Fabio Mantovani

Measurement of geo-neutrinos from 1353 days of Borexino

Abstract We present a measurement of the geo-neutrino signal obtained from 1353 days of data with the Borexino detector at Laboratori Nazionali del Gran Sasso in Italy. With a fiducial exposure of ( 3.69 ± 0.16 ) × 10 31 proton × year after all selection cuts and background subtraction, we detected ( 14.3 ± 4.4 ) geo-neutrino events assuming a fixed chondritic mass Th/U ratio of 3.9. This corresponds to a geo-neutrino signal S geo = ( 38.8 ± 12.0 ) TNU with just a 6 × 10 − 6 probability for a null geo-neutrino measurement. With U and Th left as free parameters in the fit, the relative signals are S Th = ( 10.6 ± 12.7 ) TNU and S U = ( 26.5 ± 19.5 ) TNU . Borexino data alone are compatible with a mantle geo-neutrino signal of ( 15.4 ± 12.3 ) TNU , while a combined analysis with the KamLAND data allows to extract a mantle signal of ( 14.1 ± 8.1 ) TNU . Our measurement of 31.2 − 6.1 + 7.0 reactor anti-neutrino events is in agreement with expectations in the presence of neutrino oscillations.

Antineutrinos from Earth: A reference model and its uncertainties

We predict geoneutrino fluxes in a reference model based on a detailed description of Earths crust and mantle and using the best available information on the abundances of uranium, thorium, and potassium inside Earths layers. We estimate the uncertainties of fluxes corresponding to the uncertainties of the element abundances. In addition to distance integrated fluxes, we also provide the differential fluxes as a function of distance from several sites of experimental interest. Event yields at several locations are estimated and their dependence on the neutrino oscillation parameters is discussed. At Kamioka we predict

Geo-neutrinos and earth's interior

N(\mathrm{U}+\mathrm{Th})=35\ifmmode\pm\else\textpm\fi{}6

A new FSA approach for in situ γ ray spectroscopy.

events for

Neutrinos and Energetics of the Earth

{10}^{32}\mathrm{proton}\mathrm{yr}

Mantle geoneutrinos in KamLAND and Borexino

and 100% efficiency assuming

How much uranium is in the Earth? Predictions for geoneutrinos at KamLAND

{\mathrm{sin}}^{2}(2\ensuremath{\theta})=0.863

Calibration of HPGe detectors using certified reference materials of natural origin

and

Geo-Neutrinos: a short review

\ensuremath{\delta}{m}^{2}=7.3\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}5}{\mathrm{eV}}^{2}.

A multivariate spatial interpolation of airborne γ-ray data using the geological constraints

The maximal prediction is 55 events, obtained in a model with fully radiogenic production of the terrestrial heat flow.