is 12.9 $\sigma$; the modulation amplitude of the single-hit scintillation events is: $(0.0103 \pm 0.0008)$ cpd/kg/keV, the measured phase is $(145 \pm 5)$ days and the measured period is $(0.999 \pm 0.001)$ yr, all these values are well in agreement with those expected for DM particles. No systematics or side reaction able to mimic the exploited DM signature (i.e. to account for the whole measured modulation amplitude and to simultaneously satisfy all the requirements of the signature), has been found or suggested by anyone throughout some decades thus far. Comment: 28 pages, 17 figures, 5 tables. In press on Journal Nucl. Phys. and Atomic Energy. arXiv admin note: substantial text overlap with arXiv:1308.5109, arXiv:1002.1028, arXiv:1306.1411 |
| Databáze: | OpenAIRE |
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