Spectroscopy of geo-neutrinos from 2056 days of Borexino data

PHYSICAL REVIEW D(2015)

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摘要
We report an improved geoneutrino measurement with Borexino from 2056 days of data taking. The present exposure is (5.5 +/- 0.3) x 10(31) proton x 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 x 10(-9) (5.9 sigma). 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.
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关键词
geoneutrinos,spectroscopy
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