Bonn 2020 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 7: Neutrino physics without accelerators II

T 7.6: Vortrag

Montag, 30. März 2020, 17:50–18:05, H-HS V

Event Discrimination with Topological 3D Reconstruction at MeV Energies in the JUNO Experiment — •Henning Rebber, Malte Stender, David Meyhöfer, Björn Wonsak, and Caren Hagner — Universität Hamburg

The JUNO experiment will use an unsegmented tank filled with 20 kton liquid scintillator to detect neutrinos and antineutrinos, starting from 2021. An important goal is to answer the open question of neutrino mass ordering by measuring electron-antineutrinos from two nuclear power plants in ∼ 53 km distance. A further goal is to measure solar 7Be and 8B neutrinos at high rates. The reactor antineutrinos are identified by means of inverse beta decay (IBD) which leads to a prompt positron and a delayed neutron signal. However, β-decays of cosmogenic 8He and 9Li can be accompanied by neutron emission and thus mimic the IBD signature. Solar neutrinos are detected via elastic scattering off electrons. The cosmogenic β+-emitters 10C and 11C are a major background here. In any case, a discrimination between electron and positron events would mean a background reduction.

The event discrimination is based on topological differences between the energy deposition of MeV electrons and positrons. The electron events are more point-like than positron events due to the latter emitting two annihilation gammas. A topological 3D reconstruction was applied to Geant4-simulated data in order to visualise the resulting fine differences in the time spectrum of PMT hits. The potential towards a discrimination between electrons and positrons, gammas, and 10C decays, respectively, will be presented.

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