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Decowski, S. Enomoto, S. Hayashida, S. Ishio, S. Matsuda, S. Obara, S. Yoshida, T. Hachiya, T.I. Banks, T. Ishikawa, T. Mitsui, T. O'Donnell, T. Oura, W. Tornow, Y. Efremenko, Y. Gando, Y. Shirahata, Y. Takemoto","submitted_at":"2015-09-12T09:21:31Z","abstract_excerpt":"A search for double-beta decays of 136Xe to excited states of 136Ba has been performed with the first phase data set of the KamLAND-Zen experiment. The 0+1, 2+1 and 2+2 transitions of 0{\\nu}\\{beta}\\{beta} decay were evaluated in an exposure of 89.5kg-yr of 136Xe, while the same transitions of 2{\\nu}\\{beta}\\{beta} decay were evaluated in an exposure of 61.8kg-yr. No excess over background was found for all decay modes. 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