The NEXT double beta decay experiment

A Laing
2016 Journal of Physics, Conference Series  
NEXT (Neutrino Experiment with a Xenon TPC) is a neutrinoless doublebeta ( 0⌫) decay experiment at Laboratorio Subterráneo de Canfranc (LSC). It is an electroluminescent Time Projection Chamber filled with high pressure 136 Xe gas with separated function capabilities for calorimetry and tracking. Energy resolution and background suppression are the two key features of any neutrinoless double beta decay experiment. NEXT has both good energy resolution (< 1% FWHM) and an extra handle for
more » ... handle for background identification provided by track reconstruction. We expect a background rate of 4 ⇥ 10 4 counts keV 1 kg 1 yr 1 , and a sensitivity to the Majorana neutrino mass of between 80-160 meV (depending on NME) after a run of 3 e↵ective years of the 100 kg scale NEXT-100 detector. The initial phase of NEXT-100, called NEW, is currently being commissioned at LSC. It will validate the NEXT background rate expectations and will make first measurements of the two neutrino 2⌫ mode of 136 Xe. Furthermore, the NEXT technique can be extrapolated to the tonne scale, thus allowing the full exploration of the inverted hierarchy of neutrino masses. These proceedings review NEXT R&D results, the status of detector commissioning at LSC and the NEXT physics case.
doi:10.1088/1742-6596/718/6/062033 fatcat:nu4yfedrdrcnvkis23annrdeya