Search for the invisible decay of neutrons with KamLAND.
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 -shell energy level of (12)C nuclei. Such holes could be created as a result of nucleon decay into invisible modes (inv), e.g., n--> 3v or nn--> 2v. 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: tau(n--> inv) > 5.8 x 10(29) years and tau (nn--> inv) > 1.4 x 10(30) years at 90% C.L. These results represent an improvement of factors of approximately 3 and >10(4) and over previous experiments.
Araki, T; Enomoto, S; Furuno, K; Gando, Y; Ichimura, K; Ikeda, H; Inoue, K; Kishimoto, Y; Koga, M; Koseki, Y; Maeda, T; Mitsui, T; Motoki, M; Nakajima, K; Nakamura, K; Ogawa, H; Ogawa, M; Owada, K; Ricol, J-S; Shimizu, I; Shirai, J; Suekane, F; Suzuki, A; Tada, K; Takeuchi, S; Tamae, K; Tsuda, Y; Watanabe, H; Busenitz, J; Classen, T; Djurcic, Z; Keefer, G; Leonard, DS; Piepke, A; Yakushev, E; Berger, BE; Chan, YD; Decowski, MP; Dwyer, DA; Freedman, SJ; Fujikawa, BK; Goldman, J; Gray, F; Heeger, KM; Hsu, L; Lesko, KT; Luk, K-B; Murayama, H; O'Donnell, T; Poon, AWP; Steiner, HM; Winslow, LA; Jillings, C; Mauger, C; McKeown, RD; Vogel, P; Zhang, C; Lane, CE; Miletic, T; Guillian, G; Learned, JG; Maricic, J; Matsuno, S; Pakvasa, S; Horton-Smith, GA; Dazeley, S; Hatakeyama, S; Rojas, A; Svoboda, R; Dieterle, BD; Detwiler, J; Gratta, G; Ishii, K; Tolich, N; Uchida, Y; Batygov, M; Bugg, W; Efremenko, Y; Kamyshkov, Y; Kozlov, A; Nakamura, Y; Karwowski, HJ; Markoff, DM; Rohm, RM; Tornow, W; Wendell, R; Chen, M-J; Wang, Y-F; Piquemal, F; KamLAND Collaboration,
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