First Results from KamLAND: Evidence for Reactor Antineutrino Disappearance

K. Eguchi, S. Enomoto, K. Furuno, J. Goldman, H. Hanada, H. Ikeda, K. Ikeda, K. Inoue, K. Ishihara, W. Itoh, T. Iwamoto, T. Kawaguchi, T. Kawashima, H. Kinoshita, Y. Kishimoto, M. Koga, Y. Koseki, T. Maeda, T. Mitsui, M. MotokiK. Nakajima, M. Nakajima, T. Nakajima, H. Ogawa, K. Owada, T. Sakabe, I. Shimizu, J. Shirai, F. Suekane, A. Suzuki, K. Tada, O. Tajima, T. Takayama, K. Tamae, H. Watanabe, J. Busenitz, Z. Djurcic, K. McKinny, D. M. Mei, A. Piepke, E. Yakushev, B. E. Berger, Y. D. Chan, M. P. Decowski, D. A. Dwyer, S. J. Freedman, Y. Fu, B. K. Fujikawa, K. M. Heeger, K. T. Lesko, K. B. Luk, H. Murayama, D. R. Nygren, C. E. Okada, A. W.P. Poon, H. M. Steiner, L. A. Winslow, G. A. Horton-Smith, R. D. McKeown, J. Ritter, B. Tipton, P. Vogel, C. E. Lane, T. Miletic, P. W. Gorham, G. Guillian, J. G. Learned, J. Maricic, S. Matsuno, S. Pakvasa, S. Dazeley, S. Hatakeyama, M. Murakami, R. C. Svoboda, B. D. Dieterle, M. DiMauro, J. Detwiler, G. Gratta, K. Ishii, N. Tolich, Y. Uchida, M. Batygov, W. Bugg, H. Cohn, Y. Efremenko, Y. Kamyshkov, A. Kozlov, Y. Nakamura, L. de Braeckeleer, C. R. Gould, H. J. Karwowski, D. M. Markoff, J. A. Messimore, K. Nakamura, R. M. Rohm, W. Tornow, A. R. Young, Y. F. Wang

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41 Citations (Scopus)

Abstract

KamLAND has measured the flux of [Formula presented]’s from distant nuclear reactors. We find fewer [Formula presented] events than expected from standard assumptions about [Formula presented] propagation at the 99.95% C.L. In a [Formula presented] exposure the ratio of the observed inverse [Formula presented]-decay events to the expected number without [Formula presented] disappearance is [Formula presented] for [Formula presented] energies [Formula presented]. In the context of two-flavor neutrino oscillations with CPT invariance, all solutions to the solar neutrino problem except for the “large mixing angle” region are excluded.

Original languageEnglish
Pages (from-to)6
Number of pages1
JournalPhysical review letters
Volume90
Issue number2
DOIs
Publication statusPublished - 2003

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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