DAMA/LXe results on the Dark Matter

1996 & 2000 - Measurements on the direct detection of Dark Matter particles by investigating their inelastic scattering on target nuclei (producing low-lying excited nuclear states) have been carried out. In this case, the signal can be identified by the presence of characteristic peaks in the measured energy spectrum as a result of the emission of successive deexcitation gammas from the excited nuclear states.
The figure summarizes the results obtained by analysing the experimental data in the framework of a single simplified model and according to the particular modelization of PLB212(1988)375 for purely spin-dependent candidates. The limits (90% C.L.) on the relic halo density for photino, higgsino and Majorana Neutrino as a function of the particle mass are shown. Continuous lines: improved data on 2000, (exposure ~ 2500 kg x day), dashed lines our previous results on 1996 in initial configuration (823.1 kg x day).