Search for the invisible decay of neutrons with KamLAND

T. Araki, S. Enomoto, K. Furuno, Y. Gando, K. Ichimura, H. Ikeda, K. Inoue, Y. Kishimoto, M. Koga, Y. Koseki, T. Maeda, T. Mitsui, M. Motoki, K. Nakajima, K. Nakamura, H. Ogawa, M. Ogawa, K. Owada, J. S. Ricol, I. ShimizuJ. Shirai, F. Suekane, A. Suzuki, K. Tada, S. Takeuchi, K. Tamae, Y. Tsuda, H. Watanabe, J. Busenitz, T. Classen, Z. Djurcic, G. Keefer, D. S. Leonard, A. Piepke, E. Yakushev, B. E. Berger, Y. D. Chan, M. P. Decowski, D. A. Dwyer, S. J. Freedman, B. K. Fujikawa, J. Goldman, F. Gray, K. M. Heeger, L. Hsu, K. T. Lesko, K. B. Luk, H. Murayama, T. O'Donnell, A. W.P. Poon, H. M. Steiner, L. A. Winslow, C. Jillings, C. Mauger, R. D. McKeown, P. Vogel, C. Zhang, C. E. Lane, T. Miletic, G. Guillian, J. G. Learned, J. Maricic, S. Matsuno, S. Pakvasa, G. A. Horton-Smith, S. Dazeley, S. Hatakeyama, A. Rojas, R. Svoboda, B. D. Dieterle, J. Detwiler, G. Gratta, K. Ishii, N. Tolich, Y. Uchida, M. Batygov, W. Bugg, Y. Efremenko, Y. Kamyshkov, A. Kozlov, Y. Nakamura, H. J. Karwowski, D. M. Markoff, R. M. Rohm, W. Tornow, R. Wendell, M. J. Chen, Y. F. Wang, F. Piquemal

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49 Citations (Scopus)


The Kamioka Liquid scintillator Anti-Neutrino Detector is used in a search for single neutron or two-neutron intranuclear disappearance that would produce holes in the s-shell energy level of C12 nuclei. Such holes could be created as a result of nucleon decay into invisible modes (inv), e.g., n→3ν or nn→2ν. The deexcitation of the corresponding daughter nucleus results in a sequence of space and time-correlated events observable in the liquid scintillator detector. We report on new limits for one- and two-neutron disappearance: τ(n→inv)>5.8×1029 years and τ(nn→inv)>1.4×1030 years at 90% C.L. These results represent an improvement of factors of ∼3 and >104 over previous experiments.

Original languageEnglish
Article number101802
JournalPhysical Review Letters
Issue number10
Publication statusPublished - 2006


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