Measurement of neutrino oscillation with KamLAND: Evidence of spectral distortion

T. Araki; K. Eguchi; S. Enomoto; K. Furuno; K. Ichimura; H. Ikeda; K. Inoue; K. Ishihara; T. Iwamoto; T. Kawashima; Y. Kishimoto; M. Koga; Y. Koseki; T. Maeda; T. Mitsui; M. Motoki; K. Nakajima; H. Ogawa; K. Owada; J. S. Ricol; I. Shimizu; J. Shirai; F. Suekane; A. Suzuki; K. Tada; O. Tajima; K. Tamae; Y. Tsuda; H. Watanabe; J. Busenitz; T. Classen; Z. Djurcic; G. Keefer; 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; J. Goldman; F. Gray; K. M. Heeger; K. T. Lesko; K. B. Luk; H. Murayama; A. W.P. Poon; H. M. Steiner; L. A. Winslow; G. A. Horton-Smith; C. Mauger; R. D. McKeown; 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; A. Rojas; R. Svoboda; B. D. Dieterle; J. Detwiler; G. Gratta; K. Ishii; N. Tolich; Y. Uchida; M. Batygov; W. Bugg; Y. Efremenko; Y. Kamyshkov; A. Kozlov; Y. Nakamura; C. R. Gould; H. J. Karwowski; D. M. Markoff; J. A. Messimore; K. Nakamura; R. M. Rohm; W. Tornow; R. Wendell; A. R. Young; M. J. Chen; Y. F. Wang; F. Piquemal

doi:10.1103/PhysRevLett.94.081801

Measurement of neutrino oscillation with KamLAND: Evidence of spectral distortion

T. Araki, K. Eguchi, S. Enomoto, K. Furuno, K. Ichimura, H. Ikeda, K. Inoue, K. Ishihara, T. Iwamoto, T. Kawashima, Y. Kishimoto, M. Koga, Y. Koseki, T. Maeda, T. Mitsui, M. Motoki, K. Nakajima, H. Ogawa, K. Owada, J. S. RicolI. Shimizu, J. Shirai, F. Suekane, A. Suzuki, K. Tada, O. Tajima, K. Tamae, Y. Tsuda, H. Watanabe, J. Busenitz, T. Classen, Z. Djurcic, G. Keefer, 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, J. Goldman, F. Gray, K. M. Heeger, K. T. Lesko, K. B. Luk, H. Murayama, A. W.P. Poon, H. M. Steiner, L. A. Winslow, G. A. Horton-Smith, C. Mauger, R. D. McKeown, 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, A. Rojas, R. Svoboda, B. D. Dieterle, J. Detwiler, G. Gratta, K. Ishii, N. Tolich, Y. Uchida, M. Batygov, W. Bugg, Y. Efremenko, Y. Kamyshkov, A. Kozlov, Y. Nakamura, C. R. Gould, H. J. Karwowski, D. M. Markoff, J. A. Messimore, K. Nakamura, R. M. Rohm, W. Tornow, R. Wendell, A. R. Young, M. J. Chen, Y. F. Wang, F. Piquemal

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Abstract

We present results of a study of neutrino oscillation based on a 766 ton/year exposure of KamLAND to reactor antineutrinos. We observe 258 ν̄_e candidate events with energies above 3.4 MeV compared to 365.2 ± 23.7 events expected in the absence of neutrino oscillation. Accounting for 17.8 ± 7.3 expected background events, the statistical significance for reactor ν̄_e disappearance is 99.998%. The observed energy spectrum disagrees with the expected spectral shape in the absence of neutrino oscillation at 99.6% significance and prefers the distortion expected from ν̄_e oscillation effects. A two-neutrino oscillation analysis of the KamLAND data gives Δm² = 7.9 _+0.5^+0.6 × 10^-5 eV². A global analysis of data from KamLAND and solar-neutrino experiments yields Δm² = 7.9_0.5^0.6 × 10^-5 eV² and tan²θ = 0.40_0.07^+0.10 the most precise determination to date.

