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TY - THES AU - Schoppmann, Stefan TI - First Measurement of θ<sub>13</sub> with the final two detector setup of the double chooz experiment PB - RWTH Aachen University VL - Dissertation CY - Aachen M1 - RWTH-2016-11063 SP - 1 Online-Ressource (xv, 141 Seite) : Illustrationen, Diagramme PY - 2016 N1 - Veröffentlicht auf dem Publikationsserver der RWTH Aachen University 2017 N1 - Dissertation, RWTH Aachen University, 2016 AB - The Double Chooz experiment is a reactor antineutrino disappearance experiment located at the nuclear power plant CHOOZ-B near the village of Chooz, France. The aim of the experiment is a high precision measurement of the neutrino oscillation amplitude sin<sup>2</sup>(2θ<sub>13</sub>). The experiment is built of two identical liquid scintillator detectors. They measure the neutrino oscillations on two distinct baselines using the flux of electron-antineutrinos originating from two nuclear reactors. After a single detector phase starting in 2011, the second detector has been commissioned in early 2015. In its first part, this work describes the design, implementation and commissioning of the data handling system responsible for the collection and transfer of the majority of the recorded experiment data. The system replaces the former single detector setup and provides several new fail-safe and diagnostic features. It is a multi-server MySQL-based setup interleaved with the laboratory systems in Chooz on the one end and the central computing facility of the in2p3 institute on the other end. The system is shown to have excellent performance allowing for both, unimpaired data acquisition in the laboratories and data processing in the computing centre. Additionally, the system is basis for an experiment-wide general purpose monitoring tool. In the second part of this work, a newly developed oscillation analysis approach for the Double Chooz data is presented. It utilises rate and spectral shape information. For the first time, it offers the possibility to include a full three flavour oscillation model into the oscillation analysis. Furthermore, a detailed treatment of energy scale non-linearities in the oscillation analysis is developed. Moreover, the novel adaptive modelling of spectral shape uncertainties reveals better insights to the treatment of the reactor flux uncertainties within the oscillation analysis. With the new approach, the first two detector data of the Double Chooz experiment is analysed in addition to the formerly recorded one-detector data. Due to the extended dataset, the Double Chooz experiment successfully confirms the existence of reactor antineutrino oscillations at the 6 σ confidence level. With the improved precision, this analysis presents a value for the oscillation amplitude of sin<sup>2</sup>(2θ<sub>13</sub>)=0.117±0.019 assuming ∆m<sub>ee</sub><sup>2</sup>=(2.44 ±0.09) ·10<sup>−3</sup>\texteV<sup>2</sup> and normal mass hierarchy. LB - PUB:(DE-HGF)11 DO - DOI:10.18154/RWTH-2016-11063 UR - https://publications.rwth-aachen.de/record/679278 ER -