Nuclear Physics and Atomic Energy

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Nuclear Physics and Atomic Energy

  ISSN: 1818-331X (Print), 2074-0565 (Online)
  Publisher: Institute for Nuclear Research of the National Academy of Sciences of Ukraine
  Languages: Ukrainian, English
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Nucl. Phys. At. Energy 2011, volume 12, issue 1, pages 40-48.
Section: Nuclear Physics.
Received: 07.06.2010; Published online: 30.03.2011.
PDF Full text (en)
https://doi.org/10.15407/jnpae2011.01.040

Results on dark matter by DAMA/LIBRA at Gran Sasso

R. Bernabei1,2, P. Belli1, F. Cappella3,4, R. Cerulli5, C.J. Dai6, A. d'Angelo3,4, H. L. He6, A. Incicchitti3, X. H. Ma6, F. Montecchia1,7, F. Nozzoli1,2, D. Prosperi3,4, X. D. Sheng6, R. G. Wang6, Z. P. Ye6,8

1Istituto Nazionale di Fisica Nucleare, Sezione Roma "Tor Vergata", Rome, Italy
2Dipartimento di Fisica, Università di Roma "Tor Vergata", Rome, Italy
3Istituto Nazionale di Fisica Nucleare, Sezione Roma, Rome, Italy
4Dipartimento di Fisica, Università di Roma "La Sapienza", Rome, Italy
5Laboratori Nazionali del Gran Sasso, Istituto Nazionale di Fisica Nucleare. Assergi, Italy
6Chinese Academy, Beijing, China
7Laboratorio Sperimentale Policentrico di Ingegneria Medica, Università di Roma "Tor Vergata", Rome, Italy
8University of Jing Gangshan, Jiangxi, China

Abstract: DAMA/LIBRA is running at the Gran Sasso National Laboratory of the I.N.F.N. The data collected in the first six annual cycles have already been released. The cumulative exposure - including that of the former DAMA/NaI experiment (0.29 t · yr) - is now 1.17 t · yr, corresponding to 13 annual cycles; this exposure is orders of magnitude larger than the exposures typically collected in the field. The data further confirm the model independent evidence of the presence of Dark Matter (DM) particles in the galactic halo on the basis of the DM annual modulation signature (8.9 σ C.L. for the cumulative exposure). In particular, the modulation amplitude of the single-hit events in the (2 - 6) keV energy interval measured in NaI(Tl) target is (0.0116 ± 0.0013) cpd/kg/keV, the measured phase is (146 ± 7) days and the measured period is (0.999 ± 0.002) yr, values well in agreement with those expected for the DM particles. Various related arguments are addressed.

Keywords: dark matter, experiment DAMA/NaI, DAMA/LIBRA.

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