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Spectroscopy of geoneutrinos from 2056 days of Borexino data

M. Agostini et al. (Borexino Collaboration)
Phys. Rev. D 92, 031101(R) – Published 7 August 2015
Physics logo See Focus story: Neutrinos Detected from the Earth’s Mantle

Abstract

We report an improved geoneutrino measurement with Borexino from 2056 days of data taking. The present exposure is (5.5±0.3)×1031proton×yr. Assuming a chondritic Th/U mass ratio of 3.9, we obtain 23.75.7+6.5(stat)0.6+0.9(sys) geoneutrino events. The null observation of geoneutrinos with Borexino alone has a probability of 3.6×109 (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.

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  • Received 25 June 2015

DOI:https://doi.org/10.1103/PhysRevD.92.031101

© 2015 American Physical Society

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Neutrinos Detected from the Earth’s Mantle

Published 7 August 2015

About half of the neutrinos detected from natural, underground sources come from the Earth’s mantle, rather than the crust, according to an analysis of new neutrino detection data.

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Vol. 92, Iss. 3 — 1 August 2015

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