K
K. Nakajima
Researcher at Niigata University
Publications - 32
Citations - 7971
K. Nakajima is an academic researcher from Niigata University. The author has contributed to research in topics: Neutrino oscillation & Neutrino. The author has an hindex of 19, co-authored 19 publications receiving 7522 citations. Previous affiliations of K. Nakajima include Okayama University & Tohoku University.
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Journal ArticleDOI
First results from KamLAND: evidence for reactor antineutrino disappearance.
K. Eguchi,Sanshiro Enomoto,K. Furuno,J. Goldman,H. Hanada,H. Ikeda,Kiyohiro Ikeda,Kunio Inoue,K. Ishihara,W. Itoh,T. Iwamoto,Tomoya Kawaguchi,T. Kawashima,H. Kinoshita,Yasuhiro Kishimoto,M. Koga,Y. Koseki,T. Maeda,T. Mitsui,M. Motoki,K. Nakajima,M. Nakajima,T. Nakajima,Hiroshi Ogawa,K. Owada,T. Sakabe,I. Shimizu,J. Shirai,F. Suekane,A. Suzuki,K. Tada,Osamu Tajima,T. Takayama,K. Tamae,Hideki Watanabe,J. Busenitz,Z. Djurcic,K. McKinny,Dongming Mei,A. Piepke,E. Yakushev,B. E. Berger,Y. D. Chan,M. P. Decowski,D. A. Dwyer,Stuart J. Freedman,Y. Fu,B. K. Fujikawa,K. M. Heeger,K. T. Lesko,K. B. Luk,Hitoshi Murayama,D. R. Nygren,C. E. Okada,A. W. P. Poon,H. M. Steiner,Lindley Winslow,G. A. Horton-Smith,R. D. McKeown,J. Ritter,B. Tipton,Petr Vogel,C. E. Lane,T. Miletic,Peter Gorham,G. Guillian,John G. Learned,J. Maricic,S. Matsuno,Sandip Pakvasa,S. Dazeley,S. Hatakeyama,M. Murakami,R. Svoboda,B. D. Dieterle,M. DiMauro,J. A. Detwiler,Giorgio Gratta,K. Ishii,N. Tolich,Y. Uchida,M. Batygov,W. M. Bugg,H. O. Cohn,Yuri Efremenko,Yuri Kamyshkov,A. Kozlov,Y. Nakamura,L. De Braeckeleer,L. De Braeckeleer,C. R. Gould,C. R. Gould,Hugon J Karwowski,Hugon J Karwowski,D. M. Markoff,D. M. Markoff,J. A. Messimore,J. A. Messimore,Koji Nakamura,Koji Nakamura,Ryan Rohm,Ryan Rohm,Werner Tornow,Werner Tornow,Albert Young,Albert Young,Y. F. Wang +106 more
TL;DR: In the context of two-flavor neutrino oscillations with CPT invariance, all solutions to the solar neutrinos problem except for the "large mixing angle" region are excluded.
Journal ArticleDOI
Indication of Electron Neutrino Appearance from an Accelerator-produced Off-axis Muon Neutrino Beam
