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27 April 2024

» arxiv » 1303.2571

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Measurement of geo-neutrinos from 1353 days of Borexino
G. Bellini ; J. Benziger ; D. Bick ; G. Bonfini ; D. Bravo ; M. Buizza Avanzini ; B. Caccianiga ; L. Cadonati ; F. Calaprice ; P. Cavalcante ; A. Chavarria ; A. Chepurnov ; D. D'Angelo ; S. Davini ; A. Derbin ; A. Empl ; A. Etenko ; G. Fiorentini ; K. Fomenko ; D. Franco ; C. Galbiati ; S. Gazzana ; C. Ghiano ; M. Giammarchi ; M. Goeger-Neff ; A. Goretti ; L. Grandi ; C. Hagner ; E. Hungerford ; Aldo Ianni ; Andrea Ianni ; V.V. Kobychev ; D. Korablev ; G. Korga ; Y. Koshio ; D. Kryn ; M. Laubenstein ; T. Lewke ; E. Litvinovich ; B. Loer ; P. Lombardi ; F. Lombardi ; L. Ludhova ; G. Lukyanchenko ; I. Machulin ; S. Manecki ; W. Maneschg ; F. Mantovani ; G. Manuzio ; Q. Meindl ; E. Meroni ; L. Miramonti ; M. Misiaszek ; P. Mosteiro ; V. Muratova ; L. Oberauer ; M. Obolensky ; F. Ortica ; K. Otis ; M. Pallavicini ; L. Papp ; L. Perasso ; S. Perasso ; A. Pocar ; G. Ranucci ; A. Razeto ; A. Re ; B. Ricci ; A. Romani ; N. Rossi ; A. Sabelnikov ; R. Saldanha ; C. Salvo ; S. Schoenert ; H. Simgen ; M. Skorokhvatov ; O. Smirnov ; A. Sotnikov ; S. Sukhotin ; Y. Suvorov ; R. Tartaglia ; G. Testera ; D. Vignaud ; R.B. Vogelaar ; F. von Feilitzsch ; J. Winter ; M. Wojcik ; A. Wright ; M. Wurm ; J. Xu ; O. Zaimidoroga ; S. Zavatarelli ; G. Zuzel ;
Date:	11 Mar 2013
Abstract:	We present a measurement of the geo--neutrino signal obtained from 1353 days of data with the Borexino detector at Laboratori Nazionali del Gran Sasso in Italy. With a fiducial exposure of (3.69 $pm$ 0.16) $ imes$ $10^{31}$ proton $ imes$ year after all selection cuts and background subtraction, we detected (14.3 $pm$ 4.4) geo-neutrino events assuming a fixed chondritic mass Th/U ratio of 3.9. This corresponds to a geo-neutrino signal $S_{geo}$ = (38.8 $pm$ 12.0) TNU with just a 6 $ imes$ $10^{-6}$ probability for a null geo-neutrino measurement. With U and Th left as free parameters in the fit, the relative signals are $S_{mathrm{Th}}$ = (10.6 $pm$ 12.7) TNU and $S_mathrm{U}$ = (26.5 $pm$ 19.5) TNU. Borexino data alone are compatible with a mantle geo--neutrino signal of (15.4 $pm$ 12.3) TNU, while a combined analysis with the KamLAND data allows to extract a mantle signal of (14.1 $pm$ 8.1) TNU. Our measurement of a reactor anti--neutrino signal $S_{react}$ = 84.5$^{+19.3}_{-18.9}$ TNU is in agreement with expectations in the presence of neutrino oscillations.
Source:	arXiv, 1303.2571
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