{"paper":{"title":"Limits on Majoron-emitting double-beta decays of Xe-136 in the KamLAND-Zen experiment","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["nucl-ex"],"primary_cat":"hep-ex","authors_text":"A. Kozlov, A. Obata, A. Oki, A. Suzuki, B. D. Xu, B. E. Berger, B. K. Fujikawa, D. M. Markoff, H. Hanakago, H. Ikeda, H. J. Karwowski, H. Watanabe, H. Yoshida, I. Shimizu, J. A. Detwiler, J. Shirai, KamLAND-Zen Collaboration: A. Gando, K. Han, K. Inoue, K. Nakamura, K. Tamae, K. Ueshima, M. Koga, M. P. Decowski, R. Kato, S. Enomoto, S. J. Freedman, S. Matsuda, S. Yamada, S. Yoshida, T. I. Banks, T. Mitsui, T. Nakada, T. O'Donnell, W. Tornow, Y. Efremenko, Y. Gando, Y. Ono, Y. Takemoto","submitted_at":"2012-05-29T14:24:00Z","abstract_excerpt":"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, is <g_{ee}> < (0.8 - 1.6) x 10^{-5}. This excludes a previously unconstrained region of parameter spac"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1205.6372","kind":"arxiv","version":2},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}