Measurement of geo-neutrinos from 1353 days of Borexino

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• 作者：Borexino Collaboration ?
  eShow"" style=""G. Bellini^a ; J. Benziger^b ; D. Bick^c ; G. Bonfini^d ; D. Bravo^e ; M. Buizza Avanzini^f ; B. Caccianiga^a ; L. Cadonati^g ; F. Calaprice^h ; P. Cavalcante^d ; A. Chavarria^h ; A. Chepurnovⁱ ; D. D?Angelo^a ; S. Davini^j ; A. Derbin^k ; A. Empl^j ; A. Etenko^l ; G. Fiorentini^m ; K. Fomenkoⁿ ; D. Franco^f ; C. Galbiati^h ; S. Gazzana^d ; C. Ghiano^f ; M. Giammarchi^a ; M. Goeger-Neff^o ; A. Goretti^h ; L. Grandi^h ; C. Hagner^c ; E. Hungerford^j ; Aldo Ianni^d ; Andrea Ianni^h ; V.V. Kobychev^p ; D. Korablevⁿ ; G. Korga^j ; Y. Koshio^d ; D. Kryn^f ; M. Laubenstein^d ; T. Lewke^o ; E. Litvinovich^l ; B. Loer^h ; P. Lombardi^a ; F. Lombardi^d ; L. Ludhova^a ; G. Lukyanchenko^l ; I. Machulin^l ; S. Manecki^e ; W. Maneschg^q ; F. Mantovani^m ; G. Manuzio^r ; Q. Meindl^o ; E. Meroni^a ; L. Miramonti^a ; M. Misiaszek^s ; P. Mosteiro^h ; V. Muratova^k ; L. Oberauer^o ; M. Obolensky^f ; F. Ortica^t ; K. Otis^g ; M. Pallavicini^r ; L. Papp^e ; L. Perasso^r ; S. Perasso^r ; A. Pocar^g ; G. Ranucci^a ; A. Razeto^d ; A. Re^a ; B. Ricci^m ; A. Romani^t ; N. Rossi^d ; A. Sabelnikov^l ; R. Saldanha^h ; C. Salvo^r ; S. Schö ; nert^o ; H. Simgen^q ; M. Skorokhvatov^l ; O. Smirnovⁿ ; A. Sotnikovⁿ ; S. Sukhotin^l ; Y. Suvorov^u ; ^l ; R. Tartaglia^d ; G. Testera^r ; D. Vignaud^f ; R.B. Vogelaar^e ; F. von Feilitzsch^o ; J. Winter^o ; M. Wojcik^s ; A. Wright^h ; M. Wurm^c ; J. Xu^h ; O. Zaimidorogaⁿ ; S. Zavatarelli^r ; G. Zuzel^s
• 关键词：Geo-neutrino ; Radiogenic heat ; Neutrino detector ; Anti-neutrinos from reactors
• 刊名：Physics Letters B
• 出版年：2013
• 出版时间：24 May, 2013
• 年：2013
• 卷：722
• 期：4-5
• 页码：295-300
• 全文大小：319 K

文摘

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 proton ¡Á year after all selection cuts and background subtraction, we detected geo-neutrino events assuming a fixed chondritic mass Th/U ratio of 3.9. This corresponds to a geo-neutrino signal with just a probability for a null geo-neutrino measurement. With U and Th left as free parameters in the fit, the relative signals are and . Borexino data alone are compatible with a mantle geo-neutrino signal of , while a combined analysis with the KamLAND data allows to extract a mantle signal of . Our measurement of reactor anti-neutrino events is in agreement with expectations in the presence of neutrino oscillations.