Speaker
Description
The new Borexino geo-neutrino analysis includes the well-optimized cuts and increased dataset. Consequently, the exposure is doubled providing $(1.29\pm0.05)\times10^{32}$ protons$\cdot$year. The geo-neutrino signal equals $47.0_{-7.7}^{+8.4}$ (stat) $_{-1.9}^{+2.4}$ (sys) TNU corresponding to $_{-17.2}^{+18.3}\%$ total precision. The mantle signal of $21.2_{-9.0}^{+9.6}$ (stat) $_{-0.9}^{+1.1}$ (sys) TNU is derived using the geological knowledge of the local and far field lithosphere. The null-hypothesis is excluded at $99.0\%$ C.L. The total radiogenic heat of $38.2_{-12.7}^{+13.6}$ TW is obtained. The predictions of the lowest concentration of heat-producing elements in the mantle are slightly disfavored ($\sim2.4\sigma$). The constraint on the hypothetical georeactor power is $2.4$ TW at $95\%$ C.L. if located at the Earth’s center.
Mini-abstract
Borexino sees geo-neutrinos with ~18% error and excludes the mantle signal absence at 99.0% C.L.
| Experiment/Collaboration | on behalf of the Borexino Collaboration |
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