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T: Fachverband Teilchenphysik

T 75: Neutrino physics without accelerators VI

T 75.6: Vortrag

Donnerstag, 2. April 2020, 17:50–18:05, H-HS XIII

Search for eV Sterile Neutrinos - The STEREO Experiment — •Stefan Schoppmann for the STEREO collaboration — Max-Planck-Institut für Kernphysik, Heidelberg, Germany

In recent years, major milestones in neutrino physics were accomplished at nuclear reactors: the smallest neutrino mixing angle θ₁₃ was determined and the emitted antineutrino spectrum was measured at unprecedented detail. However, two anomalies, the first one related to the absolute flux and the second to the spectral shape, have yet to be solved. The flux anomaly is known as the Reactor Antineutrino Anomaly (RAA) and could be caused by the existence of a light sterile neutrino eigenstate participating in the neutrino oscillation phenomenon. The RAA is best explained by an oscillation with a mass splitting at the eV²-scale.

The STEREO experiment was built to probe this parameter region. At a short baseline of 10 metres, it measures the antineutrino flux and spectrum emitted by the compact research reactor at ILL Grenoble (France). The segmentation of the detector in six cells allows for independent measurements of the neutrino spectrum at multiple baselines. An active-sterile flavour oscillation could be unambiguously detected, as it distorts the spectral shape of each cell’s measurement differently. In 2018, STEREO was able to exclude significant parts of the parameter space with its initial dataset.

In this contribution, updated results on the oscillation analysis as well as the absolute rate and shape of antineutrinos will be presented with the factor 3 increased dataset of 179 (235) days of reactor-on (off).