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Evaluation of the Neutron Detection Efficiency in the Stereo Reactor Neutrino Experiment

Almazan Molina, Helena

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The Stereo detector is measuring electron antineutrinos from the research reactor at the Institut Laue-Langevin (Grenoble, France). Located at ∼10m from its core and with a segmented neutrino target, Stereo is searching for light sterile neutrino oscillations as a possible explanation for the Reactor Antineutrino Anomaly observed in 2011. An accurate determination of the detection efficiency of the correlated signal created by the electron antineutrino interaction called inverse beta decay (IBD) is needed to reach that goal. More concretely, a good understanding of the detection efficiency for the IBD neutrons is required, in both data and simulation, since it is one of the dominant systematic uncertainties of the Stereo analysis. An AmBe neutron source has been deployed throughout the different sub-volumes of the detector, and has been used to study the properties of the neutron detection with high accuracy. Among others, the selection cuts, neutron vertex dependencies and neutron capture models have been specially investigated along this thesis. The AmBe source has been used to test the modelisation of the gamma cascade emitted after a neutron capture on gadolinium (nuclei present in the liquid scintillator). This thesis is focused on studying the most relevant properties in terms of data-to-simulation correction coefficients, providing thus a crucial input in the oscillation analysis of the Stereo experiment.

Document type: Dissertation
Supervisor: Lindner, Prof. Dr. Dr. h.c. Manfred
Place of Publication: Heidelberg
Date of thesis defense: 5 February 2020
Date Deposited: 13 Feb 2020 06:43
Date: 2020
Faculties / Institutes: The Faculty of Physics and Astronomy > Dekanat der Fakultät für Physik und Astronomie
Service facilities > Max-Planck-Institute allgemein > MPI for Nuclear Physics
DDC-classification: 530 Physics
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