title: Energy non-linearity studies and pulse shape analysis of liquid scintillator signals in the Double Chooz experiment
creator: Wagner, Stefan
subject: 530
subject: 530 Physics
description: The Double Chooz reactor neutrino experiment measures the neutrino mixing angle Theta13 with a liquid scintillation detector. It uses the electron antineutrino flux as well as their energy spectrum in the analysis of Theta13, which requires a detailed knowledge of the energy scale. In particular the non-linear scintillator response caused by ionization quenching and Cerenkov light has to be accurately reproduced in the Monte Carlo. To this end the relevant properties of the liquid scintillators are investigated experimentally and theoretically.  For the data analysis the pulse shape of the scintillator emission is exploited for particle identification. A novel classifier is presented which characterizes the pulse shape  in Fourier space. It allows to distinguish between the detector volumes as well as to reduce the stopping muon background. A more advanced version of this technique is  then investigated for pulse shape discrimination between positron and electron events. It has a high efficiency for electron antineutrinos and can be used to reject remaining background in the Double Chooz analysis. The method thus increases the signal-to-background ratio, which may be a  tremendous advantage for analyses with neutron captures on Hydrogen.
date: 2014
type: Dissertation
type: info:eu-repo/semantics/doctoralThesis
type: NonPeerReviewed
format: application/pdf
identifier: https://archiv.ub.uni-heidelberg.de/volltextserverhttps://archiv.ub.uni-heidelberg.de/volltextserver/16900/1/Dissertation_Stefan_Wagner.pdf
identifier: DOI:10.11588/heidok.00016900
identifier: urn:nbn:de:bsz:16-heidok-169008
identifier:   Wagner, Stefan  (2014) Energy non-linearity studies and pulse shape analysis of liquid scintillator signals in the Double Chooz experiment.  [Dissertation]     
relation: https://archiv.ub.uni-heidelberg.de/volltextserver/16900/
rights: info:eu-repo/semantics/openAccess
rights: Please see front page of the work (Sorry, Dublin Core plugin does not recognise license id)
language: eng