The Annual Modulation Signature for Dark Matter: DAMA/LIBRA-Phase1 Results and Perspectives
Figure 5
variable as a function of the energy for the total cumulative exposure 1.33 ton yr. The energy bin is 0.5 keV. A clear modulation is present in the lowest energy region, while values compatible with zero are present just above. In fact, the values in the (6–20) keV energy interval have random fluctuations around zero with equal to 35.8 for 28 degrees of freedom (upper tail probability of 15%).
