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Deutsche Physikalische Gessellschaft IOP Institute of Physics

Reactor neutrino oscillation studies with KamLAND

Focus on Neutrino Physics

K Inoue

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Part of Focus on Neutrino Physics

KamLAND, the 1000 t liquid scintillator detector utilizing nuclear power reactors distributing effectively ~180 km from the experimental site, has performed a search for reactor neutrino oscillations. Results obtained from the baseline show evidence for reactor neutrino disappearance, while previous searches at less than 1 km showed consistent flux, as expected. This provides a resolution for the long-standing solar neutrino problem if combined with results from solar neutrino experiments. KamLAND with increased statistics also provided evidence of spectral distortion as expected from the neutrino oscillation and, if converted to the L/E distribution, it shows clear oscillatory behaviour of neutrino propagation. Consequently, the results have a good sensitivity on neutrino oscillation parameters and a precise determination of Δm2 has been realized.


PACS

29.40.Mc Scintillation detectors

96.60.Vg Particle emission, solar wind

14.60.Lm Ordinary neutrinos (nue, numu, nutau)

Subjects

Accelerators, beams and electromagnetism

Nuclear physics

Instrumentation and measurement

Particle physics and field theory

Astrophysics and astroparticles

Dates

Issue 1 (October 2004)

Received 6 July 2004

Published 28 October 2004



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