Münster 2017 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 108: Neutrinophysik 9 (sterile Neutrinos)

T 108.1: Gruppenbericht

Donnerstag, 30. März 2017, 16:45–17:05, VSH 118

Search for eV Sterile Neutrinos – The Stereo Experiment — •Julia Haser, Helena Almazán, Christian Buck, Manfred Lindner, Christian Roca, and Stefan Schoppmann — Max-Planck-Institut für Kernphysik, Heidelberg

In the recent past major milestones in neutrino physics were accomplished at nuclear reactors: the smallest neutrino mixing angle θ₁₃ was determined with high precision and the emitted antineutrino spectrum was measured with unprecedented resolution. However, two anomalies – related to the absolute flux and the spectral shape – have yet to be solved. The flux anomaly is known as reactor antineutrino anomaly and could be caused by the existence of a light sterile neutrino participating in the neutrino oscillation phenomenon. Introducing a sterile eigenstate implies the presence of a fourth mass eigenstate and global fits favor sin²2θ = 0.09 and Δ m² = 1.8 eV² as oscillation parameters.
The Stereo experiment was built to finally solve this puzzle. It is one of the first running experiments built to search for eV sterile neutrinos and takes data since end of 2016 at ILL Grenoble (France). At a short baseline of 10 meters it measures the antineutrino flux and spectrum emitted by a compact research reactor. The segmentation of the detector in six target cells allows for independent measurements of the neutrino spectrum at multiple baselines. An active-sterile flavor oscillation could be unambiguously detected, as it distorts the spectral shape of each cell’s measurement differently.
This talk will give an overview of the Stereo experiment, including details on the detector design, detection principle and the current status.