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T: Fachverband Teilchenphysik
T 103: Neutrino Physics without Accelerators 8
T 103.3: Vortrag
Donnerstag, 24. März 2022, 16:45–17:00, T-H35
Analysis strategies used in directional analysis of sub-MeV solar neutrinos in liquid scintillator detector — •Apeksha Singhal1,3, Alexandre Göttel1,3, Sindhujha Kumaran1,3, Livia Ludhova1,3, Luca Pelicci1,3, Ömer Penek1,3, and Antonia Weßel2,3 — 1Forschungszentrum Jülich GmbH, Nuclear Physics Institute IKP-2, Jülich, Germany — 2GSI Helmholtzcentre for Heavy Ion Reseach, Darmstadt, Germany — 3III. Physikalisches Institut B, RWTH Aachen University, Aachen, Germany
The sub-MeV solar neutrinos are measured in a liquid scintillator detector via their elastic scattering off electrons, which induce isotropically emitted scintillation photons that are detected by PMTs. Borexino, located at the LNGS in Italy, is liquid scintillator detector that performed real time spectroscopy of solar neutrinos from pp chain and CNO fusion cycle of the Sun. For first time, it is possible with Borexino to disentangle sub-MeV solar neutrinos detected in liquid scintillator using few Cherenkov photons emitted at early times, and in direction of scattered electrons with given energy threshold. The directional solar neutrino signal is statistically discriminated from isotropic background events by correlating well known position of the Sun and the direction of the first two time-of-flight subtracted hits of each event, with respect to the reconstructed vertex. This results in angular distribution of data, fitted with signal and background distributions from Monte Carlo simulations. This talk will describe analysis strategy used to disentangle sub-MeV solar neutrino signal in data in a liquid scintillator detector. The future scope of this method will also be discussed.