Background Rejection through Pulse Shape Discrimination in the Majorana Demonstrator
ORAL
Abstract
The Majorana Demonstrator is an experiment searching for neutrinoless double-beta decay in $^{\mathrm{76}}$Ge. The experiment consists of two modular arrays with 44.8 kg of high purity Germanium detectors operating at the 4850' level of the Sanford Underground Research Facility in Lead, South Dakota. P-type point contact detector technology allows for the identification and rejection of specific background event populations through an analysis of pulse shape characteristics. Relating the amplitude (A) of the current pulse and the total energy(E) collected defines an AvsE pulse shape parameter. We present the performance and improvements to our multi-site Compton-scattered gamma background rejection with the AvsE cut parameter, systematics concerning the cut, and show its influence on the sensitivity of the experiment.
*This material is based upon work supported by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics, the Particle Astrophysics and Nuclear Physics Programs of the National Science Foundation, and the Sanford Underground Research Facility.
–