First results from KamLAND: evidence for reactor antineutrino disappearance.


Journal Article

KamLAND has measured the flux of nu;(e)'s from distant nuclear reactors. We find fewer nu;(e) events than expected from standard assumptions about nu;(e) propagation at the 99.95% C.L. In a 162 ton.yr exposure the ratio of the observed inverse beta-decay events to the expected number without nu;(e) disappearance is 0.611+/-0.085(stat)+/-0.041(syst) for nu;(e) energies >3.4 MeV. 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.

Full Text

Duke Authors

Cited Authors

  • Eguchi, K; Enomoto, S; Furuno, K; Goldman, J; Hanada, H; Ikeda, H; Ikeda, K; Inoue, K; Ishihara, K; Itoh, W; Iwamoto, T; Kawaguchi, T; Kawashima, T; Kinoshita, H; Kishimoto, Y; Koga, M; Koseki, Y; Maeda, T; Mitsui, T; Motoki, M; Nakajima, K; Nakajima, M; Nakajima, T; Ogawa, H; Owada, K; Sakabe, T; Shimizu, I; Shirai, J; Suekane, F; Suzuki, A; Tada, K; Tajima, O; Takayama, T; Tamae, K; Watanabe, H; Busenitz, J; Djurcic, Z; McKinny, K; Mei, D-M; Piepke, A; Yakushev, E; Berger, BE; Chan, YD; Decowski, MP; Dwyer, DA; Freedman, SJ; Fu, Y; Fujikawa, BK; Heeger, KM; Lesko, KT; Luk, K-B; Murayama, H; Nygren, DR; Okada, CE; Poon, AWP; Steiner, HM; Winslow, LA; Horton-Smith, GA; McKeown, RD; Ritter, J; Tipton, B; Vogel, P; Lane, CE; Miletic, T; Gorham, PW; Guillian, G; Learned, JG; Maricic, J; Matsuno, S; Pakvasa, S; Dazeley, S; Hatakeyama, S; Murakami, M; Svoboda, RC; Dieterle, BD; DiMauro, M; Detwiler, J; Gratta, G; Ishii, K; Tolich, N; Uchida, Y; Batygov, M; Bugg, W; Cohn, H; Efremenko, Y; Kamyshkov, Y; Kozlov, A; Nakamura, Y; De Braeckeleer, L; Gould, CR; Karwowski, HJ; Markoff, DM; Messimore, JA; Nakamura, K; Rohm, RM; Tornow, W; Young, AR; Wang, Y-F; KamLAND Collaboration,

Published Date

  • January 17, 2003

Published In

Volume / Issue

  • 90 / 2

Start / End Page

  • 021802 -

PubMed ID

  • 12570536

Pubmed Central ID

  • 12570536

Electronic International Standard Serial Number (EISSN)

  • 1079-7114

International Standard Serial Number (ISSN)

  • 0031-9007

Digital Object Identifier (DOI)

  • 10.1103/physrevlett.90.021802


  • eng