Bonn 2020 – scientific programme
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T: Fachverband Teilchenphysik
T 37: Neutrino physics without accelerators IV
T 37.6: Talk
Tuesday, March 31, 2020, 18:15–18:30, L-2.017
Evaluation of the Neutron Detection Efficiency in the STEREO Reactor Neutrino Experiment — •Helena Almazan, Aurelie Bonhomme, Christian Buck, Manfred Lindner, Christian Roca, and Stefan Schoppmann — Max-Planck-Institut für Kernphysik, Heidelberg, Germany
The STEREO detector is measuring electron antineutrinos from the research reactor at the Institut Laue-Langevin (Grenoble, France). Located at 10 m 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, νe + p → e+ + n, 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 target, and has been used to study the properties of the neutron detection with high accuracy. This talk is focused on presenting the most relevant properties of the neutron efficiency, and to test the modelisation of the gamma cascade emitted after a neutron capture on gadolinium (nuclei present in the liquid scintillator), providing thus a crucial input in the analysis of the STEREO experiment.