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Limits on Majoron-emitting double-βdecays of136Xe in the KamLAND-Zen experiment

2012
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Physical Review C
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We present limits on Majoron-emitting neutrinoless double-beta decay modes based on an exposure of 112.3 days with 125 kg of Xe-136. In particular, a lower limit on the ordinary (spectral index n = 1) Majoron-emitting decay half-life of Xe-136 is obtained as T_{1/2}^{0\nu\chi^{0}} > 2.6 x 10^{24} yr at 90% C.L., a factor of five more stringent than previous limits. The corresponding upper limit on the effective Majoron-neutrino coupling, using a range of available nuclear matrix calculations,

doi:10.1103/physrevc.86.021601
fatcat:gnddk726tvajtg26xkxty3fawe