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

Research output: Contribution to journalArticle

132 Citations (Scopus)

Abstract

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 tan12=0.436-0.025+0.029, Δm212=7.53-0.18+0.18×10-5 eV2, and sin13=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.

Original languageEnglish (US)
Article number033001
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume88
Issue number3
DOIs
StatePublished - Aug 2 2013
Externally publishedYes

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antineutrinos
reactors
oscillations
shutdowns
nuclear reactors
mass ratios
silicates
energy spectra
accelerators
neutrinos
sensitivity
decay

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)

Cite this

Gando, A., Gando, Y., Hanakago, H., Ikeda, H., Inoue, K., Ishidoshiro, K., ... 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

Reactor on-off antineutrino measurement with KamLAND. / 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, B. D.; Yamada, S.; Yamauchi, Y.; Yoshida, H.; Kozlov, A.; Yoshida, S.; Piepke, A.; Banks, T. I.; Fujikawa, B. K.; Han, K.; O'Donnell, T.; Berger, B. E.; Learned, J. G.; Matsuno, S.; Sakai, M.; Efremenko, Y.; Karwowski, H. J.; Markoff, D. M.; Tornow, W.; Detwiler, J. A.; Enomoto, S.; Decowski, M. P.

In: Physical Review D - Particles, Fields, Gravitation and Cosmology, Vol. 88, No. 3, 033001, 02.08.2013.

Research output: Contribution to journalArticle

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
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, B. D. ; Yamada, S. ; Yamauchi, Y. ; Yoshida, H. ; Kozlov, A. ; Yoshida, S. ; Piepke, A. ; Banks, T. I. ; Fujikawa, B. K. ; Han, K. ; O'Donnell, T. ; Berger, B. E. ; Learned, J. G. ; Matsuno, S. ; Sakai, M. ; Efremenko, Y. ; Karwowski, H. J. ; Markoff, D. M. ; Tornow, W. ; Detwiler, J. A. ; Enomoto, S. ; Decowski, M. P. / Reactor on-off antineutrino measurement with KamLAND. In: Physical Review D - Particles, Fields, Gravitation and Cosmology. 2013 ; Vol. 88, No. 3.
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abstract = "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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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.

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AU - Obata, A.

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AU - Otani, M.

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AU - Shirai, J.

AU - Suzuki, A.

AU - Takemoto, Y.

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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.

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