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KamLAND-Zen is an experiment searching for the neutrinoless double beta decay (0νββ) of 136Xe nuclei with (320∼380) kg-enriched Xe using the facility of the 1,000 ton liquid scintillator (LS) detector, KamLAND. In this brief report the latest analysis results including the full data set corresponding to an exposure of 504 kg yr of 136Xe taken after the puri cation of the Xe and LS is presented. Also reported are the ongoing detector upgrade for the new phase with ∼ 750 kg of enriched Xe and the future prospect.
J. Shirai (Fri,) studied this question.