Abstract
The LUX experiment was based on a liquid-xenon time-projection chamber that was located on the 4,850’ level of the Sanford Underground Research Facility until it was decommissioned in 2016. In total, the LUX detector contained about 370 kg of xenon, 250 kg of which was active. LUX was designed primarily to detect WIMP dark matter, and produced world-leading limits on the WIMP scattering cross section. In this presentation, I report results from an extensive set of measurements of the β-decay response in liquid xenon. These measurements are derived from high-statistics calibration data from injected sources of both tritium and carbon-14 in the LUX detector after the WIMP-search runs had been completed. The mean light-to-charge ratio is reported for 13 electric field values ranging from 43 to 491 V/cm, and for energies ranging from 1.5 to 145 keV.
Highlights
The Large Underground Xenon experiment (LUX) was a liquid-xenon (LXe) time-projection chamber (TPC)
We limit the range of drift times that are drawn from so that a bin does not extend past the central drift-time values of its adjacent bins
In order to estimate these smearing corrections, the charge and light yield is initially taken from the NEST model [7,27,28], and an initial set of Monte Carlo (MC) S1 and S2 data is generated
Summary
The Large Underground Xenon experiment (LUX) was a liquid-xenon (LXe) time-projection chamber (TPC). It is important to understand the β-decay-induced light and charge yields in LXe as a function of electric field and energy. Previous measurements of these yields using LUX WS2013 data, including a set of measurements using a 3H injection source at both 105 and 180 V=cm were reported in Refs. The activities used in post-WS calibrations were allowed to be significantly greater than previous calibrations because maintaining low detector backgrounds was no longer a requirement This resulted in a data set of roughly 2 million 14C events. A separate post-WS 3H data set is analyzed, which has about one third of the number of events as the 14C set
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