Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2005-05-10
Phys.Lett.B623:80-92,2005
Physics
High Energy Physics
High Energy Physics - Phenomenology
22 pages, including 9 figures
Scientific paper
10.1016/j.physletb.2005.07.064
The Kamioka Liquid scintillator Anti-Neutrino Detector (KamLAND) is sensitive to the neutrino event spectrum from (mainly Japanese) nuclear reactors in both the energy domain and the time domain. While the energy spectrum of KamLAND events allows the determination of the neutrino oscillation parameters, the time spectrum can be used to monitor known and unknown neutrino sources. By using available monthly-binned data on event-by-event energies in KamLAND and on reactor powers in Japan, we perform a likelihood analysis of the neutrino event spectra in energy and time, and find significant indications in favor of time variations of the known reactor sources, as compared with the hypothetical case of constant reactor neutrino flux. We also find that the KamLAND data place interesting upper limits on the power of a speculative nuclear reactor operating in the Earth's core (the so-called georeactor); such limits are strengthened by including solar neutrino constraints on the neutrino mass and mixing parameters. Our results corroborate the standard interpretation of the KamLAND signal as due to oscillating neutrinos from known reactor sources.
Fogli Gian Luigi
Lisi Eligio
Palazzo Antonio
Rotunno Anna Maria
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