Measuring Electron Response in NaI(Tl) using Compton Coincidence Technique

The scintillation efficiency of electron recoils in liquid xenon (LXe) is not well measured at low energies. The Compton coincidence technique (CCT) is set up using a NaI(Tl) detector and HPGe detector to measure the energy dependence of the light yield in the NaI(Tl) detector from which we can extract the scintillation effieciency. This technique allows for the detection of low energy electron recoils and the non-proportional response of the material. Eventually the material will be replaced with LXe to measure both the electron recoil and nuclear recoil response as a function of deposited energy. This will aid in the distinction between electron and nuclear recoil interactions with LXe as well as improving our understanding of the mechanisms of energy deposition in LXe.