title: Limit on neutrinoless ββ decay of 136Xe from the first phase of KamLAND-Zen and comparison with the positive claim in 76Ge.
abstract: We present results from the first phase of the KamLAND-Zen double-beta decay experiment, corresponding to an exposure of 89.5 kg yr of (136)Xe. We obtain a lower limit for the neutrinoless double-beta decay half-life of T(1/2)(0ν)>1.9×10(25) yr at 90% C.L. The combined results from KamLAND-Zen and EXO-200 give T(1/2)(0ν)>3.4×10(25) yr at 90% C.L., which corresponds to a Majorana neutrino mass limit of <m(ββ)> <(120-250) meV based on a representative range of available matrix element calculations. Using those calculations, this result excludes the Majorana neutrino mass range expected from the neutrinoless double-beta decay detection claim in (76)Ge, reported by a part of the Heidelberg-Moscow Collaboration, at more than 97.5% C.L.
authors: Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan.
authors: A
authors: A
authors: Gando
authors: Y
authors: Y
authors: Gando
authors: H
authors: H
authors: Hanakago
authors: H
authors: H
authors: Ikeda
authors: K
authors: K
authors: Inoue
authors: K
authors: K
authors: Ishidoshiro
authors: R
authors: R
authors: Kato
authors: M
authors: M
authors: Koga
authors: S
authors: S
authors: Matsuda
authors: T
authors: T
authors: Mitsui
authors: D
authors: D
authors: Motoki
authors: T
authors: T
authors: Nakada
authors: K
authors: K
authors: Nakamura
authors: A
authors: A
authors: Obata
authors: A
authors: A
authors: Oki
authors: Y
authors: Y
authors: Ono
authors: M
authors: M
authors: Otani
authors: I
authors: I
authors: Shimizu
authors: J
authors: J
authors: Shirai
authors: A
authors: A
authors: Suzuki
authors: Y
authors: Y
authors: Takemoto
authors: K
authors: K
authors: Tamae
authors: K
authors: K
authors: Ueshima
authors: H
authors: H
authors: Watanabe
authors: B D
authors: BD
authors: Xu
authors: S
authors: S
authors: Yamada
authors: H
authors: H
authors: Yoshida
authors: A
authors: A
authors: Kozlov
authors: S
authors: S
authors: Yoshida
authors: T I
authors: TI
authors: Banks
authors: S J
authors: SJ
authors: Freedman
authors: B K
authors: BK
authors: Fujikawa
authors: K
authors: K
authors: Han
authors: T
authors: T
authors: O'Donnell
authors: B E
authors: BE
authors: Berger
authors: Y
authors: Y
authors: Efremenko
authors: H J
authors: HJ
authors: Karwowski
authors: D M
authors: DM
authors: Markoff
authors: W
authors: W
authors: Tornow
authors: J A
authors: JA
authors: Detwiler
authors: S
authors: S
authors: Enomoto
authors: M P
authors: MP
authors: Decowski