Combined analysis of KamLAND and Borexino neutrino signals from Th and U decays in the Earth's interior

Details Combined analysis of KamLAND and Borexino neutrino signals from Th and U decays in the Earth's interior Combined analysis of KamLAND and Borexino neutrino signals from Th and U decays in the Earth's interior

2010-06-06

arxiv.org/abs/1006.1113v1

Phys.Rev.D82:093006,2010

Physics

High Energy Physics

High Energy Physics - Phenomenology

12 pages, including 6 figures

Scientific paper

10.1103/PhysRevD.82.093006

The KamLAND and Borexino experiments have detected electron antineutrinos produced in the decay chains of natural thorium and uranium (Th and U geoneutrinos). We analyze the energy spectra of current geoneutrino data in combination with solar and long-baseline reactor neutrino data, with marginalized three-neutrino oscillation parameters. We consider the case with unconstrained Th and U event rates in KamLAND and Borexino, as well as cases with fewer degrees of freedom, as obtained by successively assuming for both experiments a common Th/U ratio, a common scaling of Th+U event rates, and a chondritic Th/U value. In combination, KamLAND and Borexino can reject the null hypothesis (no geoneutrino signal) at 5 sigma. Interesting bounds or indications emerge on the Th+U geoneutrino rates and on the Th/U ratio, in broad agreement with typical Earth model expectations. Conversely, the results disfavor the hypothesis of a georeactor in the Earth's core, if its power exceeds a few TW. The interplay of KamLAND and Borexino geoneutrino data is highlighted.

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