Search for the Majorana Nature of Neutrinos in the Inverted Mass Ordering Region with KamLAND-Zen

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The KamLAND-Zen experiment has provided stringent constraints on the neutrinoless double-beta (0⁢𝜈⁢𝛽⁢𝛽) decay half-life in 136 Xe using a xenon-loaded liquid scintillator. We report an improved search using an upgraded detector with almost double the amount of xenon and an ultralow radioactivity container, corresponding to an exposure of 970 kg yr of 136 Xe. These new data provide valuable insight into backgrounds, especially from cosmic muon spallation of xenon, and have required the use of novel background rejection techniques. We obtain a lower limit for the 0⁢𝜈⁢𝛽⁢𝛽 decay half-life of 𝑇0⁢𝜈1/2 >2.3 ×1026 yr at 90% C.L., corresponding to upper limits on the effective Majorana neutrino mass of 36–156 meV using commonly adopted nuclear matrix element calculations.

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