Münster 2017 – scientific programme

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T: Fachverband Teilchenphysik

T 107: Neutrinophysik 8

T 107.5: Talk

Thursday, March 30, 2017, 17:45–18:00, H 2

Current studies on solar neutrinos with Borexino — •Zara Bagdasarian for the Borexino collaboration — Forschungszentrum Jülich, Jülich, Germany

Borexino is located at the Laboratori Nazionali del Gran Sasso (LNGS) in Italy with the primary goal of detecting solar neutrinos, particularly those below 2 MeV with unprecedentedly high sensitivity. Its technical distinctive feature is the ultra low radioactive background of the inner scintillating core, which is the basis of the outstanding achievements obtained by the experiment. During the Phase I (2007-2010), Borexino precisely measured the flux of ⁷Be solar neutrinos, ruled out any significant day-night asymmetry of their interaction rate, made the first direct observation of the pep neutrinos, and set the best available upper limit on the flux of solar neutrinos produced in the CNO cycle (carbon, nitrogen, oxygen). The data gathered starting from 2011 (Phase II), characterized by even lower background than Phase I, is currently under detailed investigation. In order to update the previously published results, the fit on the whole energy spectrum of the Phase II data is performed, obtaining simultaneously all solar neutrino components.