pnQRPA, shell model, IBM-2, and heavy-nucleus EFT give mutually consistent 2ν half-life ranges for 126Xe ECEC and 134Xe ββ, with 134Xe lower bounds below ~2×10^24 y.
Al Kharusi (EXO-200 collaboration), et al., Search for double beta decays of 134Xewith EXO-200 Phase II, Phys
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Two-neutrino double-weak decays of $^{126}$Xe and $^{134}$Xe from different many-body methods
pnQRPA, shell model, IBM-2, and heavy-nucleus EFT give mutually consistent 2ν half-life ranges for 126Xe ECEC and 134Xe ββ, with 134Xe lower bounds below ~2×10^24 y.