We report an improved geoneutrino measurement with Borexino from 2056 days of data taking. The present exposure is 5.5 AE 0.3 10 31 proton yr. Assuming a chondritic Th/U mass ratio of 3.9, we obtain 23.7 6.5 -5.7 stat 0.9 -0.6 sys geoneutrino events. The null observation of geoneutrinos with Borexino alone has a probability of 3.6 10 -9 (5.9). A geoneutrino signal from the mantle is obtained at 98% C.L.
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Agostini et al. (2015) studied this question.
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