We report an improved geoneutrino measurement with Borexino from 2056 days of data taking. The present exposure is (5.5±0.3)×10+31 proton×yr. Assuming a chondritic Th/U mass ratio of 3.9, we obtain 23.7(-5.7+6.5 stat)(−0.6+0.9 sys) geoneutrino events. The null observation of geoneutrinos with Borexino alone has a probability of 3.6×10-9 (5.9σ). A geoneutrino signal from the mantle is obtained at 98% C.L. The radiogenic heat production for U and Th from the present best-fit result is restricted to the range 23–36 TW, taking into account the uncertainty on the distribution of heat producing elements inside the Earth.
Spectroscopy of geoneutrinos from 2056 days of Borexino data
ORTICA, Fausto;ROMANI, Aldo;
2015
Abstract
We report an improved geoneutrino measurement with Borexino from 2056 days of data taking. The present exposure is (5.5±0.3)×10+31 proton×yr. Assuming a chondritic Th/U mass ratio of 3.9, we obtain 23.7(-5.7+6.5 stat)(−0.6+0.9 sys) geoneutrino events. The null observation of geoneutrinos with Borexino alone has a probability of 3.6×10-9 (5.9σ). A geoneutrino signal from the mantle is obtained at 98% C.L. The radiogenic heat production for U and Th from the present best-fit result is restricted to the range 23–36 TW, taking into account the uncertainty on the distribution of heat producing elements inside the Earth.File in questo prodotto:
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