Würzburg 2018 – scientific programme

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T: Fachverband Teilchenphysik

T 68: Neutrinophysik III

T 68.4: Talk

Wednesday, March 21, 2018, 17:15–17:30, Z6 - SR 2.012

Solar neutrino analysis with the Borexino detector — •Mariia Redchuk and Livia Ludhova for the Borexino collaboration — IKP-2 Forschungszentrum Jülich, Jüilch, Germany

Borexino is a liquid scintillator detector the primary goal of which is measuring the flux of neutrinos coming from the un. It is located in the Laboratori Nazionali del Gran Sasso (LNGS) in the mountains of Italy at 3800 m water-equivalent depth. In 2012 Borexino started Phase-II of data taking which is characterized by its higher sensitivity. This was made possible due to extensive purification campaigns in 2010 and 2011 after which the already unprecedentedly low radioactive background of the detector was improved even more.

In the recent analysis of Phase-II data, for the first time the energy range of the fit was extended in order to obtain information about the pp, 7Be, and pep solar neutrinos simultaneously. To determine the rates of the background and the solar species, multivariate fits have been performed on the Borexino energy spectra, the radial and pulse-shape distributions of the events. Monte Carlo as well as analytical approaches were used in the analysis.

The highlights of the Phase-II data analysis and updated results on the measurement of the solar neutrino fluxes will be summarized in this talk.