![]() ![]() This design provides the best possible energy resolution compared with other NEXT designs based on avalanche gain devices. We propose the use of SiPMs (MPPCs) coated with a suitable wavelength shifter for the tracking, and the use of radiopure photomultipliers for the measurement of the energy and the primary scintillation needed to estimate the t0. The SOFT design uses different sensors for tracking and calorimetry. The design described here optimizes energy resolution thanks to the use of proportional electroluminescent amplification (EL) it is compact, as the Xe gas is under high pressure and it allows the measurement of the topological signature of the event to further reduce the background contamination. In addition, it needs to be operational as soon as possible. ![]() This requires a detector with very good energy resolution (<1%), very low background con- tamination (1E-4 counts/(keV \bullet kg \bullet y)) and large target mass. Our experiment must be competitive with the new generation of bb0nu searches already in operation or in construction. We propose an EASY (Electroluminescent ApparatuS of high Yield) and SOFT (Separated Optimized FuncTion) time-projection chamber for the NEXT experiment, that will search for neutrinoless double beta decay (bb0nu) in Xe-136. ![]()
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