ARAKI, T.; ENOMOTO, S.; FURUNO, K.; GANDO, Y.; ICHIMURA, K.; IKEDA, H.; INOUE, K.; KISHIMOTO, Y.; KOGA, M.; KOSEKI, Y.; MAEDA, T.; T. MITSUI, 1; MOTOKI, M.; NAKAJIMA, K.; NAKAMURA, K.; OGAWA, H.; OGAWA, M.; OWADA, K.; RICOL, J.-S.; SHIMIZU, I.; J. SHIRAI, 1; F. SUEKANE, 1; SUZUKI, A.; K. TADA, 1; S. TAKEUCHI, 1; TAMAE, K.; TSUDA, Y.; WATANABE, H.; BUSENITZ, J.; CLASSEN, T.; DJURCIC, Z.; KEEFER, G.; S. LEONARD, D.; PIEPKE, A.; YAKUSHEV, E.; E. BERGER, B.; D. CHAN, Y.; P. DECOWSKI, M.; DWYER, D.A.; J. FREEDMAN, S.; K. FUJIKAWA, B.; GOLDMAN, J.; GRAY, F.; M. HEEGER, K.; HSU, L.; T. LESKO, K.; LUK, K.-B.; MURAYAMA, H.; O'DONNELL, T.; W. P. POON, A.; M. STEINER, H.; A. WINSLOW, L.; JILLINGS, C.; MAUGER, C.; D. MCKEOWN, R.; VOGEL, P.; ZHANG, C.; E. LANE, C.; MILETIC, T.; GUILLIAN, G.; G. LEARNED, J.; MARICIC, J.; MATSUNO, S.; PAKVASA, S.; A. HORTON-SMITH, G.; DAZELEY, S.; HATAKEYAMA, S.; ROJAS, A.; SVOBODA, R.; D. DIETERLE, B.; DETWILER, J.; GRATTA, G.; ISHII, K.; TOLICH, N.; UCHIDA, Y.; BATYGOV, M.; BUGG, W.; EFREMENKO, Y.; KAMYSHKOV, Y.; KOZLOV, A.; NAKAMURA, Y.; J. KARWOWSKI, H.; M. MARKOFF, D.; M. ROHM, R.; TORNOW, W.; WENDELL, R.; CHEN, M.-J.; WANG, Y.-F.; PIQUEMAL, F.

doi:10.1103/PhysRevLett.96.101802

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Physical Review Letters. 2006, vol. 96, p. 101802

American Physical Society

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The Kamioka Liquid scintillator Anti-Neutrino Detector (KamLAND) is used in a search for single neutron or two neutron intra-nuclear disappearance that would produce holes in the $\it{s}$-shell energy level of $^{12}$C nuclei. Such holes could be created as a result of nucleon decay into invisible modes ($inv$), e.g. $n \to 3\nu$ or $nn \to 2\nu$. The de-excitation 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: $\tau(n\to inv)> 5.8\times 10^{29}$ years and $\tau (nn \to inv)> 1.4 \times 10^{30}$ years at 90% CL. These results represent an improvement of factors of $\sim$3 and $>10^4$ over previous experiments.< Réduire

Mots clés en anglais

leptonic decay neutrino

multiple production n

bound state carbon

excited nucleus excited nucleus

decay correlation lifetime

lower limit scintillation counter

liquid experimental results deep underground detector

KamLAND

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Search for the Invisible Decay of Neutrons with KamLAND

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