Original language	English
Article number	081801
Journal	Physical review letters
Volume	94
Issue number	8
DOIs	https://doi.org/10.1103/PhysRevLett.94.081801
Publication status	Published - 2005 Mar 4

ASJC Scopus subject areas

Physics and Astronomy(all)

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Araki, T., Eguchi, K., Enomoto, S., Furuno, K., Ichimura, K., Ikeda, H., Inoue, K., Ishihara, K., Iwamoto, T., Kawashima, T., Kishimoto, Y., Koga, M., Koseki, Y., Maeda, T., Mitsui, T., Motoki, M., Nakajima, K., Ogawa, H., Owada, K., ... Piquemal, F. (2005). Measurement of neutrino oscillation with KamLAND: Evidence of spectral distortion. Physical review letters, 94(8), [081801]. https://doi.org/10.1103/PhysRevLett.94.081801

Measurement of neutrino oscillation with KamLAND : Evidence of spectral distortion. / Araki, T.; Eguchi, K.; Enomoto, S.; Furuno, K.; Ichimura, K.; Ikeda, H.; Inoue, K.; Ishihara, K.; Iwamoto, T.; Kawashima, T.; Kishimoto, Y.; Koga, M.; Koseki, Y.; Maeda, T.; Mitsui, T.; Motoki, M.; Nakajima, K.; Ogawa, H.; Owada, K.; Ricol, J. S.; Shimizu, I.; Shirai, J.; Suekane, F.; Suzuki, A.; Tada, K.; Tajima, O.; Tamae, K.; Tsuda, Y.; Watanabe, H.; Busenitz, J.; Classen, T.; Djurcic, Z.; Keefer, G.; 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.; Goldman, J.; Gray, F.; Heeger, K. M.; Lesko, K. T.; Luk, K. B.; Murayama, H.; Poon, A. W.P.; Steiner, H. M.; Winslow, L. A.; Horton-Smith, G. A.; Mauger, C.; McKeown, R. D.; Vogel, P.; Lane, C. E.; Miletic, T.; Gorham, P. W.; Guillian, G.; Learned, J. G.; Maricic, J.; Matsuno, S.; Pakvasa, S.; Dazeley, S.; Hatakeyama, S.; Rojas, A.; Svoboda, R.; Dieterle, B. D.; Detwiler, J.; Gratta, G.; Ishii, K.; Tolich, N.; Uchida, Y.; Batygov, M.; Bugg, W.; Efremenko, Y.; Kamyshkov, Y.; Kozlov, A.; Nakamura, Y.; Gould, C. R.; Karwowski, H. J.; Markoff, D. M.; Messimore, J. A.; Nakamura, K.; Rohm, R. M.; Tornow, W.; Wendell, R.; Young, A. R.; Chen, M. J.; Wang, Y. F.; Piquemal, F.

In: Physical review letters, Vol. 94, No. 8, 081801, 04.03.2005.

