Experimental investigation of geologically produced antineutrinos with KamLAND.


Journal Article

The detection of electron antineutrinos produced by natural radioactivity in the Earth could yield important geophysical information. The Kamioka liquid scintillator antineutrino detector (KamLAND) has the sensitivity to detect electron antineutrinos produced by the decay of 238U and 232Th within the Earth. Earth composition models suggest that the radiogenic power from these isotope decays is 16 TW, approximately half of the total measured heat dissipation rate from the Earth. Here we present results from a search for geoneutrinos with KamLAND. Assuming a Th/U mass concentration ratio of 3.9, the 90 per cent confidence interval for the total number of geoneutrinos detected is 4.5 to 54.2. This result is consistent with the central value of 19 predicted by geophysical models. Although our present data have limited statistical power, they nevertheless provide by direct means an upper limit (60 TW) for the radiogenic power of U and Th in the Earth, a quantity that is currently poorly constrained.

Full Text

Duke Authors

Cited Authors

  • Araki, T; Enomoto, S; Furuno, K; Gando, Y; Ichimura, K; Ikeda, H; Inoue, K; Kishimoto, Y; Koga, M; Koseki, Y; Maeda, T; Mitsui, T; Motoki, M; Nakajima, K; Ogawa, H; Ogawa, M; Owada, K; Ricol, JS; Shimizu, I; Shirai, J; Suekane, F; Suzuki, A; Tada, K; Takeuchi, S; Tamae, K; Tsuda, Y; Watanabe, H; Busenitz, J; Classen, T; Djurcic, Z; Keefer, G; Leonard, D; Piepke, A; Yakushev, E; Berger, BE; Chan, YD; Decowski, MP; Dwyer, DA; Freedman, SJ; Fujikawa, BK; Goldman, J; Gray, F; Heeger, KM; Hsu, L; Lesko, KT; Luk, KB; Murayama, H; O'Donnell, T; Poon, AW; Steiner, HM; Winslow, LA; Mauger, C; McKeown, RD; Vogel, P; Lane, CE; Miletic, T; Guillian, G; Learned, JG; Maricic, J; Matsuno, S; Pakvasa, S; Horton-Smith, GA; Dazeley, S; Hatakeyama, S; Rojas, A; Svoboda, R; Dieterle, BD; Detwiler, J; Gratta, G; Ishii, K; Tolich, N; Uchida, Y; Batygov, M; Bugg, W; Efremenko, Y; Kamyshkov, Y; Kozlov, A; Nakamura, Y; Karwowski, HJ; Markoff, DM; Nakamura, K; Rohm, RM; Tornow, W; Wendell, R; Chen, MJ; Wang, YF; Piquemal, F

Published Date

  • July 2005

Published In

Volume / Issue

  • 436 / 7050

Start / End Page

  • 499 - 503

PubMed ID

  • 16049478

Pubmed Central ID

  • 16049478

Electronic International Standard Serial Number (EISSN)

  • 1476-4687

International Standard Serial Number (ISSN)

  • 0028-0836

Digital Object Identifier (DOI)

  • 10.1038/nature03980


  • eng