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T: Fachverband Teilchenphysik
T 36: Neutrino physics without accelerators III
T 36.2: Vortrag
Dienstag, 31. März 2020, 17:15–17:30, L-2.004
Reduction of the 14C-background in the JUNO experiment — •Philipp Kampmann1,2, Christoph Genster1, Alexandre Göttel1,2, Yuhang Guo1,3, Ruquan Liu1,2, Livia Ludhova1,2, Giulio Settanta1, Cornelius Vollbrecht1,2, and Yu Xu1,2 — 1Institut für Kernphysik, Forschungszentrum Jülich — 2III. Physikalisches Institut B, RWTH Aachen University — 3School of Nuclear Science and Technology, Xi’an Jiaotong University, Xi’an 710049, China
The Jiangmen Underground Neutrino Observatory (JUNO) is a next-generation neutrino experiment under construction in China expected to complete the construction in late 2021. As the main goal it aims to address the determination of the neutrino mass hierarchy with 3-4 σ significance in 6 years. Therefore, it will measure the oscillated energy spectrum of electron anti-neutrinos from two nuclear power plants at 53 km baseline with an unprecedented energy resolution of 3% at 1 MeV using a 20 kt liquid scintillator detector. Due to the large target size the probability of event pile-up with internal background events such as from 14C decays is high. This can spoil the resolution of the reconstructed neutrino energies, which is a major systematic uncertainty in the mass hierarchy search of JUNO. In this presentation reconstruction techniques to reduce the impact of the 14C pile-up will be presented. These include a Clusterization algorithm as well as an event reconstruction Likelihood-test of the photon hits.