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20 April 2024

» pubmed » pmid12570536

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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 Motoki ; K 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 ; ;
Date:	17 Jan 2003
Journal:	Phys Rev Lett, 90 (2), 021802
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.
Source:	PubMed, pmid12570536
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