title: Search for the invisible decay of neutrons with KamLAND.
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.
authors.affiliation: Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Araki
authors.forename: S
authors.initials: S
authors.lastname: Enomoto
authors.forename: K
authors.initials: K
authors.lastname: Furuno
authors.forename: Y
authors.initials: Y
authors.lastname: Gando
authors.forename: K
authors.initials: K
authors.lastname: Ichimura
authors.forename: H
authors.initials: H
authors.lastname: Ikeda
authors.forename: K
authors.initials: K
authors.lastname: Inoue
authors.forename: Y
authors.initials: Y
authors.lastname: Kishimoto
authors.forename: M
authors.initials: M
authors.lastname: Koga
authors.forename: Y
authors.initials: Y
authors.lastname: Koseki
authors.forename: T
authors.initials: T
authors.lastname: Maeda
authors.forename: T
authors.initials: T
authors.lastname: Mitsui
authors.forename: M
authors.initials: M
authors.lastname: Motoki
authors.forename: K
authors.initials: K
authors.lastname: Nakajima
authors.forename: K
authors.initials: K
authors.lastname: Nakamura
authors.forename: H
authors.initials: H
authors.lastname: Ogawa
authors.forename: M
authors.initials: M
authors.lastname: Ogawa
authors.forename: K
authors.initials: K
authors.lastname: Owada
authors.forename: J-S
authors.initials: JS
authors.lastname: Ricol
authors.forename: I
authors.initials: I
authors.lastname: Shimizu
authors.forename: J
authors.initials: J
authors.lastname: Shirai
authors.forename: F
authors.initials: F
authors.lastname: Suekane
authors.forename: A
authors.initials: A
authors.lastname: Suzuki
authors.forename: K
authors.initials: K
authors.lastname: Tada
authors.forename: S
authors.initials: S
authors.lastname: Takeuchi
authors.forename: K
authors.initials: K
authors.lastname: Tamae
authors.forename: Y
authors.initials: Y
authors.lastname: Tsuda
authors.forename: H
authors.initials: H
authors.lastname: Watanabe
authors.forename: J
authors.initials: J
authors.lastname: Busenitz
authors.forename: T
authors.initials: T
authors.lastname: Classen
authors.forename: Z
authors.initials: Z
authors.lastname: Djurcic
authors.forename: G
authors.initials: G
authors.lastname: Keefer
authors.forename: D S
authors.initials: DS
authors.lastname: Leonard
authors.forename: A
authors.initials: A
authors.lastname: Piepke
authors.forename: E
authors.initials: E
authors.lastname: Yakushev
authors.forename: B E
authors.initials: BE
authors.lastname: Berger
authors.forename: Y D
authors.initials: YD
authors.lastname: Chan
authors.forename: M P
authors.initials: MP
authors.lastname: Decowski
authors.forename: D A
authors.initials: DA
authors.lastname: Dwyer
authors.forename: S J
authors.initials: SJ
authors.lastname: Freedman
authors.forename: B K
authors.initials: BK
authors.lastname: Fujikawa
authors.forename: J
authors.initials: J
authors.lastname: Goldman
authors.forename: F
authors.initials: F
authors.lastname: Gray
authors.forename: K M
authors.initials: KM
authors.lastname: Heeger
authors.forename: L
authors.initials: L
authors.lastname: Hsu
authors.forename: K T
authors.initials: KT
authors.lastname: Lesko
authors.forename: K-B
authors.initials: KB
authors.lastname: Luk
authors.forename: H
authors.initials: H
authors.lastname: Murayama
authors.forename: T
authors.initials: T
authors.lastname: O'Donnell
authors.forename: A W P
authors.initials: AW
authors.lastname: Poon
authors.forename: H M
authors.initials: HM
authors.lastname: Steiner
authors.forename: L A
authors.initials: LA
authors.lastname: Winslow
authors.forename: C
authors.initials: C
authors.lastname: Jillings
authors.forename: C
authors.initials: C
authors.lastname: Mauger
authors.forename: R D
authors.initials: RD
authors.lastname: McKeown
authors.forename: P
authors.initials: P
authors.lastname: Vogel
authors.forename: C
authors.initials: C
authors.lastname: Zhang
authors.forename: C E
authors.initials: CE
authors.lastname: Lane
authors.forename: T
authors.initials: T
authors.lastname: Miletic
authors.forename: G
authors.initials: G
authors.lastname: Guillian
authors.forename: J G
authors.initials: JG
authors.lastname: Learned
authors.forename: J
authors.initials: J
authors.lastname: Maricic
authors.forename: S
authors.initials: S
authors.lastname: Matsuno
authors.forename: S
authors.initials: S
authors.lastname: Pakvasa
authors.forename: G A
authors.initials: GA
authors.lastname: Horton-Smith
authors.forename: S
authors.initials: S
authors.lastname: Dazeley
authors.forename: S
authors.initials: S
authors.lastname: Hatakeyama
authors.forename: A
authors.initials: A
authors.lastname: Rojas
authors.forename: R
authors.initials: R
authors.lastname: Svoboda
authors.forename: B D
authors.initials: BD
authors.lastname: Dieterle
authors.forename: J
authors.initials: J
authors.lastname: Detwiler
authors.forename: G
authors.initials: G
authors.lastname: Gratta
authors.forename: K
authors.initials: K
authors.lastname: Ishii
authors.forename: N
authors.initials: N
authors.lastname: Tolich
authors.forename: Y
authors.initials: Y
authors.lastname: Uchida
authors.forename: M
authors.initials: M
authors.lastname: Batygov
authors.forename: W
authors.initials: W
authors.lastname: Bugg
authors.forename: Y
authors.initials: Y
authors.lastname: Efremenko
authors.forename: Y
authors.initials: Y
authors.lastname: Kamyshkov
authors.forename: A
authors.initials: A
authors.lastname: Kozlov
authors.forename: Y
authors.initials: Y
authors.lastname: Nakamura
authors.forename: H J
authors.initials: HJ
authors.lastname: Karwowski
authors.forename: D M
authors.initials: DM
authors.lastname: Markoff
authors.forename: R M
authors.initials: RM
authors.lastname: Rohm
authors.forename: W
authors.initials: W
authors.lastname: Tornow
authors.forename: R
authors.initials: R
authors.lastname: Wendell
authors.forename: M-J
authors.initials: MJ
authors.lastname: Chen
authors.forename: Y-F
authors.initials: YF
authors.lastname: Wang
authors.forename: F
authors.initials: F
authors.lastname: Piquemal