Research output: Contribution to journal › Article › peer-review

Araki, T, Eguchi, K, Enomoto, S, Furuno, K, Ichimura, K , Ikeda, H , Inoue, K, Ishihara, K, Iwamoto, T, Kawashima, T, Kishimoto, Y , Koga, M, Koseki, Y, Maeda, T, Mitsui, T , Motoki, M, Nakajima, K, Ogawa, H, Owada, K, Ricol, JS, Shimizu, I, Shirai, J, Suekane, F, Suzuki, A, Tada, K, Tajima, O, Tamae, K, Tsuda, Y, Watanabe, H, Busenitz, J, Classen, T, Djurcic, Z, Keefer, G, McKinny, K, Mei, DM, Piepke, A, Yakushev, E, Berger, BE, Chan, YD, Decowski, MP, Dwyer, DA, Freedman, SJ, Fu, Y, Fujikawa, BK, Goldman, J, Gray, F, Heeger, KM, Lesko, KT, Luk, KB, Murayama, H, Poon, AWP, Steiner, HM, Winslow, LA, Horton-Smith, GA, Mauger, C, McKeown, RD, Vogel, P, Lane, CE, Miletic, T, Gorham, PW, Guillian, G, Learned, JG, Maricic, J, Matsuno, S, Pakvasa, S, 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, Gould, CR, Karwowski, HJ, Markoff, DM, Messimore, JA, Nakamura, K, Rohm, RM, Tornow, W, Wendell, R, Young, AR, Chen, MJ, Wang, YF & Piquemal, F 2005, 'Measurement of neutrino oscillation with KamLAND: Evidence of spectral distortion', Physical review letters, vol. 94, no. 8, 081801. https://doi.org/10.1103/PhysRevLett.94.081801

Araki, T. ; Eguchi, K. ; Enomoto, S. ; Furuno, K. ; Ichimura, K. ; Ikeda, H. ; Inoue, K. ; Ishihara, K. ; Iwamoto, T. ; Kawashima, T. ; Kishimoto, Y. ; Koga, M. ; Koseki, Y. ; Maeda, T. ; Mitsui, T. ; Motoki, M. ; Nakajima, K. ; Ogawa, H. ; Owada, K. ; Ricol, J. S. ; Shimizu, I. ; Shirai, J. ; Suekane, F. ; Suzuki, A. ; Tada, K. ; Tajima, O. ; Tamae, K. ; Tsuda, Y. ; Watanabe, H. ; Busenitz, J. ; Classen, T. ; Djurcic, Z. ; Keefer, G. ; 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. ; Goldman, J. ; Gray, F. ; Heeger, K. M. ; Lesko, K. T. ; Luk, K. B. ; Murayama, H. ; Poon, A. W.P. ; Steiner, H. M. ; Winslow, L. A. ; Horton-Smith, G. A. ; Mauger, C. ; McKeown, R. D. ; Vogel, P. ; Lane, C. E. ; Miletic, T. ; Gorham, P. W. ; Guillian, G. ; Learned, J. G. ; Maricic, J. ; Matsuno, S. ; Pakvasa, S. ; Dazeley, S. ; Hatakeyama, S. ; Rojas, A. ; Svoboda, R. ; Dieterle, B. D. ; Detwiler, J. ; Gratta, G. ; Ishii, K. ; Tolich, N. ; Uchida, Y. ; Batygov, M. ; Bugg, W. ; Efremenko, Y. ; Kamyshkov, Y. ; Kozlov, A. ; Nakamura, Y. ; Gould, C. R. ; Karwowski, H. J. ; Markoff, D. M. ; Messimore, J. A. ; Nakamura, K. ; Rohm, R. M. ; Tornow, W. ; Wendell, R. ; Young, A. R. ; Chen, M. J. ; Wang, Y. F. ; Piquemal, F. / Measurement of neutrino oscillation with KamLAND : Evidence of spectral distortion. In: Physical review letters. 2005 ; Vol. 94, No. 8.

@article{5653438d8e034c8e9730f8a1cf4c6547,

title = "Measurement of neutrino oscillation with KamLAND: Evidence of spectral distortion",

abstract = "We present results of a study of neutrino oscillation based on a 766 ton/year exposure of KamLAND to reactor antineutrinos. We observe 258 {\=ν}e candidate events with energies above 3.4 MeV compared to 365.2 ± 23.7 events expected in the absence of neutrino oscillation. Accounting for 17.8 ± 7.3 expected background events, the statistical significance for reactor {\=ν}e disappearance is 99.998%. The observed energy spectrum disagrees with the expected spectral shape in the absence of neutrino oscillation at 99.6% significance and prefers the distortion expected from {\=ν}e oscillation effects. A two-neutrino oscillation analysis of the KamLAND data gives Δm2 = 7.9 +0.5+0.6 × 10-5 eV2. A global analysis of data from KamLAND and solar-neutrino experiments yields Δm2 = 7.90.50.6 × 10-5 eV2 and tan2θ = 0.400.07+0.10 the most precise determination to date.",

