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Journal Articles Physics Letters B Year : 2013

Measurement of geo-neutrinos from 1353 days of Borexino

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G. Bellini
  • Function : Author
J. Benziger
  • Function : Author
D. Bick
  • Function : Author
G. Bonfini
  • Function : Author
D. Bravo
  • Function : Author
L. Cadonati
  • Function : Author
F. Calaprice
  • Function : Author
P. Cavalcante
  • Function : Author
A. Chavarria
  • Function : Author
A. Chepurnov
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D. d'Angelo
  • Function : Author
S. Davini
  • Function : Author
A. Derbin
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A. Empl
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A. Etenko
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G. Fiorentini
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K. Fomenko
  • Function : Author
D. Franco
S. Gazzana
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M. Goeger-Neff
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A. Goretti
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L. Grandi
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C. Hagner
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E. Hungerford
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Aldo Ianni
  • Function : Author
Andrea Ianni
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V. V. Kobychev
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D. Korablev
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G. Korga
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Y. Koshio
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T. Lewke
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E. Litvinovich
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B. Loer
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P. Lombardi
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F. Lombardi
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L. Ludhova
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G. Lukyanchenko
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I. Machulin
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S. Manecki
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W. Maneschg
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F. Mantovani
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G. Manuzio
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Q. Meindl
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E. Meroni
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L. Miramonti
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M. Misiaszek
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P. Mosteiro
  • Function : Author
V. Muratova
  • Function : Author
L. Oberauer
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K. Otis
  • Function : Author
M. Pallavicini
L. Papp
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L. Perasso
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A. Pocar
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G. Ranucci
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A. Razeto
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A. Re
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B. Ricci
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A. Romani
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N. Rossi
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A. Sabelnikov
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R. Saldanha
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C. Salvo
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S. Schönert
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H. Simgen
M. Skorokhvatov
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O. Smirnov
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A. Sotnikov
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S. Sukhotin
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Y. Suvorov
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R. Tartaglia
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G. Testera
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F. von Feilitzsch
  • Function : Author
J. Winter
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M. Wojcik
  • Function : Author
A. Wright
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M. Wurm
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J. Xu
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O. Zaimidoroga
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S. Zavatarelli
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G. Zuzel
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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±0.16)×1031 proton × year after all selection cuts and background subtraction, we detected (14.3±4.4) geo-neutrino events assuming a fixed chondritic mass Th/U ratio of 3.9. This corresponds to a geo-neutrino signal Sgeo=(38.8±12.0) TNU with just a 6×10-6 probability for a null geo-neutrino measurement. With U and Th left as free parameters in the fit, the relative signals are STh=(10.6±12.7) TNU and SU=(26.5±19.5) TNU. Borexino data alone are compatible with a mantle geo-neutrino signal of (15.4±12.3) TNU, while a combined analysis with the KamLAND data allows to extract a mantle signal of (14.1±8.1) TNU. Our measurement of 31.2-6.1+7.0 reactor anti-neutrino events is in agreement with expectations in the presence of neutrino oscillations.

Dates and versions

in2p3-00873963 , version 1 (16-10-2013)

Identifiers

Cite

G. Bellini, J. Benziger, D. Bick, G. Bonfini, D. Bravo, et al.. Measurement of geo-neutrinos from 1353 days of Borexino. Physics Letters B, 2013, 722, pp.295-300. ⟨10.1016/J.PHYSLETB.2013.04.030⟩. ⟨in2p3-00873963⟩
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