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Featured researches published by K. Owada.


Physical Review Letters | 2005

Measurement of neutrino oscillation with KamLAND: Evidence of spectral distortion

T. Araki; K. Eguchi; S. Enomoto; K. Furuno; K. Ichimura; H. Ikeda; K. Inoue; K. Ishihara; T. Iwamoto; T. Kawashima; Y. Kishimoto; M. Koga; Y. Koseki; T. Maeda; T. Mitsui; M. Motoki; Kazuo Nakajima; H. Ogawa; K. Owada; J.-S. Ricol; I. Shimizu; J. Shirai; F. Suekane; A. Suzuki; K. Tada; O. Tajima; K. Tamae; Y. Tsuda; H. Watanabe; J. Busenitz

We present results of a study of neutrino oscillation based on a 766 ton-year exposure of KamLAND to reactor anti-neutrinos. We observe 258 \nuebar\ candidate events with energies above 3.4 MeV compared to 365.2 events expected in the absence of neutrino oscillation. Accounting for 17.8 expected background events, the statistical significance for reactor \nuebar disappearance is 99.998%. The observed energy spectrum disagrees with the expected spectral shape in the absence of neutrino oscillation at 99.6% significance and prefers the distortion expected from \nuebar oscillation effects. A two-neutrino oscillation analysis of the KamLAND data gives \DeltaMSq = 7.9


Nature | 2005

Experimental investigation of geologically produced antineutrinos with KamLAND

T. Araki; S. Enomoto; K. Furuno; Y. Gando; K. Ichimura; H. Ikeda; K. Inoue; Y. Kishimoto; M. Koga; Y. Koseki; T. Maeda; T. Mitsui; M. Motoki; Kazuo Nakajima; H. Ogawa; M. Ogawa; K. Owada; J.-S. Ricol; I. Shimizu; J. Shirai; F. Suekane; A. Suzuki; K. Tada; Sakae Takeuchi; K. Tamae; Y. Tsuda; H. Watanabe; J. Busenitz; T. Classen; Z. Djurcic

^{+0.6}_{-0.5}\times10^{-5}


Physical Review Letters | 2004

High sensitivity search for nu;e's from the sun and other sources at KamLAND.

K. Eguchi; Z. Djurcic; L. A. Winslow; T. Mitsui; K. Ishihara; Koji Inoue; S. Dazeley; Kimimasa Ikeda; P. Vogel; K. Ishii; J. A. Detwiler; H. Watanabe; P. Gorham; W. Bugg; K. Tada; C. E. Okada; A. R. Young; K. Owada; D. A. Dwyer; B. E. Berger; T. Kawashima; J. Shirai; Y.D. Chan; F. Piquemal; M. Koga; I. Shimizu; A. Kozlov; F. Suekane; B.D. Dieterle; T. Iwamoto

eV


Journal of Instrumentation | 2009

The KamLAND Full-Volume Calibration System

J. Busenitz; T. Classen; G. Elor; A. Frank; M. Galloway; F. Gray; L. Hsu; K. Ichimura; R. Kadel; G. Keefer; C. Lendvai; D. McKee; A. Piepke; D. Syversrud; J. Wallig; S. Enomoto; K. Furuno; Y. Gando; H. Ikeda; Katsuya Inoue; Y. Kibe; Y. Kishimoto; M. Koga; Y. Minekawa; T. Mitsui; Kazuo Nakajima; K. Nakamura; K. Owada; I. Shimizu; Y. Shimizu

^2


Physical Review Letters | 2006

Search for the Invisible Decay of Neutrons with KamLAND

T. Araki; S. Enomoto; K. Furuno; Y. Gando; K. Ichimura; H. Ikeda; K. Inoue; Y. Kishimoto; M. Koga; Y. Koseki; T. Maeda; T. Mitsui; M. Motoki; Kazuo Nakajima; K. Nakamura; H. Ogawa; M. Ogawa; K. Owada; J.-S. Ricol; I. Shimizu; J. Shirai; F. Suekane; A. Suzuki; K. Tada; Sakae Takeuchi; K. Tamae; Y. Tsuda; H. Watanabe; J. Busenitz; T. Classen

. A global analysis of data from KamLAND and solar neutrino experiments yields \DeltaMSq = 7.9


Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment | 2006

A simple model of reactor cores for reactor neutrino flux calculations for the KamLAND experiment

Kazuo Nakajima; K. Inoue; K. Owada; F. Suekane; Akira Suzuki; G. Hirano; S. Kosaka; T. Ohta; H. Tanaka

^{+0.6}_{-0.5}\times10^{-5}


Nuclear Physics B - Proceedings Supplements | 2002

Recent status of the KamLAND experiment

F. Suekane; K. Eguchi; S. Enomoto; K. Furuno; Y. Gando; J. Goldman; H. Hanada; H. Ikeda; Kiyohiro Ikeda; Katsuya Inoue; K. Ishihara; T. Iwamoto; T. Kawashima; Y. Kishimoto; M. Koga; Y. Koseki; T. Maeda; T. Mitsui; M. Motoki; K. Nakajima; M. Nakajima; Tatsuya Nakajima; H. Ogawa; K. Oki; K. Owada; I. Shimizu; J. Shirai; Akira Suzuki; K. Tada; O. Tajima

eV


Physical Review Letters | 2003

First Results from KamLAND: Evidence for Reactor Antineutrino Disappearance

K. Eguchi; S. Enomoto; K. Furuno; J. Goldman; H. Hanada; H. Ikeda; Kiyohiro Ikeda; Katsuya Inoue; K. Ishihara; W. Itoh; T. Iwamoto; T. Kawaguchi; T. Kawashima; H. Kinoshita; Y. Kishimoto; M. Koga; Y. Koseki; T. Maeda; T. Mitsui; M. Motoki; Kazuo Nakajima; M. Nakajima; Tatsuya Nakajima; H. Ogawa; K. Owada; T. Sakabe; I. Shimizu; J. Shirai; F. Suekane; A. Suzuki

^2


Physical Review Letters | 2008

Publisher's note: Precision measurement of neutrino oscillation parameters with KamLAND

S. Abe; T. Ebihara; S. Enomoto; K. Furuno; Y. Gando; K. Ichimura; H. Ikeda; Koji Inoue; Y. Kibe; Yasuaki Kishimoto; M. Koga; Y. Shimizu; A. Kozlov; Y. Minekawa; T. Mitsui; K. Nakajima; K. Nakamura; M. Nakamura; K. Owada; I. Shimizu; J. Shirai; F. Suekane; Akira Suzuki; Y. Takemoto; K. Tamae; A. Terashima; H. Watanabe; E. Yonezawa; S. Yoshida; J. Busenitz

and \ThetaParam = 0.40


Physical Review Letters | 2008

Publisher’s Note: Precision Measurement of Neutrino Oscillation Parameters with KamLAND [Phys. Rev. Lett.100, 221803 (2008)]

S. Abe; T. Ebihara; S. Enomoto; K. Furuno; Y. Gando; K. Ichimura; H. Ikeda; Koji Inoue; Y. Kibe; Yasuaki Kishimoto; M. Koga; Y. Shimizu; A. Kozlov; Y. Minekawa; T. Mitsui; K. Nakajima; K. Nakamura; M. Nakamura; K. Owada; I. Shimizu; J. Shirai; F. Suekane; Akira Suzuki; Y. Takemoto; K. Tamae; A. Terashima; H. Watanabe; E. Yonezawa; S. Yoshida; J. Busenitz

^{+0.10}_{-0.07}

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