TY  - THES
AU  - Lorenz, Sebastian
TI  - Topological Track Reconstruction in Liquid Scintillator and LENA as a Far-Detector in an LBNO Experiment
IS  - DESY-THESIS-2016-037
SN  - 1435-8085
PB  - Universität Hamburg
VL  - Dissertation
CY  - Hamburg
M1  - PUBDB-2016-06366
M1  - DESY-THESIS-2016-037
T2  - DESY-THESIS
SP  - 230
PY  - 2016
N1  - Dissertation, Universität Hamburg, 2016
AB  - Unsegmented liquid scintillator (LSc) neutrino detectors have proven to be successful instruments of neutrino physics. They usually measure terrestrial and astrophysical low-energy (LE) neutrinos and antineutrinos with energies up to some tens of MeV. Designs for next-generation detectors based on this technology intend to use several tens of kilotons of LSc. Two examples are the Low Energy Neutrino Astronomy (LENA) project with 50 kt considered in Europe and the Jiangmen Underground Neutrino Observatory (JUNO) with 20 kt already under construction in China. A key factor to reach the scientific goals of these projects, e.g., the determination of the neutrino mass ordering (MO) in the case of JUNO, will be the efficient rejection of background from radioisotopes produced by cosmogenic muons. This requires accurate reconstructions of extended muon event topologies in the LSc volume.The first part of this work is about the implementation of a novel, iterative track reconstruction procedure for unsegmented LSc detectors and a basic evaluation of its performance with the LENA detector simulation. The ultimate goal of the new method is to reconstruct the spatial number density distribution of optical photon emissions. This will give access to a charged particle's differential energy loss dE / dx in LSc and resolve details of an event's topology, e.g., induced particle showers. Visual comparisons of reconstruction outcomes with Monte Carlo (MC) truths already provide evidence for this capability. First quantitative results were extracted from the 3D reconstruction data of fully-contained muons in the kinetic energy range from 1 to 10 GeV: Despite some well understood systematic effects in the current method to find start and end point of a track, resolutions ≲ 25 cm lateral to the reconstructed track were ascertained for these spots. The determined angular resolution of ∼1.4° at 1 GeV improves to ∼0.3° with rising muon energy. With the current analysis method, the relative energy resolution approximately follows 10
LB  - PUB:(DE-HGF)3 ; PUB:(DE-HGF)29 ; PUB:(DE-HGF)11
DO  - DOI:10.3204/PUBDB-2016-06366
UR  - https://bib-pubdb1.desy.de/record/316167
ER  -