Final model independent results of DAMA/LIBRA-phase1 and perspectives of phase2

Journal Article · Sun Mar 15 04:00:00 EDT 2015 · Physics of Particles and Nuclei

DOI:https://doi.org/10.1134/S1063779615020045· OSTI ID:22977377

Bernabei, R. ^[1]; INFN, Rome ^[2]; Cappella, F. ^[3]; INFN, Rome ^[2]; Caracciolo, V.; Castellano, S. ^[4]; others, and

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1. Dip. di Fisica, Università di Roma “Tor Vergata”, Rome (Italy)
2. Italy
3. Dip. di Fisica, Università di Roma “La Sapienza”, Rome (Italy)
4. Laboratori Nazionali del Gran Sasso, I.N.F.N., Assergi (Italy)

This paper shortly summarizes the results obtained with the total exposure of 1.04 ton × yr collected by DAMA/LIBRA-phase1 deep underground at the Gran Sasso National Laboratory (LNGS) of the I.N.F.N. during 7 annual cycles. The DAMA/LIBRA-phase1 and the former DAMA/NaI data (cumulative exposure 1.33 ton × yr, corresponding to 14 annual cycles) give evidence at 9.3 σ C.L. for the presence of Dark Matter (DM) particles in the galactic halo, on the basis of the exploited model independent DM annual modulation signature by using highly radio-pure NaI(Tl) target. The modulation amplitude of the single-hit events in the (2–6) keV energy interval is: (0.0112 ± 0.0012) cpd/kg/keV; the measured phase is (144 ± 7) days and the measured period is (0.998 ± 0.002) yr, values well in agreement with those expected for DM particles. No systematic or side reaction able to mimic the exploited DM signature has been found or suggested by anyone over more than a decade. Some of the perspectives of the presently running DAMA/LIBRA-phase2 are outlined.

• OSTI ID: 22977377
• Journal Information: Physics of Particles and Nuclei, Journal Name: Physics of Particles and Nuclei Journal Issue: 2 Vol. 46; ISSN 1063-7796
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
79 ASTRONOMY AND ASTROPHYSICS
GRAN SASSO NATIONAL LABORATORY
LIQUEFIED NATURAL GAS
NONLUMINOUS MATTER
PARTICLES
SODIUM IODIDES