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We report an improved geo-neutrino measurement with Borexino from 2056 daysof data taking. The present exposure is $(5.5\pm0.3)\times10^{31}$proton$\times$yr. Assuming a chondritic Th/U mass ratio of 3.9, we obtain $23.7^{+6.5}_{-5.7} (stat) ^{+0.9}_{-0.6} (sys)$ geo-neutrino events. The nullobservation of geo-neutrinos with Borexino alone has a probability of $3.6\times 10^{-9}$ (5.9$\sigma$). A geo-neutrino signal from the mantle isobtained at 98\% C.L. The radiogenic heat production for U and Th from thepresent best-fit result is restricted to the range 23-36 TW, taking intoaccount the uncertainty on the distribution of heat producing elements insidethe Earth.

Spectroscopy of geo-neutrinos from 2056 days of Borexino data