Bulletin of the American Physical Society
APS April Meeting 2019
Volume 64, Number 3
Saturday–Tuesday, April 13–16, 2019; Denver, Colorado
Session J10: Tonne Scale Neutrinoless Double Beta Decay R&D IV
1:30 PM–3:18 PM,
Sunday, April 14, 2019
Sheraton
Room: Governor's Square 12
Sponsoring
Units:
DNP DPF
Chair: Jason Detwiler, University of Washington
Abstract: J10.00003 : Performance Analysis and Operation of the EXO-200 Muon Veto System*
1:54 PM–2:06 PM
Presenter:
Mitchell Hughes
(The University of Alabama)
Author:
Mitchell Hughes
(The University of Alabama)
The EXO-200 experiment implemented a single-phase time projection chamber (TPC) as the combined source and detector for a neutrinoless double-beta decay search in isotopically enriched $^{136}$Xe. Despite being emplaced roughly 655 m underground at the Waste Isolation Pilot Plant near Carlsbad, NM, atmospheric muons still represented a significant background. In order to tag incoming muons and prompt decays, a muon veto system comprising 29 large plastic scintillator panels surrounded the TPC cleanroom on four sides. Throughout the lifetime of EXO-200, the muon veto system was monitored continuously to ensure acceptable performance and deadtime contributions. These measures included semi-annual calibration campaigns using a sealed radioactive source, the fitting of Landau peaks in underground muon spectra, and a battery of studies on ROI background impact, trigger efficiency, and rate for each veto system channel. Methods and conclusions from these studies will be discussed.
*This work has been supported, in the US, by DOE's Office of Nuclear Physics within the Office of Science and the National Science Foundation.
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