* CUORE (Cryogenic Underground Observatory for Rare Events) experiment:
**  The CUORE experiment consists of an array of 988 ultra-cold TeO crystals (for a total mass of 206 kg of ) used as bolometers to detect the emitted beta particles and as the source of the decay. CUORE is located underground at the Laboratori Nazionali del Gran Sasso, and it began its first physics data run in 2017. CUORE published in 2020 results from the search for neutrinoless double-beta decay in  with a total exposure of 372.5 kg⋅yr, finding no evidence for 0νββ decay and setting a 90% CI Bayesian lower limit of  years and in April 2022 a new limit was set on  years at the same confidence level. The experiment is steadily taking data, and it is expected to finalize its physics program by 2024.
* KamLAND-Zen (Kamioka Liquid Scintillator Antineutrino Detector-Zen) experiment:
** The KamLAND-Zen experiment commenced using 13 tons of xenon as a source (enriched with about 320 kg of ), contained in a nylon balloon that is surrounded by a liquid scintillator outer balloon of 13 m diameter. Starting in 2011, KamLAND-Zen Phase I started taking data, eventually leading to set a limit on the lifetime for neutrinoless double beta decay of  years (90% C.L.). This limit could be improved by combining with Phase II data (data-taking started in December 2013) to  years (90% C.L.). For Phase II, the collaboration especially managed to reduce the decay of , which disturbed the measurements in the region of interest for 0νββ decay of . In August 2016, KamLAND-Zen 800 was completed containing 800 kg of , reporting a limit of  years (90% C.L.). In 2023 the limit was improved limit of  years (90% C.L.).