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Search for the Invisible Decay of Neutrons with KamLAND

Abstract : 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.
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Contributor : Pascale Chambon <>
Submitted on : Monday, October 16, 2006 - 4:54:19 PM
Last modification on : Thursday, January 11, 2018 - 6:12:50 AM

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T. Araki, S. Enomoto, K. Furuno, Y. Gando, K. Ichimura, et al.. Search for the Invisible Decay of Neutrons with KamLAND. Physical Review Letters, American Physical Society, 2006, 96, pp.101802. ⟨10.1103/PhysRevLett.96.101802⟩. ⟨in2p3-00106933⟩



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