We report results from an extensive set of measurements of the $\beta$-decay response in liquid xenon. These measurements are derived from high-statistics calibration data from injected sources of both ${}^3\mathrm{H}$ and ${}^{14}\mathrm{C}$ in the LUX detector. The mean light-to-charge ratio is reported for 13 electric field values ranging from 43 to $491\mathrm{V}/\mathrm{cm}$, and for energies ranging from 1.5 to 145 keV.

• Received 2 April 2019

DOI:https://doi.org/10.1103/PhysRevD.100.022002