Heidelberg 2022 – scientific programme
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T: Fachverband Teilchenphysik
T 96: Detector Systems 3
T 96.3: Talk
Thursday, March 24, 2022, 16:45–17:00, T-H27
Irradiation studies for the Mu3e tile detector — •Tiancheng Zhong for the Mu3e collaboration — Kirchhoff-Institut für Physik, Universität Heidelberg, Heidelberg, Germany
The Mu3e experiment is designed to search for the decay µ+→e+e+e− with a sensitivity of 10−16, which would be a clear signal for new physics beyond the Standard Model. To reduce the combinatorial background from muon decays while efficiently identifying 3-electron final states, a scintillating-tile detector with a required timing resolution < 100 ps and efficiency close to 100% is under development.
Irradiation damage and effects on Silicon Photomultiplier (SiPM) used in the tile detector were investigated by exposing the sensors to the decay electrons from stopped muons at the PiE5 beamline at PSI. For the SiPMs irradiated with a dose up to 1.57×1011 1 MeV neq/cm2, corresponding to 70% of the maximum dose of the Mu3e Phase I run, the dark current increased by a factor up to 1000. We will report on the irradiation campaign performed, measurements of dark current and impact on annealing at different temperatures. The timing performance after irradiation was investigated in testbeam campaigns at DESY and will also be discussed.