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

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 β decay reaction in a large l...

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Bibliographic Details
Published in:Physics letters. B 2011-01, Vol.696 (3), p.191-196
Main Authors: Bellini, G., Benziger, J., Bonetti, S., Buizza Avanzini, M., Caccianiga, B., Cadonati, L., Calaprice, F., Carraro, C., Chavarria, A., Chepurnov, A., D'Angelo, D., Davini, S., Derbin, A., Etenko, A., Fomenko, K., Franco, D., Galbiati, C., Gazzana, S., Ghiano, C., Giammarchi, M., Goeger-Neff, M., Goretti, A., Guardincerri, E., Hardy, S., Ianni, Aldo, Ianni, Andrea, Joyce, M., Kobychev, V.V., Korablev, D., Koshio, Y., Korga, G., Kryn, D., Laubenstein, M., Lewke, T., Litvinovich, E., Loer, B., Lombardi, P., Ludhova, L., Machulin, I., Manecki, S., Maneschg, W., Manuzio, G., Meindl, Q., Meroni, E., Miramonti, L., Misiaszek, M., Montanari, D., Muratova, V., Oberauer, L., Obolensky, M., Ortica, F., Pallavicini, M., Papp, L., Perasso, L., Perasso, S., Pocar, A., Raghavan, R.S., Ranucci, G., Razeto, A., Re, A., Risso, P., Romani, A., Rountree, D., Sabelnikov, A., Saldanha, R., Salvo, C., Schönert, S., Simgen, H., Skorokhvatov, M., Smirnov, O., Sotnikov, A., Sukhotin, S., Suvorov, Y., Tartaglia, R., Testera, G., Vignaud, D., Vogelaar, R.B., von Feilitzsch, F., Winter, J., Wojcik, M., Wright, A., Wurm, M., Xu, J., Zaimidoroga, O., Zavatarelli, S., Zuzel, G.
Format: Article
Language:English
Subjects:
Anti-neutrinos
Antiparticles
Decay
Elementary particles
Exact sciences and technology
Fluxes
High Energy Physics - Experiment
Inverse
Liquid scintillator
Liquids
Neutrino detector
Nuclear physics
Origins
Physics
Solar neutrinos
The physics of elementary particles and fields
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Summary: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 β decay reaction in a large liquid organic scintillator target. We set a new upper limit for a hypothetical solar ν¯e flux of 760 cm−2s−1, obtained assuming an undistorted solar 8B energy spectrum. This corresponds to a limit on the transition probability of solar neutrinos to anti-neutrinos of 1.3×10−4 (90% C.L.) for Eν¯>1.8 MeV, covering the entire 8B 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.
ISSN:0370-2693
1873-2445
DOI:10.1016/j.physletb.2010.12.030