author = "T. Araki and K. Eguchi and S. Enomoto and K. Furuno and K. Ichimura and H. Ikeda and K. Inoue and K. Ishihara and T. Iwamoto and T. Kawashima and Y. Kishimoto and M. Koga and Y. Koseki and T. Maeda and T. Mitsui and M. Motoki and K. Nakajima and H. Ogawa and K. Owada and Ricol, {J. S.} and I. Shimizu and J. Shirai and F. Suekane and A. Suzuki and K. Tada and O. Tajima and K. Tamae and Y. Tsuda and H. Watanabe and J. Busenitz and T. Classen and Z. Djurcic and G. Keefer and K. McKinny and Mei, {D. M.} and A. Piepke and E. Yakushev and Berger, {B. E.} and Chan, {Y. D.} and Decowski, {M. P.} and Dwyer, {D. A.} and Freedman, {S. J.} and Y. Fu and Fujikawa, {B. K.} and J. Goldman and F. Gray and Heeger, {K. M.} and Lesko, {K. T.} and Luk, {K. B.} and H. Murayama and Poon, {A. W.P.} and Steiner, {H. M.} and Winslow, {L. A.} and Horton-Smith, {G. A.} and C. Mauger and McKeown, {R. D.} and P. Vogel and Lane, {C. E.} and T. Miletic and Gorham, {P. W.} and G. Guillian and Learned, {J. G.} and J. Maricic and S. Matsuno and S. Pakvasa and S. Dazeley and S. Hatakeyama and A. Rojas and R. Svoboda and Dieterle, {B. D.} and J. Detwiler and G. Gratta and K. Ishii and N. Tolich and Y. Uchida and M. Batygov and W. Bugg and Y. Efremenko and Y. Kamyshkov and A. Kozlov and Y. Nakamura and Gould, {C. R.} and Karwowski, {H. J.} and Markoff, {D. M.} and Messimore, {J. A.} and K. Nakamura and Rohm, {R. M.} and W. Tornow and R. Wendell and Young, {A. R.} and Chen, {M. J.} and Wang, {Y. F.} and F. Piquemal",

year = "2005",

month = mar,

day = "4",

doi = "10.1103/PhysRevLett.94.081801",

language = "English",

volume = "94",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "8",

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TY - JOUR

T1 - Measurement of neutrino oscillation with KamLAND

T2 - Evidence of spectral distortion

AU - Araki, T.

AU - Eguchi, K.

AU - Enomoto, S.

AU - Furuno, K.

AU - Ichimura, K.

AU - Ikeda, H.

AU - Inoue, K.

AU - Ishihara, K.

AU - Iwamoto, T.

AU - Kawashima, T.

AU - Kishimoto, Y.

AU - Koga, M.

AU - Koseki, Y.

AU - Maeda, T.

AU - Mitsui, T.

AU - Motoki, M.

AU - Nakajima, K.

AU - Ogawa, H.

AU - Owada, K.

AU - Ricol, J. S.

AU - Shimizu, I.

AU - Shirai, J.

AU - Suekane, F.

AU - Suzuki, A.

AU - Tada, K.

AU - Tajima, O.

AU - Tamae, K.

AU - Tsuda, Y.

AU - Watanabe, H.

AU - Busenitz, J.

AU - Classen, T.

AU - Djurcic, Z.

AU - Keefer, G.

AU - McKinny, K.

AU - Mei, D. M.

AU - Piepke, A.

AU - Yakushev, E.

AU - Berger, B. E.

AU - Chan, Y. D.

AU - Decowski, M. P.

AU - Dwyer, D. A.

AU - Freedman, S. J.

AU - Fu, Y.

