TY  - JOUR
AU  - Fogli, G. L.
AU  - Lisi, E.
AU  - Palazzo, A.
AU  - Rotunno, A. M.
PY  - 2010
DA  - 2010//
TI  - Combined analysis of KamLAND and Borexino neutrino signals from Th and U decays in the Earth's interior
T2  - Phys. Rev. D
JO  - Physical Review D
SP  - 093006
EP  - 9pp
VL  - 82
IS  - 9
PB  - Amer Physical Soc
AB  - 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.
SN  - 1550-7998
UR  - http://arxiv.org/abs/1006.1113
UR  - https://doi.org/10.1103/PhysRevD.82.093006
DO  - 10.1103/PhysRevD.82.093006
LA  - English
N1  - ISI:000284144900001
ID  - Fogli_etal2010
ER  -