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arxiv 1506.04610 v2 pith:O6IAN6KJ submitted 2015-06-15 hep-ex physics.ins-det

Spectroscopy of geo-neutrinos from 2056 days of Borexino data

Borexino collaboration , M. Agostini , S. Appel , G. Bellini , J. Benziger , D. Bick , G. Bonfini , D. Bravo
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B. Caccianiga F. Calaprice A. Caminata P. Cavalcante A. Chepurnov K. Choi D. DAngelo S. Davini A. Derbin L. Di Noto I. Drachnev A. Empl A. Etenko G. Fiorentini K. Fomenko D. Franco F. Gabriele C. Galbiati C. Ghiano M. Giammarchi M. Goger-Neff A. Goretti M. Gromov C. Hagner E. Hungerford Aldo Ianni Andrea Ianni K. Jedrzejczak M. Kaiser V. Kobychev D. Korablev G. Korga D. Kryn M. Laubenstein B. Lehnert E. Litvinovich F. Lombardi P. Lombardi L. Ludhova G. Lukyanchenko I. Machulin S. Manecki W. Maneschg F. Mantovani S. Marcocci E. Meroni M. Meyer L. Miramonti M. Misiaszek M. Montuschi P. Mosteiro V. Muratova L. Oberauer M. Obolensky F. Ortica K. Otis L. Pagani M. Pallavicini L. Papp L. Perasso S. Perasso A. Pocar G. Ranucci A. Razeto A. Re B. Ricci A. Romani R. Roncin N. Rossi S. Schoenert D. Semenov H. Simgen M. Skorokhavatov O. Smirnov A. Sotnikov S. Sukhotin Y. Suvorov R. Tartaglia G. Testera J. Thurn M. Toropova E. Unzhakov R.B. Vogelaar F. von Feilitzsch H. Wang S. Weinz J. Winter M. Woicik M. Wurm Z. Yokley O. Zaimidoroga S. Zavatarelli K. Zuber G. Zuzel
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classification hep-ex physics.ins-det
keywords borexinogeo-neutrinodatadaysgeo-neutrinosheattakingtimes
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We report an improved geo-neutrino measurement with Borexino from 2056 days of 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 null observation 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 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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