Abstract
The DarkSide-50 experiment is a direct detection dark matter search located in Gran Sasso National Laboratory (LNGS). It utilizes a liquid argon time projection chamber to search for weakly interacting massive particles (WIMPS) in the low energy region below 100 keV. In order to understand any signals in this region and distinguish WIMP candidate events from background, it is necessary to perform a precise calibration between scintillation light yield and energy deposited in the detector. Presented here are the results of a calibration using the 565 keV endpoint 39Ar beta spectrum together with a 41.5 keV 83mKr gamma peak. Because the detector is operated under an applied electric fields, additional fieldand energy-dependence can affect the calibration in this energy regime. A method to correct for the energy dependence of the light yield is studied and the systematic uncertainty introduced by the fit is analyzed in detail.
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