Searches for neutrinoless double beta decay, the observation of which would imply total lepton number violation and would show that neutrinos are Majorana particles require excellent energy resolution to eliminate background events that occur at energies similar to the Q-value of the decay (Qßß). The Neutrino Experiment with a Xenon Time projection chamber (TPC), in short NEXT, collaboration intends to search for this decay by using 100 kg of xenon enriched to 90% in the candidate isotope 136Xe (Qßß = 2457.8 keV). In recent years, NEXT collaboration has developed and operated several gaseous xenon TPCs, including kg-scale detectors at Lawrence Berkeley National Lab (LBNL) and at Instituto de Física Corpuscular (IFIC) and more recently the 5 kg-scale NEXT-White at the Laboratorio Subterráneo de Canfranc (LSC) in the Pyrenees.