AU - Fujikawa, B. K.

AU - Goldman, J.

AU - Gray, F.

AU - Heeger, K. M.

AU - Lesko, K. T.

AU - Luk, K. B.

AU - Murayama, H.

AU - Poon, A. W.P.

AU - Steiner, H. M.

AU - Winslow, L. A.

AU - Horton-Smith, G. A.

AU - Mauger, C.

AU - McKeown, R. D.

AU - Vogel, P.

AU - Lane, C. E.

AU - Miletic, T.

AU - Gorham, P. W.

AU - Guillian, G.

AU - Learned, J. G.

AU - Maricic, J.

AU - Matsuno, S.

AU - Pakvasa, S.

AU - Dazeley, S.

AU - Hatakeyama, S.

AU - Rojas, A.

AU - Svoboda, R.

AU - Dieterle, B. D.

AU - Detwiler, J.

AU - Gratta, G.

AU - Ishii, K.

AU - Tolich, N.

AU - Uchida, Y.

AU - Batygov, M.

AU - Bugg, W.

AU - Efremenko, Y.

AU - Kamyshkov, Y.

AU - Kozlov, A.

AU - Nakamura, Y.

AU - Gould, C. R.

AU - Karwowski, H. J.

AU - Markoff, D. M.

AU - Messimore, J. A.

AU - Nakamura, K.

AU - Rohm, R. M.

AU - Tornow, W.

AU - Wendell, R.

AU - Young, A. R.

AU - Chen, M. J.

AU - Wang, Y. F.

AU - Piquemal, F.

PY - 2005/3/4

Y1 - 2005/3/4

N2 - We present results of a study of neutrino oscillation based on a 766 ton/year exposure of KamLAND to reactor antineutrinos. We observe 258 ν̄e candidate events with energies above 3.4 MeV compared to 365.2 ± 23.7 events expected in the absence of neutrino oscillation. Accounting for 17.8 ± 7.3 expected background events, the statistical significance for reactor ν̄e disappearance is 99.998%. The observed energy spectrum disagrees with the expected spectral shape in the absence of neutrino oscillation at 99.6% significance and prefers the distortion expected from ν̄e oscillation effects. A two-neutrino oscillation analysis of the KamLAND data gives Δm2 = 7.9 +0.5+0.6 × 10-5 eV2. A global analysis of data from KamLAND and solar-neutrino experiments yields Δm2 = 7.90.50.6 × 10-5 eV2 and tan2θ = 0.400.07+0.10 the most precise determination to date.

AB - We present results of a study of neutrino oscillation based on a 766 ton/year exposure of KamLAND to reactor antineutrinos. We observe 258 ν̄e candidate events with energies above 3.4 MeV compared to 365.2 ± 23.7 events expected in the absence of neutrino oscillation. Accounting for 17.8 ± 7.3 expected background events, the statistical significance for reactor ν̄e disappearance is 99.998%. The observed energy spectrum disagrees with the expected spectral shape in the absence of neutrino oscillation at 99.6% significance and prefers the distortion expected from ν̄e oscillation effects. A two-neutrino oscillation analysis of the KamLAND data gives Δm2 = 7.9 +0.5+0.6 × 10-5 eV2. A global analysis of data from KamLAND and solar-neutrino experiments yields Δm2 = 7.90.50.6 × 10-5 eV2 and tan2θ = 0.400.07+0.10 the most precise determination to date.

UR - http://www.scopus.com/inward/record.url?scp=18144427171&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=18144427171&partnerID=8YFLogxK

U2 - 10.1103/PhysRevLett.94.081801

DO - 10.1103/PhysRevLett.94.081801

M3 - Article

AN - SCOPUS:18144427171

VL - 94

JO - Physical Review Letters

JF - Physical Review Letters

SN - 0031-9007

IS - 8

M1 - 081801

ER -

Measurement of neutrino oscillation with KamLAND: Evidence of spectral distortion

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