/ Experiment-HEP arXiv:1010.0029


Study of solar and other unknown anti-neutrino fluxes with Borexino at LNGS


Bellini, G. (INFN, Milan) ; Benziger, J. (Princeton U., Chem. Eng. Dept.) ; Bonetti, S. (INFN, Milan) ; Buizza Avanzini, M. (INFN, Milan) ; Caccianiga, B. (INFN, Milan) ; Cadonati, L. (Massachusetts U., Amherst) ; Calaprice, F. (Princeton U.) ; Carraro, C. (INFN, Genoa) ; Chavarria, A. (Princeton U.) ; Chepurnov, A. (SINP, Moscow) ; D'Angelo, D. (INFN, Milan) ; Davini, S. (INFN, Genoa) ; Derbin, A. (St. Petersburg, INP) ; Etenko, A. (Kurchatov Inst., Moscow) ; Fomenko, K. (Gran Sasso) ; Franco, D. (INFN, Milan) ; Galbiati, C. (Princeton U.) ; Gazzana, S. (Gran Sasso) ; Ghiano, C. (Gran Sasso) ; Giammarchi, M. (INFN, Milan) ; Goeger-Neff, M. (Munich, Tech. U.) ; Goretti, A. (Princeton U.) ; Guardincerri, E. (INFN, Genoa) ; Hardy, S. (Virginia Tech.) ; Ianni, Aldo (Gran Sasso) ; Ianni, Andrea (Princeton U.) ; Joyce, M. (Virginia Tech.) ; Kobychev, V.V. (Kiev, INR) ; Korablev, D. (Dubna, JINR) ; Koshio, Y. (Gran Sasso) ; Korga, G. (Gran Sasso) ; Kryn, D. (APC, Paris) ; Laubenstein, M. (Gran Sasso) ; Lewke, T. (Munich, Tech. U.) ; Litvinovich, E. (Kurchatov Inst., Moscow) ; Loer, B. (Princeton U.) ; Lombardi, P. (INFN, Milan) ; Ludhova, L. (INFN, Milan) ; Machulin, I. (Kurchatov Inst., Moscow) ; Manecki, S. (Virginia Tech.) ; Maneschg, W. (Heidelberg, Max Planck Inst.) ; Manuzio, G. (INFN, Genoa) ; Meindl, Q. (Munich, Tech. U.) ; Meroni, E. (INFN, Milan) ; Miramonti, L. (INFN, Milan) ; Misiaszek, M. (Jagiellonian U.) ; Montanari, D. (Princeton U.) ; Muratova, V. (St. Petersburg, INP) ; Oberauer, L. (Munich, Tech. U.) ; Obolensky, M. (APC, Paris) ; Ortica, F. (INFN, Perugia) ; Pallavicini, M. (INFN, Genoa) ; Papp, L. (Gran Sasso) ; Perasso, L. (INFN, Milan) ; Perasso, S. (INFN, Genoa) ; Pocar, A. (Massachusetts U., Amherst) ; Raghavan, R.S. (Virginia Tech.) ; Ranucci, G. (INFN, Milan) ; Razeto, A. (Gran Sasso) ; Re, A. (INFN, Milan) ; Risso, P. (INFN, Genoa) ; Romani, A. (INFN, Perugia) ; Rountree, D. (Virginia Tech.) ; Sabelnikov, A. (Kurchatov Inst., Moscow) ; Saldanha, R. (Princeton U.) ; Salvo, C. (INFN, Genoa) ; Schonert, S. (Heidelberg, Max Planck Inst.) ; Simgen, H. (Heidelberg, Max Planck Inst.) ; Skorokhvatov, M. (Kurchatov Inst., Moscow) ; Smirnov, O. (Dubna, JINR) ; Sotnikov, A. (Dubna, JINR) ; Sukhotin, S. (Kurchatov Inst., Moscow) ; Suvorov, Y. (Gran Sasso) ; Tartaglia, R. (Gran Sasso) ; Testera, G. (INFN, Genoa) ; Vignaud, D. (APC, Paris) ; Vogelaar, R.B. (Virginia Tech.) ; von Feilitzsch, F. (Munich, Tech. U.) ; Winter, J. (Munich, Tech. U.) ; Wojcik, M. (Jagiellonian U.) ; Wright, A. (Princeton U.) ; Wurm, M. (Munich, Tech. U.) ; Xu, J. (Princeton U.) ; Zaimidoroga, O. (Dubna, JINR) ; Zavatarelli, S. (INFN, Genoa) ; Zuzel, G. (Heidelberg, Max Planck Inst.)

Published in: Phys.Lett.
Year: 2011
Vol.: B696
Page No: 191-196
Pages: 8

Abstract: We report on the search for anti-neutrinos of yet unknown origin with the Borexino detector at the Laboratori Nazionali del Gran Sasso. In particular, a hypothetical anti-neutrino flux from the Sun is investigated. Anti-neutrinos are detected through the neutron inverse $\beta$ decay reaction in a large liquid organic scintillator target. We set a new upper limit for a hypothetical solar $\bar{\nu}_e$ flux of 760 ${\rm cm}^{-2}{\rm s}^{-1}$, obtained assuming an undistorted solar $^8$B energy spectrum. This corresponds to a limit on the transition probability of solar neutrinos to anti-neutrinos of $1.3\times10^{-4}$ (90\% C.L.) for $E_{\bar{\nu}}>1.8$ MeV, covering the entire $^{8}$B spectrum. Best differential limits on anti-neutrino fluxes from unknown sources are also obtained between the detection energy threshold of 1.8 MeV and 17.8 MeV with more than 2 years of data.

Keyword(s): Anti-neutrinos ; Solar neutrinos ; Neutrino detector ; Liquid scintillator

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