Using a Pile-up Simulation to Characterize Detector Resolution in Mu2e's Stopping Target Monitor

The Mu2e experiment will search for coherent neutrino-less conversion of muons to electrons in muonic aluminum. The Mu2e Stopping Target Monitor employs two detectors optimized to detect photons from 100 keV up to a few MeV. One is a high-purity Germanium diode (HPGe), and the other is a Lanthanum Bromide (LaBr) scintillator detector; they will measure x-rays and gamma rays ejected from the Mu2e stopping target to count the number of stopped muons. LaBr is used to mitigate the effects of pile-up in high-rate data, since HPGe is susceptible to over-saturation in a high-rate environment. In this presentation, I present the performance of LaBr in a pile-up simulation, characterizing how the resolution of a 662 keV Cs source is affected by how close successive pulses are from each other.