The search for neutrinoless double beta decays with the NEXT experiments

Establishing the Majorana nature of neutrino masses would have a significant impact on many fields of physics, and the only viable experimental method to do it is through the search of neutrinoless double beta decays (0nubb). Worldwide, experiments are searching for this extremely rare process using different isotopes and detection techniques. The NEXT collaboration is using an innovative technique: a high-pressure xenon gas time projection chamber using electroluminescence amplification. The NEXT program finished at the end of 2021 the NEXT-White (NEW) experimental phase, a detector of 10 kg of ¹³⁶Xe located at the Laboratorio Subterraneo de Canfranc (Spain). NEW results have demonstrated the reliability in the performance of this type of technology, and provided a crosscheck of the NEXT background model. The next phase of the NEXT program is now underway with the construction of NEXT-100, a 100 kg detector that aims to demonstrate the scalability of this technology, and will reach sensitivities competitive with the current generation of experiments. In this talk, the most recent results obtained with the NEW detector, and the current status of the NEXT-100 construction will be presented, together with prospects of a NEXT tonne-scale generation that is expected to reach a half-life sensitivity of 1.2x10²⁷ years (90% CL) for the 0nubb process in less than 10 years of operation.