K. Abe,N. Abgrall,Yasuo Ajima,Hiroaki Aihara,Justin Albert,C. Andreopoulos,B. Andrieu,Shigeki Aoki,O. Araoka,J. Argyriades,Akitaka Ariga,Tomoko Ariga,S. Assylbekov,D. Autiero,A. Badertscher,M. Barbi,Gareth J. Barker,G.D. Barr,M. Bass,F. Bay,S. W. Bentham,Vincenzo Berardi,B. E. Berger,Iain Alexander Bertram,M. Besnier,J. Beucher,Dmitriy Beznosko,S. Bhadra,F. d. M. Blaszczyk,A. Blondel,C. Bojechko,J. Bouchez,S. B. Boyd,A. Bravar,C. Bronner,D. G. Brook-Roberge,N. J. Buchanan,Hs Budd,David Calvet,S. L. Cartwright,A. Carver,R. Castillo,M. G. Catanesi,A. Cazes,A. Cervera,C. A. Chavez,Steve K. Choi,G. Christodoulou,J. P. Coleman,W. Coleman,G. Collazuol,K. Connolly,A. Curioni,A. Dabrowska,I. Z. Danko,Rhiju Das,Gavin Davies,Scott Davis,M. Day,G. De Rosa,J. P.A.M. De André,P. de Perio,A. Delbart,C. Densham,F. Di Lodovico,S. Di Luise,P. Dinh Tran,J. Dobson,U. Dore,O. Drapier,Frédéric Dufour,J. Dumarchez,S. Dytman,Michal Dziewiecki,M. Dziomba,S. W. K. Emery,Antonio Ereditato,L. Escudero,Luigi Salvatore Esposito,M. Fechner,A. Ferrero,Alexander Finch,E. Frank,Y. Fujii,Y. Fukuda,V. Galymov,Fred Gannaway,A. Gaudin,A. Gendotti,M. A. George,S. Giffin,C. Giganti,K. Gilje,T. Golan,M. Goldhaber,J. J. Gomez-Cadenas,M. Gonin,N. Grant,Alastair Grant,P. Gumplinger,P. Guzowski,A. Haesler,M. D. Haigh,K. Hamano,C. Hansen,D. Hansen,T. Hara,Paul Fraser Harrison,B. Hartfiel,M. Hartz,M. Hartz,Tomiyoshi Haruyama,T. Hasegawa,N. C. Hastings,S. Hastings,A. Hatzikoutelis,K. Hayashi,Yoshinari Hayato,C. Hearty,R. L. Helmer,Robert Henderson,Norio Higashi,Joshua Hignight,Eiichi Hirose,J. Holeczek,S. Horikawa,A. Hyndman,A. K. Ichikawa,K. Ieki,M. Ieva,M. Iida,M. Ikeda,J. Ilic,J. Imber,T. Ishida,C. Ishihara,T. Ishii,S. J. Ives,M. Iwasaki,K. Iyogi,A. Izmaylov,B. Jamieson,R. A. Johnson,K. K. Joo,G. Jover-Manas,C. K. Jung,H. Kaji,Takaaki Kajita,H. Kakuno,J. Kameda,K. Kaneyuki,D. Karlen,D. Karlen,Katsuyu Kasami,I. Kato,E. Kearns,M. M. Khabibullin,F. Khanam,A. N. Khotjantsev,D. Kielczewska,T. Kikawa,Jungsang Kim,J. Y. Kim,Soo-Bong Kim,N. Kimura,B. Kirby,J. Kisiel,P. Kitching,Takashi Kobayashi,G. Kogan,S. Koike,A. Konaka,L. L. Kormos,A. Korzenev,K. Koseki,Yusuke Koshio,Y. Kouzuma,K. Kowalik,V. Kravtsov,I. Kreslo,W. R. Kropp,H. Kubo,Yu. G. Kudenko,N. Kulkarni,R.P. Kurjata,T. Kutter,J. Lagoda,K. Laihem,Marco Laveder,K. P. Lee,P. T. Le,J. M. Levy,C. Licciardi,I. T. Lim,T. Lindner,R. P. Litchfield,R. P. Litchfield,Michael Litos,A. Longhin,G. D. Lopez,P. F. Loverre,L. Ludovici,Thorsten Lux,M. Macaire,Kendall Mahn,Yasuhiro Makida,M. Malek,S. Manly,A. Marchionni,A. D. Marino,J. Marteau,J. F. Martin,T. Maruyama,T. Maryon,J. Marzec,P. Masliah,E. L. Mathie,C. Matsumura,Kodai Matsuoka,Viktor Matveev,K. Mavrokoridis,E. Mazzucato,N. McCauley,Kevin Scott McFarland,C. McGrew,T. McLachlan,M. Messina,W. Metcalf,C. J. Metelko,M. Mezzetto,P. Mijakowski,C. A. Miller,A. Minamino,Oleg