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We present the design, data and results from the NEXT prototype for DoubleBeta and Dark Matter (NEXT-DBDM) detector, a high-pressure gaseous naturalxenon electroluminescent time projection chamber (TPC) that was built at theLawrence Berkeley National Laboratory. It is a prototype of the plannedNEXT-100 $^{136}$Xe neutrino-less double beta decay ($0\nu\beta\beta$)experiment with the main objectives of demonstrating near-intrinsic energyresolution at energies up to 662 keV and of optimizing the NEXT-100 detectordesign and operating parameters. Energy resolutions of $\sim$1% FWHM for 662keV gamma rays were obtained at 10 and 15 atm and $\sim$5% FWHM for 30 keVfluorescence xenon X-rays. These results demonstrate that 0.5% FWHM resolutionsfor the 2,459 keV hypothetical neutrino-less double beta decay peak arerealizable. This energy resolution is a factor 7 to 20 better than that of thecurrent leading $0\nu\beta\beta$ experiments using liquid xenon and thusrepresents a significant advancement. We present also first results from atrack imaging system consisting of 64 silicon photo-multipliers recentlyinstalled in NEXT-DBDM that, along with the excellent energy resolution,demonstrates the key functionalities required for the NEXT-100 $0\nu\beta\beta$search.

Near-Intrinsic Energy Resolution for 30 to 662 keV Gamma Rays in a High Pressure Xenon Electroluminescent TPC