Recent results from NEXT-White, a demonstrator for the NEXT neutrinoless double beta decay experiment

The NEXT (Neutrino Experiment with a Xenon TPC) experiment will search for neutrinoless double beta (0νββ) decay from ¹³⁶Xe using a high pressure xenon gas time projection chamber. This detector technology has several key advantages, including excellent energy resolution and powerful event classification based on track topology. The current stage of the experiment, the NEXT-White detector, has been acquiring data at Canfranc Underground Laboratory (LSC) in Spain to demonstrate the NEXT capabilities. After reviewing the experiment, we describe the process of calibration using 83^mKr, demonstrating the effectiveness of correcting for spatial and temporal variations in the detector, and progress towards sub-1% energy resolution at the ¹³⁶Xe double-beta decay Q-value. We also present recent results on background contamination and energy resolution.

NEXT acknowledges support from: the European Research Council, the European Union's Framework Programme for Research and Innovation Horizon, the Ministerio de Economía y Competitividad of Spain, the Severo Ochoa Program and the María de Maetzu Program, the GVA of Spain, the Portuguese FCT, the U.S. Department of Energy, and the University of Texas at Arlington, the Laboratorio Subterráneo de Canfranc for hosting the experiment.