The 136Xe 2νββ half-life is measured as (2.14 ± 0.05) × 10^21 years with ξ31^{2ν} = 0.59^{+0.41}_{-0.38}, plus the most stringent limit on the n=7 Majoron mode.
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Precise $^{136}$Xe Double Beta Decay Measurement in PandaX-4T with Implications on the Nuclear Matrix Elements and Majorons
The 136Xe 2νββ half-life is measured as (2.14 ± 0.05) × 10^21 years with ξ31^{2ν} = 0.59^{+0.41}_{-0.38}, plus the most stringent limit on the n=7 Majoron mode.