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First results from KamLAND: evidence for reactor antineutrino disappearance |
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| 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 B E Chan Y D Decowski M P Dwyer D A Freedman S J Fu Y Fujikawa B K Heeger K M Lesko K T Luk K-B Murayama H Nygren D R Okada C E Poon A W P Steiner H M Winslow L A Horton-Smith G A McKeown R D Ritter J |
| Institution: | Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan. |
| Abstract: | 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. |
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