Mineev,S. Mine,A. Missert,G. Mituka,M. Miura,K. Mizouchi,L. Monfregola,F. Moreau,B. Morgan,S. Moriyama,A. Muir,A. Murakami,M. Murdoch,S. Murphy,J. Myslik,T. Nakadaira,Masayuki Nakahata,T. Nakai,K. Nakajima,Tatsushi Nakamoto,Koji Nakamura,S. Nakayama,Tsuyoshi Nakaya,D. Naples,M. L. Navin,Barry L. Nelson,T. C. Nicholls,K. Nishikawa,H. Nishino,J. A. Nowak,M. Noy,Y. Obayashi,Toru Ogitsu,Hirokatsu Ohhata,Takahiro Okamura,Kimihiro Okumura,T. Okusawa,S. M. Oser,Minoru Otani,R. A. Owen,Yuichi Oyama,T. Ozaki,M. Y. Pac,V. Palladino,V. Paolone,P. Paul,D. Payne,G. F. Pearce,J. D. Perkin,V. Pettinacci,F. Pierre,E. Poplawska,B. A. Popov,M. Posiadala,J. M. Poutissou,R. Poutissou,P. Przewlocki,W. Qian,J. L. Raaf,E. Radicioni,P. N. Ratoff,T. M. Raufer,M. Ravonel,Michel Raymond,F. Retiere,A. Robert,P. A. Rodrigues,E. Rondio,J. M. Roney,Biagio Rossi,S. Roth,André Rubbia,D. Ruterbories,S. Sabouri,R. Sacco,Ken Sakashita,Federico Sanchez,A. Sarrat,K. Sasaki,Kate Scholberg,J. Schwehr,Mark Scott,D. I. Scully,Y. Seiya,T. Sekiguchi,Hiroyuki Sekiya,M. Shibata,Y. Shimizu,Masato Shiozawa,S. Short,M. Siyad,Richard J.H. Smith,M. B. Smy,Jan T. Sobczyk,Henry W. Sobel,M. Sorel,Achim Stahl,P. Stamoulis,J. Steinmann,B. Still,J. L. Stone,C. Strabel,L. R. Sulak,R. Sulej,P. Sutcliffe,A. Suzuki,Kazuhiro Suzuki,S. Y. Suzuki,Sy Suzuki,Yoshihiro Suzuki,T. Szeglowski,M. Szeptycka,R. Tacik,R. Tacik,M. Tada,Susumu Takahashi,Atsushi Takeda,Y. Takenaga,Y. Takeuchi,Kenichi Tanaka,H.A. Tanaka,Masashi Tanaka,M. M. Tanaka,N. Tanimoto,K. Tashiro,I. Taylor,A. Terashima,D. Terhorst,R. Terri,Lester D.R. Thompson,A. Thorley,W. H. Toki,Takayuki Tomaru,Y. Totsuka,C. Touramanis,T. Tsukamoto,M. Tzanov,M. Tzanov,Y. Uchida,Koh Ueno,Antonin Vacheret,M. Vagins,G. Vasseur,T. Wachala,J. J. Walding,A. V. Waldron,C. W. Walter,P. Wanderer,Jing Wang,M. A. Ward,G. P. Ward,D. L. Wark,D. L. Wark,M. O. Wascko,A. C. Weber,A. C. Weber,R. A. Wendell,N. West,Leigh H. Whitehead,G. Wikström,R. J. Wilkes,M. J. Wilking,J. R. Wilson,Robert Wilson,T. Wongjirad,S. Yamada,Yoshikazu Yamada,A. Yamamoto,Kazuhiro Yamamoto,Yutaka Yamanoi,Hiroshi Yamaoka,C. Yanagisawa,T. Yano,S. Yen,N. Yershov,Masashi Yokoyama,A. Zalewska,J. Zalipska,L. Zambelli,K. Zaremba,M. Ziembicki,E. D. Zimmerman,M. Zito,J. Zmuda +416 more
TL;DR: The T2K experiment observes indications of ν (μ) → ν(e) appearance in data accumulated with 1.43×10(20) protons on target, and under this hypothesis, the probability to observe six or more candidate events is 7×10(-3), equivalent to 2.5σ significance.
