Münster 2017 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 108: Neutrinophysik 9 (sterile Neutrinos)

T 108.7: Vortrag

Donnerstag, 30. März 2017, 18:25–18:40, VSH 118

Calibration and energy scale reconstruction in the Stereo experiment — •Christian Roca, Helena Almazan, Christian Buck, Julia Haser, Manfred Lindner, and Stefan Schoppmann — Max-Planck-Institut für Kernphysik Heidelberg

The Stereo experiment, running since November 2016 at the ILL Grenoble, aims to test the hypothesis of sterile neutrinos as a possible the cause of the reactor antineutrino anomaly at short baselines. The detector is divided in two main volumes each filled with liquid scintillator. The central volume is segmented in six independent cells corresponding to the neutrino target (NT). Its scintillator is doped with gadolinium to enhance the detection of the correlated neutrino signal produced by the inverse beta decay. Surrounding the NT there is the outer crown (OC) volume, optimized to capture escaping gammas originating from interactions in the NT.

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 linked to visible energy by a non-linear energy scale. To determine such energy scale and to monitor the detector stability, several gamma and neutron sources are deployed by means of three different calibration systems: an internal set of tubes located within the NT cells, a single tube underneath the detector to introduce sources below the NT and OC, and a rail system optimized for OC calibration.

The calibration runs performed provided Stereo with a better understanding of the detector response and an energy scale reconstruction that will be presented in this talk.