Journal of Instrumentation
Journal of Instrumentation
5 years ago

Development of a tagged source of Pb-206 nuclei

There is a particular class of unavoidable backgrounds that plague low-background experiments and rare event searches, particularly those searching for nuclear recoil event signatures: decaying daughters of the 238 U nuclear decay chain, which result from radon plate-out on detector materials. One such daughter isotope, 210 Po, undergoes α-decay and produces a recoiling 103 keV 206 Pb nucleus. To characterize this important background in the context of noble element detectors, we have implemented a triggered source for these 206 Pb recoils in a dual-phase xenon time projection chamber (Xe TPC) within the Da vis X enon R&D testbed system (DAX). By adhering 210 Po to the surface of a PIN diode and electrically floating the diode on the cathode of the TPC, we tag the α signals produced in the PIN diode and trigger on the correlated nuclear recoils in the liquid xenon (LXe). We discuss our met...

Publisher URL: http://iopscience.iop.org/1748-0221/13/02/C02017

DOI: 10.1088/1748-0221/13/02/C02017

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