Wuppertal 2015 – scientific programme

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T: Fachverband Teilchenphysik

T 53: Niederenergie Neutrinophysik III

T 53.5: Talk

Tuesday, March 10, 2015, 17:55–18:10, I.12.01 (HS 30)

Recent Borexino results and prospects for the near future — •Simon Appel, Matteo Agostini, Konrad Altenmüller, Marianne Göger-Neff, Dominik Jeschke, Laszlo Papp, Birgit Neumair, Lothar Oberauer, and Stefan Schönert for the Borexino collaboration — Technische Universität München, Physik Department E15, James Franck Straße, 85748 Garching

The Sun is an intense source of neutrinos, produced in nuclear reactions of the p-p chain and of the CNO cycle. Measurements of the individual neutrino fluxes is of paramount importance for both particle physics and astrophysics. Up to a few years ago, spectroscopical measurements were performed by water Cherenkov detectors above 5MeV and concerned only ⁸B neutrinos for less then 1% of the total flux. The bulk of neutrinos at low energies were detected with radiochemical experiments, incapable of resolving the individual components. Neutrinos are emitted in the sun as electron flavour neutrinos and oscillate to a different flavour during the trajectory to the Earth. The MSW mechanism at Large Mixing Angle (LMA) foresees the survival probability for electron neutrinos on Earth. Borexino was designed to achieve spectroscopy of the low energy part of the solar neutrino spectrum, in particular the flux of the ⁷Be monochromatic line at 862keV. Borexino has largely exceeded the expected performance with the physics program broadening way past the original goal. This work is supported by DFG Funding OB 168/1-1, Maier-Leibnitz-Laboratorium and the Excellence Cluster Universe.