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Search for the invisible decay of neutrons with KamLAND |
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| Authors: | 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 D S Piepke A Yakushev E Berger B E Chan Y D Decowski M P Dwyer D A Freedman S J Fujikawa B K Goldman J Gray F Heeger K M Hsu L Lesko K T Luk K-B Murayama H O'Donnell T Poon A W P Steiner H M Winslow L A Jillings C Mauger C McKeown R D Vogel P Zhang C Lane C E Miletic T Guillian G Learned J G |
| Institution: | Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan. |
| Abstract: | 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. |
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