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Measurement of geo-neutrinos from 1353 days of Borexino

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.
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http://hal.in2p3.fr/in2p3-00873963
Contributor : Daniel Vignaud <>
Submitted on : Wednesday, October 16, 2013 - 5:55:00 PM
Last modification on : Monday, December 14, 2020 - 9:53:46 AM

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

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