Spectroscopy of geoneutrinos from 2056 days of Borexino data

M. Agostini, S. Appel, G. Bellini, Jay Burton Benziger, D. Bick, G. Bonfini, D. Bravo, B. Caccianiga, Frank Calaprice, A. Caminata, P. Cavalcante, A. Chepurnov, K. Choi, D. D'Angelo, S. Davini, A. Derbin, L. Di Noto, I. Drachnev, A. Empl, A. EtenkoG. Fiorentini, K. Fomenko, D. Franco, F. Gabriele, Cristiano Galbiati, C. Ghiano, M. Giammarchi, M. Goeger-Neff, A. Goretti, M. Gromov, C. Hagner, T. Houdy, 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, B. Neumair, L. Oberauer, M. Obolensky, F. Ortica, K. Otis, L. Pagani, M. Pallavicini, L. Papp, L. Perasso, A. Pocar, G. Ranucci, A. Razeto, A. Re, B. Ricci, A. Romani, R. Roncin, N. Rossi, S. Schönert, D. Semenov, H. Simgen, M. Skorokhvatov, 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. Wojcik, M. Wurm, Z. Yokley, O. Zaimidoroga, S. Zavatarelli, K. Zuber, G. Zuzel

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Abstract

We report an improved geoneutrino measurement with Borexino from 2056 days of data taking. The present exposure is (5.5±0.3)×1031 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.

Original languageEnglish (US)
Article number031101
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume92
Issue number3
DOIs
StatePublished - Aug 7 2015

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)

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    Agostini, M., Appel, S., Bellini, G., Benziger, J. B., Bick, D., Bonfini, G., Bravo, D., Caccianiga, B., Calaprice, F., Caminata, A., Cavalcante, P., Chepurnov, A., Choi, K., D'Angelo, D., Davini, S., Derbin, A., Di Noto, L., Drachnev, I., Empl, A., ... Zuzel, G. (2015). Spectroscopy of geoneutrinos from 2056 days of Borexino data. Physical Review D - Particles, Fields, Gravitation and Cosmology, 92(3), [031101]. https://doi.org/10.1103/PhysRevD.92.031101