Journal ArticleDOI
Indication of Reactor ν¯e Disappearance in the Double Chooz Experiment
Yoshio Abe,C. Aberle,T. Akiri,J. C. dos Anjos,F. Ardellier,A. F. Barbosa,A. Baxter,M. Bergevin,A. Bernstein,T.J.C. Bezerra,L. Bezrukhov,E. Blucher,M. Bongrand,Nathaniel Bowden,Christian Buck,J. Busenitz,Anatael Cabrera,E. Caden,L. Camilleri,R. Carr,M. Cerrada,P.-J. Chang,P. Chimenti,T. Classen,T. Classen,Antoine Collin,E. Conover,Janet Conrad,S. Cormon,J. I. Crespo-Anadón,M. Cribier,K. Crum,A. Cucoanes,M. V. d'Agostino,E. Damon,J.V. Dawson,Steven Dazeley,M. Dierckxsens,D. Dietrich,Z. Djurcic,M. Dracos,V. Durand,Yu. Efremenko,M. Elnimr,Y. Endo,A.V. Etenko,E. Falk,Muriel Fallot,M. Fechner,F. von Feilitzsch,J. Felde,S. M. Fernandes,D. Franco,A. J. Franke,M. Franke,H. Furuta,R. Gama,I. Gil-Botella,Lydie Giot,M. Göger-Neff,Luis González,M. C. Goodman,J. Tm. Goon,D. Greiner,B. Guillon,N. Haag,Caren Hagner,T. Hara,F. X. Hartmann,J. Hartnell,T. Haruna,J. Haser,A. Hatzikoutelis,T. Hayakawa,Michael Hofmann,G. A. Horton-Smith,Masaki Ishitsuka,J. Jochum,C. Jollet,C. L. Jones,Florian Kaether,L.N. Kalousis,Yuri Kamyshkov,Daniel M. Kaplan,T. Kawasaki,G. Keefer,E. Kemp,H. de Kerret,Y. Kibe,T. Konno,D. Kryn,M. Kuze,Tobias Lachenmaier,C. E. Lane,C. Langbrandtner,Thierry Lasserre,Alain Letourneau,David Lhuillier,H. P. Lima,Manfred Lindner,Yehan Liu,J. M. López-Castanõ,J. M. LoSecco,Bayarto Lubsandorzhiev,S. Lucht,D. Mckee,D. Mckee,J. Maeda,C. N. Maesano,C. Mariani,J. Maricic,J. Martino,T. Matsubara,G. Mention,A. Meregaglia,T. Miletic,R. Milincic,A. Milzstajn,H. Miyata,D. Motta,Th. A. Mueller,Yasushi Nagasaka,K. Nakajima,P. Novella,M. Obolensky,Lothar Oberauer,A. Onillon,A. Osborn,I. Ostrovskiy,C. Palomares,S. J. M. Peeters,I. M. Pepe,S. Perasso,P. Perrin,P. Pfahler,Amanda Porta,W. Potzel,R. Queval,J. Reichenbacher,B. Reinhold,A. Remoto,A. Remoto,D. E. Reyna,M. Röhling,S. Roth,H. A. Rubin,Y. Sakamoto,R. Santorelli,F. Sato,S. Schönert,Stefan Schoppmann,U. Schwan,Thomas Schwetz,M. H. Shaevitz,D. Shrestha,J. L. Sida,V. V. Sinev,M. D. Skorokhvatov,E. Smith,J. Spitz,A. Stahl,I. Stancu,Matthew L Strait,A. Stüken,F. Suekane,S. V. Sukhotin,T. Sumiyoshi,Ying Sun,Z. Sun,R. Svoboda,H. Tabata,N. Tamura,Kazuhiro Terao,A. Tonazzo,M. Toups,H. H. Trinh Thi,C. Veyssiere,Sebastian Wagner,H. Watanabe,B. White,Christopher Wiebusch,Lindley Winslow,M. Worcester,Michael Wurm,E. Yanovitch,F. Yermia,K. Zbiri,K. Zbiri,V. Zimmer +188 more
TL;DR: The Double Chooz experiment presents an indication of reactor electron antineutrino disappearance consistent with neutrino oscillations, and an observed-to-predicted ratio of events of 0.944±0.016 and a deficit can be interpreted as a nonzero value of the still unmeasured neutrinos mixing parameter sin(2)2θ(13).
Journal ArticleDOI
Measurement of neutrino oscillation with KamLAND: evidence of spectral distortion.
