Reactor on-off antineutrino measurement with KamLAND

A. Gando; Y. Gando; H. Hanakago; H. Ikeda; K. Inoue; K. Ishidoshiro; H. Ishikawa; M. Koga; R. Matsuda; S. Matsuda; T. Mitsui; D. Motoki; K. Nakamura; A. Obata; A. Oki; Y. Oki; M. Otani; I. Shimizu; J. Shirai; A. Suzuki; Y. Takemoto; K. Tamae; K. Ueshima; H. Watanabe; B. D. Xu; S. Yamada; Y. Yamauchi; H. Yoshida; A. Kozlov; S. Yoshida; A. Piepke; T. I. Banks; B. K. Fujikawa; K. Han; T. O'Donnell; B. E. Berger; J. G. Learned; S. Matsuno; M. Sakai; Y. Efremenko; H. J. Karwowski; D. M. Markoff; W. Tornow; J. A. Detwiler; S. Enomoto; M. P. Decowski

doi:10.1103/PhysRevD.88.033001

Reactor on-off antineutrino measurement with KamLAND

A. Gando, Y. Gando, H. Hanakago, H. Ikeda, K. Inoue, K. Ishidoshiro, H. Ishikawa, M. Koga, R. Matsuda, S. Matsuda, T. Mitsui, D. Motoki, K. Nakamura, A. Obata, A. Oki, Y. Oki, M. Otani, I. Shimizu, J. Shirai, A. SuzukiY. Takemoto, K. Tamae, K. Ueshima, H. Watanabe, B. D. Xu, S. Yamada, Y. Yamauchi, H. Yoshida, A. Kozlov, S. Yoshida, A. Piepke, T. I. Banks, B. K. Fujikawa, K. Han, T. O'Donnell, B. E. Berger, J. G. Learned, S. Matsuno, M. Sakai, Y. Efremenko, H. J. Karwowski, D. M. Markoff, W. Tornow, J. A. Detwiler, S. Enomoto, M. P. Decowski

ニュートリノ科学研究センター

研究成果: Article › 査読

236 被引用数 (Scopus)

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The recent long-term shutdown of Japanese nuclear reactors has resulted in a significantly reduced reactor ν_̄e flux at KamLAND. This running condition provides a unique opportunity to confirm and constrain backgrounds for the reactor ν_̄e oscillation analysis. The data set also has improved sensitivity for other ν_̄e signals, in particular ν_̄e's produced in β-decays from U238 and Th232 within the Earth's interior, whose energy spectrum overlaps with that of reactor ν_̄e's. Including constraints on θ₁₃ from accelerator and short-baseline reactor neutrino experiments, a combined three-flavor analysis of solar and KamLAND data gives fit values for the oscillation parameters of ^tan2θ₁₂=0.436-0.025+0.029, Δm212=7.53-0.18+0.18×10^-5 eV2, and ^sin2θ₁₃=0.023-0.002+0.002. Assuming a chondritic Th/U mass ratio, we obtain 116-27+28 ν_̄e events from U238 and Th232, corresponding to a geo ν_̄e flux of 3.4-0.8+0.8×106 cm^-2 s^-1 at the KamLAND location. We evaluate various bulk silicate Earth composition models using the observed geo ν_̄e rate.

本文言語	English
論文番号	033001
ジャーナル	Physical Review D - Particles, Fields, Gravitation and Cosmology
巻	88
号	3
DOI	https://doi.org/10.1103/PhysRevD.88.033001
出版ステータス	Published - 2013 8月 2

ASJC Scopus subject areas

核物理学および高エネルギー物理学
物理学および天文学（その他）

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10.1103/PhysRevD.88.033001

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Gando, A., Gando, Y., Hanakago, H., Ikeda, H., Inoue, K., Ishidoshiro, K., Ishikawa, H., Koga, M., Matsuda, R., Matsuda, S., Mitsui, T., Motoki, D., Nakamura, K., Obata, A., Oki, A., Oki, Y., Otani, M., Shimizu, I., Shirai, J., ... Decowski, M. P. (2013). Reactor on-off antineutrino measurement with KamLAND. Physical Review D - Particles, Fields, Gravitation and Cosmology, 88(3), [033001]. https://doi.org/10.1103/PhysRevD.88.033001

Gando, A, Gando, Y, Hanakago, H, Ikeda, H , Inoue, K , Ishidoshiro, K, Ishikawa, H, Koga, M, Matsuda, R, Matsuda, S, Mitsui, T, Motoki, D, Nakamura, K, Obata, A, Oki, A, Oki, Y, Otani, M, Shimizu, I, Shirai, J, Suzuki, A, Takemoto, Y, Tamae, K, Ueshima, K, Watanabe, H, Xu, BD, Yamada, S, Yamauchi, Y, Yoshida, H, Kozlov, A, Yoshida, S, Piepke, A, Banks, TI, Fujikawa, BK, Han, K, O'Donnell, T, Berger, BE, Learned, JG, Matsuno, S, Sakai, M, Efremenko, Y, Karwowski, HJ, Markoff, DM, Tornow, W, Detwiler, JA, Enomoto, S & Decowski, MP 2013, 'Reactor on-off antineutrino measurement with KamLAND', Physical Review D - Particles, Fields, Gravitation and Cosmology, vol. 88, no. 3, 033001. https://doi.org/10.1103/PhysRevD.88.033001

