Final model independent result of DAMA/LIBRA–phase1

The European Physical Journal C

F. Cappella¹  D. Prosperi¹  A. d’Angelo¹  S. d’Angelo²  R. Bernabei²  A. Di Marco²  R. G. Wang³  C. J. Dai³  X. H. Ma³  X. D. Sheng³  H. H. Kuang³  H. L. He³  Z. P. Ye⁴  P. Belli⁵  F. Montecchia⁶  S. Castellano⁷  R. Cerulli⁷  V. Caracciolo⁷  A. Incicchitti⁸ 

[1] Dipartimento di Fisica, Università di Roma “La Sapienza”, 00185, Rome, Italy;sez. Roma, INFN, 00185, Rome, Italy;Dipartimento di Fisica, Università di Roma “Tor Vergata”, 00133, Rome, Italy;INFN, sez. Roma “Tor Vergata”, 00133, Rome, Italy;IHEP, Chinese Academy, P.O. Box 918/3, 100039, Beijing, China;IHEP, Chinese Academy, P.O. Box 918/3, 100039, Beijing, China;University of Jing Gangshan, Jiangxi, China;INFN, sez. Roma “Tor Vergata”, 00133, Rome, Italy;INFN, sez. Roma “Tor Vergata”, 00133, Rome, Italy;Dipartimento di Ingegneria Civile e Ingegneria Informatica, Università di Roma “Tor Vergata”, Rome, Italy;Laboratori Nazionali del Gran Sasso, INFN, Assergi, Italy;sez. Roma, INFN, 00185, Rome, Italy;

关键词: Dark Matter;    Annual Cycle;    Dark Matter Particle;    Galactic Halo;    Residual Rate;   

DOI  :  10.1140/epjc/s10052-013-2648-7

来源: Springer

【 摘 要 】

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 (i.e. adding a further 0.17 ton × yr exposure) are presented. The DAMA/LIBRA–phase1 data give evidence 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, at 7.5σ C.L. Including also the first generation DAMA/NaI experiment (cumulative exposure 1.33 ton × yr, corresponding to 14 annual cycles), the C.L. is 9.3σ and 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.

【 授权许可】

CC BY