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We present limits on Majoron-emitting neutrinoless double-beta decay modesbased on an exposure of 112.3 days with 125 kg of Xe-136. In particular, alower limit on the ordinary (spectral index n = 1) Majoron-emitting decayhalf-life of Xe-136 is obtained as T_{1/2}^{0\nu\chi^{0}} > 2.6 x 10^{24} yr at90% C.L., a factor of five more stringent than previous limits. Thecorresponding upper limit on the effective Majoron-neutrino coupling, using arange of available nuclear matrix calculations, is <g_{ee}> < (0.8 - 1.6) x10^{-5}. This excludes a previously unconstrained region of parameter space andstrongly limits the possible contribution of ordinary Majoron emission modes to0\nu\beta\beta decay for neutrino masses in the inverted hierarchy scheme.

Limits on Majoron-emitting double-beta decays of Xe-136 in the KamLAND-Zen experiment