T. Araki,K. Eguchi,Sanshiro Enomoto,K. Furuno,Koichi Ichimura,H. Ikeda,Kunio Inoue,K. Ishihara,K. Ishihara,T. Iwamoto,T. Iwamoto,T. Kawashima,Yasuhiro Kishimoto,M. Koga,Y. Koseki,T. Maeda,T. Mitsui,M. Motoki,K. Nakajima,Hiroshi Ogawa,K. Owada,J. S. Ricol,I. Shimizu,J. Shirai,F. Suekane,A. Suzuki,K. Tada,Osamu Tajima,K. Tamae,Y. Tsuda,Hiroko Watanabe,J. Busenitz,T. Classen,Z. Djurcic,G. Keefer,K. McKinny,Dongming Mei,Dongming Mei,A. Piepke,E. Yakushev,B. E. Berger,B. E. Berger,Y. D. Chan,Y. D. Chan,M. P. Decowski,M. P. Decowski,D. A. Dwyer,D. A. Dwyer,Stuart J. Freedman,Stuart J. Freedman,Y. Fu,Y. Fu,B. K. Fujikawa,B. K. Fujikawa,J. Goldman,J. Goldman,Frederick Gray,Frederick Gray,K. M. Heeger,K. M. Heeger,K. T. Lesko,K. T. Lesko,Kam Biu Luk,Kam Biu Luk,Hitoshi Murayama,Hitoshi Murayama,A. W. P. Poon,A. W. P. Poon,H. M. Steiner,H. M. Steiner,Lindley Winslow,Lindley Winslow,G. A. Horton-Smith,G. A. Horton-Smith,C. Mauger,R. D. McKeown,Petr Vogel,C. E. Lane,T. Miletic,Peter Gorham,G. Guillian,John G. Learned,J. Maricic,S. Matsuno,Sandip Pakvasa,S. Dazeley,S. Hatakeyama,A. Rojas,Robert Svoboda,B. D. Dieterle,J. A. Detwiler,Giorgio Gratta,K. Ishii,N. Tolich,Y. Uchida,Y. Uchida,M. Batygov,W. M. Bugg,Yuri Efremenko,Y. Kamyshkov,A. Kozlov,Y. Nakamura,C. R. Gould,C. R. Gould,Hugon J Karwowski,Hugon J Karwowski,D. M. Markoff,D. M. Markoff,J. A. Messimore,J. A. Messimore,Koji Nakamura,Koji Nakamura,Ryan Rohm,Ryan Rohm,Werner Tornow,Werner Tornow,R. Wendell,R. Wendell,Albert Young,Albert Young,M. J. Chen,Y. F. Wang,F. Piquemal +122 more
TL;DR: In this article, a study of neutrino oscillation based on a 766 ton/year exposure of KamLAND to reactor antineutrinos is presented, where the observed energy spectrum disagrees with the expected spectral shape.
Journal ArticleDOI
Experimental investigation of geologically produced antineutrinos with KamLAND
T. Araki,Sanshiro Enomoto,K. Furuno,Y. Gando,Koichi Ichimura,H. Ikeda,Kunio Inoue,Yasuhiro Kishimoto,M. Koga,Y. Koseki,T. Maeda,T. Mitsui,M. Motoki,K. Nakajima,Hiroshi Ogawa,M. Ogawa,K. Owada,J. S. Ricol,I. Shimizu,J. Shirai,F. Suekane,A. Suzuki,K. Tada,Sakae Takeuchi,K. Tamae,Y. Tsuda,Hideki Watanabe,J. Busenitz,T. Classen,Z. Djurcic,G. Keefer,David Leonard,A. Piepke,E. Yakushev,B. E. Berger,Y. D. Chan,M. P. Decowski,D. A. Dwyer,Stuart J. Freedman,B. K. Fujikawa,J. Goldman,Frederick Gray,K. M. Heeger,L. Hsu,K. T. Lesko,K. B. Luk,Hitoshi Murayama,T. O'Donnell,A. W. P. Poon,H. M. Steiner,Lindley Winslow,C. Mauger,R. D. McKeown,Petr Vogel,C. E. Lane,T. Miletic,G. Guillian,John G. Learned,J. Maricic,S. Matsuno,Sandip Pakvasa,G. A. Horton-Smith,S. Dazeley,S. Hatakeyama,A. Rojas,R. Svoboda,B. D. Dieterle,J. A. Detwiler,Giorgio Gratta,K. Ishii,N. Tolich,Y. Uchida,M. Batygov,W. M. Bugg,Yuri Efremenko,Yuri Kamyshkov,A. Kozlov,Y. Nakamura,Hugon J Karwowski,Hugon J Karwowski,Hugon J Karwowski,D. M. Markoff,D. M. Markoff,D. M. Markoff,Koji Nakamura,Koji Nakamura,Koji Nakamura,Ryan Rohm,Ryan Rohm,Ryan Rohm,Werner Tornow,Werner Tornow,Werner Tornow,R. A. Wendell,R. A. Wendell,R. A. Wendell,M. J. Chen,Y. F. Wang,F. Piquemal +98 more
TL;DR: Although the present data have limited statistical power, they nevertheless provide by direct means an upper limit for the radiogenic power of U and Th in the Earth, a quantity that is currently poorly constrained.