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Featured researches published by I. Shimizu.


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


Physical Review Letters | 2012

Proposal for an electron antineutrino disappearance search using high-rate 8Li production and decay.

Adriana Bungau; Andreas Adelmann; Jose Alonso; William A. Barletta; Roger Barlow; Larry Bartoszek; L. Calabretta; Alessandra Calanna; Daniel Campo; J. M. Conrad; Z. Djurcic; Y. Kamyshkov; M. H. Shaevitz; I. Shimizu; Tess Smidt; J. Spitz; M. O. Wascko; L. Winslow; Jing Yang

^2


Physical Review C | 2012

Limits on Majoron-emitting double-β decays of 136Xe in the KamLAND-Zen experiment

A. Gando; Y. Gando; H. Hanakago; H. Ikeda; Katsuya Inoue; R. Kato; M. Koga; S. Matsuda; T. Mitsui; T. Nakada; Ko Nakamura; A. Obata; A. Oki; Y. Ono; I. Shimizu; J. Shirai; A. Suzuki; Y. Takemoto; K. Tamae; K. Ueshima; H. Watanabe; B. D. Xu; S. Yamada; H. Yoshida; A. Kozlov; S. Yoshida; T. I. Banks; J. A. Detwiler; Stuart J. Freedman; B. K. Fujikawa

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


The Astrophysical Journal | 2012

SEARCH FOR EXTRATERRESTRIAL ANTINEUTRINO SOURCES WITH THE KamLAND DETECTOR

A. Gando; Y. Gando; K. Ichimura; H. Ikeda; K. Inoue; Y. Kibe; Y. Kishimoto; M. Koga; Y. Minekawa; T. Mitsui; T. Morikawa; N. Nagai; Kazuo Nakajima; K. Nakamura; K. Narita; I. Shimizu; Y. Shimizu; J. Shirai; F. Suekane; A. Suzuki; H. Takahashi; N. Takahashi; Y. Takemoto; K. Tamae; H. Watanabe; B. D. Xu; H. Yabumoto; H. Yoshida; Shijun Yoshida; S. Enomoto

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


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

eV


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

^2


XXVI INTERNATIONAL CONFERENCE ON NEUTRINO PHYSICS AND ASTROPHYSICS: Neutrino 2014 | 2015

Results from KamLAND-Zen

K. Asakura; A. Gando; Y. Gando; T. Hachiya; S. Hayashida; H. Ikeda; K. Inoue; K. Ishidoshiro; T. Ishikawa; S. Ishio; M. Koga; R. Matsuda; S. Matsuda; T. Mitsui; D. Motoki; K. Nakamura; S. Obara; Y. Oki; M. Otani; T. Oura; I. Shimizu; Y. Shirahata; J. Shirai; A. Suzuki; H. Tachibana; K. Tamae; K. Ueshima; H. Watanabe; B. D. Xu; Y. Yamauchi

and \ThetaParam = 0.40


Physical Review D | 2014

Precision ν ̄ e -electron scattering measurements with IsoDAR to search for new physics PRECISION ν ̄ e -electron scattering ⋯ J.M. CONRAD et al.

J. M. Conrad; M. H. Shaevitz; I. Shimizu; J. Spitz; M. Toups; L. A. Winslow

^{+0.10}_{-0.07}

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