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title = "Reactor on-off antineutrino measurement with KamLAND",

abstract = "The recent long-term shutdown of Japanese nuclear reactors has resulted in a significantly reduced reactor {\=ν}e flux at KamLAND. This running condition provides a unique opportunity to confirm and constrain backgrounds for the reactor {\=ν}e oscillation analysis. The data set also has improved sensitivity for other {\=ν}e signals, in particular {\=ν}e's produced in β-decays from U238 and Th232 within the Earth's interior, whose energy spectrum overlaps with that of reactor {\=ν}e's. Including constraints on θ13 from accelerator and short-baseline reactor neutrino experiments, a combined three-flavor analysis of solar and KamLAND data gives fit values for the oscillation parameters of tan2θ12=0.436-0.025+0.029, Δm212=7.53-0.18+0.18×10-5 eV2, and sin2θ13=0.023-0.002+0.002. Assuming a chondritic Th/U mass ratio, we obtain 116-27+28 {\=ν}e events from U238 and Th232, corresponding to a geo {\=ν}e flux of 3.4-0.8+0.8×106 cm-2 s-1 at the KamLAND location. We evaluate various bulk silicate Earth composition models using the observed geo {\=ν}e rate.",

author = "A. Gando and Y. Gando and H. Hanakago and H. Ikeda and K. Inoue and K. Ishidoshiro and H. Ishikawa and M. Koga and R. Matsuda and S. Matsuda and T. Mitsui and D. Motoki and K. Nakamura and A. Obata and A. Oki and Y. Oki and M. Otani and I. Shimizu and J. Shirai and A. Suzuki and Y. Takemoto and K. Tamae and K. Ueshima and H. Watanabe and Xu, {B. D.} and S. Yamada and Y. Yamauchi and H. Yoshida and A. Kozlov and S. Yoshida and A. Piepke and Banks, {T. I.} and Fujikawa, {B. K.} and K. Han and T. O'Donnell and Berger, {B. E.} and Learned, {J. G.} and S. Matsuno and M. Sakai and Y. Efremenko and Karwowski, {H. J.} and Markoff, {D. M.} and W. Tornow and Detwiler, {J. A.} and S. Enomoto and Decowski, {M. P.}",

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AU - Gando, A.

AU - Gando, Y.

AU - Hanakago, H.

AU - Ikeda, H.

AU - Inoue, K.

AU - Ishidoshiro, K.

AU - Ishikawa, H.

AU - Koga, M.

AU - Matsuda, R.

AU - Matsuda, S.

AU - Mitsui, T.

AU - Motoki, D.

AU - Nakamura, K.

AU - Obata, A.

AU - Oki, A.

AU - Oki, Y.

AU - Otani, M.

AU - Shimizu, I.

AU - Shirai, J.

AU - Suzuki, A.

AU - Takemoto, Y.

AU - Tamae, K.

AU - Ueshima, K.

AU - Watanabe, H.

AU - Xu, B. D.

AU - Yamada, S.

AU - Yamauchi, Y.

AU - Yoshida, H.

AU - Kozlov, A.

AU - Yoshida, S.

AU - Piepke, A.

AU - Banks, T. I.

AU - Fujikawa, B. K.

AU - Han, K.

AU - O'Donnell, T.

AU - Berger, B. E.

AU - Learned, J. G.

AU - Matsuno, S.

AU - Sakai, M.

AU - Efremenko, Y.

AU - Karwowski, H. J.

AU - Markoff, D. M.

AU - Tornow, W.

AU - Detwiler, J. A.

AU - Enomoto, S.

AU - Decowski, M. P.

PY - 2013/8/2

Y1 - 2013/8/2

N2 - The recent long-term shutdown of Japanese nuclear reactors has resulted in a significantly reduced reactor ν̄e flux at KamLAND. This running condition provides a unique opportunity to confirm and constrain backgrounds for the reactor ν̄e oscillation analysis. The data set also has improved sensitivity for other ν̄e signals, in particular ν̄e's produced in β-decays from U238 and Th232 within the Earth's interior, whose energy spectrum overlaps with that of reactor ν̄e's. Including constraints on θ13 from accelerator and short-baseline reactor neutrino experiments, a combined three-flavor analysis of solar and KamLAND data gives fit values for the oscillation parameters of tan2θ12=0.436-0.025+0.029, Δm212=7.53-0.18+0.18×10-5 eV2, and sin2θ13=0.023-0.002+0.002. Assuming a chondritic Th/U mass ratio, we obtain 116-27+28 ν̄e events from U238 and Th232, corresponding to a geo ν̄e flux of 3.4-0.8+0.8×106 cm-2 s-1 at the KamLAND location. We evaluate various bulk silicate Earth composition models using the observed geo ν̄e rate.

AB - The recent long-term shutdown of Japanese nuclear reactors has resulted in a significantly reduced reactor ν̄e flux at KamLAND. This running condition provides a unique opportunity to confirm and constrain backgrounds for the reactor ν̄e oscillation analysis. The data set also has improved sensitivity for other ν̄e signals, in particular ν̄e's produced in β-decays from U238 and Th232 within the Earth's interior, whose energy spectrum overlaps with that of reactor ν̄e's. Including constraints on θ13 from accelerator and short-baseline reactor neutrino experiments, a combined three-flavor analysis of solar and KamLAND data gives fit values for the oscillation parameters of tan2θ12=0.436-0.025+0.029, Δm212=7.53-0.18+0.18×10-5 eV2, and sin2θ13=0.023-0.002+0.002. Assuming a chondritic Th/U mass ratio, we obtain 116-27+28 ν̄e events from U238 and Th232, corresponding to a geo ν̄e flux of 3.4-0.8+0.8×106 cm-2 s-1 at the KamLAND location. We evaluate various bulk silicate Earth composition models using the observed geo ν̄e rate.

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JO - Physical Review D - Particles, Fields, Gravitation and Cosmology

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Reactor on-off antineutrino measurement with KamLAND

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