Speaker
Description
The SABRE South experiment, currently being commissioned at the Stawell Underground Physics Laboratory (SUPL), will use high-purity NaI(Tl) crystals to investigate the seasonal modulation of dark matter. The cosmic muon flux, also expected to exhibit seasonal dependence, must be tagged and rejected to isolate the small signal. Eight EJ200 plastic scintillator panels, equipped with Hamamatsu R13089 PMT pairs at the ends, will be arranged in a planar configuration on top of SABRE South, covering an area of 9.6 m2. They will provide a muon veto system with fast timing characteristics.
This talk presents the measurement of the time-integrated muon flux at SUPL, relying on the SABRE South muon veto system and its data acquisition and processing pipeline. This study was conducted with approximately one year of data collected between 2024 and 2025, utilising the muon veto system arranged in a telescopic configuration. SUPL, located 1,025 metres below ground in Victoria, Australia, has a flat overburden, roughly 2.8 km of water equivalent, which will significantly reduce the muon background. The mine location facilitates a thorough understanding of the overburden, allowing tight constraints on systematic uncertainties through a muon flux simulation framework, which is also discussed in the talk.
| Collaboration you are representing | SABRE South |
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