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NEXT-DEMO is a 1:4.5 scale prototype of the NEXT100 detector, a high-pressurexenon gas TPC that will search for the neutrinoless double beta decay of$^{136}$Xe. X-ray energy depositions produced by the de-excitation of Xenonatoms after the interaction of gamma rays from radioactive sources have beenused to characterize the response of the detector obtaining the spatialcalibration needed for close-to-optimal energy resolution. Our result, 5.5%FWHM at 30 keV, extrapolates to 0.6% FWHM at the Q value of $^{136}$Xe.Additionally, alpha decays from radon have been used to measure severaldetection properties and parameters of xenon gas such as electron-ionrecombination, electron drift velocity, diffusion and primary scintillationlight yield. Alpha spectroscopy is also used to quantify the activity of radoninside the detector, a potential source of background for most double betadecay experiments.

Latest results of NEXT-DEMO, the prototype of the NEXT 100 double beta decay experiment