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Published January 17, 2003 | Published
Journal Article Open

First Results from KamLAND: Evidence for Reactor Antineutrino Disappearance


KamLAND has measured the flux of ν̅ _e's from distant nuclear reactors. We find fewer ν̅ _e events than expected from standard assumptions about ν̅ _e propagation at the 99.95% C.L. In a 162   ton·yr exposure the ratio of the observed inverse β-decay events to the expected number without ν̅ _e disappearance is 0.611±0.085(stat)±0.041(syst) for ν̅ _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.

Additional Information

© 2003 The American Physical Society. Received 6 December 2002; published 17 January 2003. The KamLAND experiment is supported by the Center of Excellence program of the Japanese Ministry of Education, Culture, Sports, Science and Technology, and funding from the United States Department of Energy. The reactor data are provided courtesy of the following electric associations in Japan; Hokkaido, Tohoku, Tokyo, Hokuriku, Chubu, Kansai, Chugoku, Shikoku and Kyushu Electric Power Companies, Japan Atomic Power Co., and Japan Nuclear Cycle Development Institute. Kamioka Mining and Smelting Company provided services for activities in the mine.

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