Würzburg 2018 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 92: Neutrinophysik IV

T 92.7: Vortrag

Donnerstag, 22. März 2018, 18:10–18:25, Z6 - SR 2.012

Calibration of the Stereo Experiment — •Christian Roca, Helena Almazán, Christian Buck, Julia Haser, Manfred Lindner, and Stefan Schoppmann — Max-Planck-Institut für Kernphysik

The Stereo experiment, running since November 2016 at the ILL Grenoble, aims to test the hypothesis of sterile neutrinos being the cause of the reactor antineutrino anomaly observed at short baselines. The detector is divided in two main volumes each filled with liquid scintillator. The inner volume is segmented in six independent cells corresponding to the neutrino target (TG). It is doped with gadolinium to enhance the detection of the correlated signal produced by the inverse beta decay. Surrounding the TG there is the gamma catcher (GC) volume, optimized to capture escaping gammas originating from interactions in the TG. The energy deposited in the detector is measured as scintillation light that is collected by a set of photomultiplier tubes. The readout charge signals are converted to visible energy by a dedicated non-linear energy scale. To determine the energy scale, detection efficiency and to observe the detector stability, several gamma and neutron sources have been deployed by means of three different calibration systems: an internal set of tubes located within the TG cells, a central rail underneath the detector crossing the TG and GC volume, and an outer pantograph-rail system for 2d calibration around the GC. The calibration runs performed during the phases I and II of Stereo and their use on the energy scale and detection efficiency determination are discussed in this talk.