Dortmund 2021 – scientific programme

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T: Fachverband Teilchenphysik

T 92: Neutrino astronomy IV

T 92.8: Talk

Thursday, March 18, 2021, 17:45–18:00, Tq

Directional reconstruction of solar ⁷Be neutrinos in Borexino — •Johann Martyn for the Borexino collaboration — Johannes Gutenberg-Universität Mainz

The Borexino detector is a liquid scintillator detector with a high radio-purity and a light yield of ≈ 12000 photons/MeV with the main goal of measuring the entire spectrum of solar neutrinos from very low energies (>150 keV). While the method of using the directional information of Čerenkov photons is readily used to discriminate between signal and background in water based detectors on an event-by-event basis this cannot be done in Borexino due to its large scintillation light yield and a relative fast scintillation time. In this talk we present a novel approach of directional analysis where the PMT hit patterns are summed up for a large number of events and plotted versus the angle of the known position of the sun and the direction of the photons given by the reconstructed event vertex and the PMT position. We use the ⁷Be neutrino energy region to investigate if it is possible to use this cumulative method to distinguish between directional neutrino signal and isotropic radioactive background.

This work is supported by the Cluster of Excellence PRISMA+.