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HK: Fachverband Physik der Hadronen und Kerne

HK 26: Instrumentation VII

HK 26.6: Vortrag

Dienstag, 29. März 2022, 17:15–17:30, HK-H3

Characterization of plastic scintillators with radioactive sources for the DarkMESA experiment — •Matteo Lauß for the MAGIX collaboration — Institute for Nuclear Physics, Mainz University, German

At the Institute for Nuclear Physics in Mainz the new electron accelerator MESA will go into operation within the next years. In the extracted beam operation (150 MeV, 150 µA) the P2 experiment will measure the weak mixing angle in electron-proton scattering in 10,000 hours operation time. The beam dump of this experiment is ideally suited for a parasitic dark sector experiment - the DarkMESA experiment. It is designed for the detection of Light Dark Matter (LDM) which in the simplest model couples to a massive vector particle, the dark photon γ’.

A highly efficient veto detector surrounding the calorimeter hermetically is essential to probe the target parameter space of DarkMESA successfully. The veto detector will mainly consist of plastic scintillation counters. A detector prototype is currently under construction using 2 cm thick plastic scintillators of type EJ-200 and a matrix of 5 × 5 lead fluoride crystal bars for the calorimeter. The measurement of the scintillation light is accomplished by silicon photomultipliers (SiPM) mounted on a specially designed electronic board. Systematic studies with a selection of commonly used radioactive sources were conducted to determine the homogeneity of the light yield across the scintillators. The light yield was determined by extracting the Compton edge for gamma emitters with an appropriate response function.