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Reactor on-off antineutrino measurement with KamLAND

Publication ,  Journal Article
Gando, A; Gando, Y; Hanakago, H; Ikeda, H; Inoue, K; Ishidoshiro, K; Ishikawa, H; Koga, M; Matsuda, R; Matsuda, S; Mitsui, T; Motoki, D ...
Published in: Physical Review D - Particles, Fields, Gravitation and Cosmology
August 2, 2013

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. © 2013 American Physical Society.

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Published In

Physical Review D - Particles, Fields, Gravitation and Cosmology

DOI

EISSN

1550-2368

ISSN

1550-7998

Publication Date

August 2, 2013

Volume

88

Issue

3

Related Subject Headings

  • Nuclear & Particles Physics
  • 5107 Particle and high energy physics
  • 5101 Astronomical sciences
  • 4902 Mathematical physics
  • 0206 Quantum Physics
  • 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics
  • 0201 Astronomical and Space Sciences
 

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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). https://doi.org/10.1103/PhysRevD.88.033001
Gando, A., Y. Gando, H. Hanakago, H. Ikeda, K. Inoue, K. Ishidoshiro, H. Ishikawa, et al. “Reactor on-off antineutrino measurement with KamLAND.” Physical Review D - Particles, Fields, Gravitation and Cosmology 88, no. 3 (August 2, 2013). https://doi.org/10.1103/PhysRevD.88.033001.
Gando A, Gando Y, Hanakago H, Ikeda H, Inoue K, Ishidoshiro K, et al. Reactor on-off antineutrino measurement with KamLAND. Physical Review D - Particles, Fields, Gravitation and Cosmology. 2013 Aug 2;88(3).
Gando, A., et al. “Reactor on-off antineutrino measurement with KamLAND.” Physical Review D - Particles, Fields, Gravitation and Cosmology, vol. 88, no. 3, Aug. 2013. Scopus, doi: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. Reactor on-off antineutrino measurement with KamLAND. Physical Review D - Particles, Fields, Gravitation and Cosmology. 2013 Aug 2;88(3).

Published In

Physical Review D - Particles, Fields, Gravitation and Cosmology

DOI

EISSN

1550-2368

ISSN

1550-7998

Publication Date

August 2, 2013

Volume

88

Issue

3

Related Subject Headings

  • Nuclear & Particles Physics
  • 5107 Particle and high energy physics
  • 5101 Astronomical sciences
  • 4902 Mathematical physics
  • 0206 Quantum Physics
  • 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics
  • 0201 Astronomical and Space Sciences