Energy Calibration and Determination for the MAJORANA DEMONSTRATOR Experiment
ORAL
Abstract
The MAJORANA DEMONSTRATOR experiment is searching for neutrinoless double-beta decay ($0\nu\beta\beta$) in $^{76}$Ge. Currently operating at the 4850$^{'}$ level of the Sanford Underground Research Facility in Lead SD, the DEMONSTRATOR consists of two modular arrays with 44 kg of p-type point contact (PPC) high purity Germanium (HPGe) detectors, of which 30 kg is enriched to 88$\%$ in $^{76}$Ge. After a recent hardware upgrade and detector swap, the array now includes four (6.7 kg) of the larger inverted-coaxial point-contact (ICPC) detectors planned for the next-generation LEGEND experiment. The MAJORANA DEMONSTRATOR has achieved the best energy resolution of any current generation $0\nu\beta\beta$ experiment, which is 2.5 keV FWHM at the 2039 keV Q-value. Such an excellent energy resolution plays a key role in rare event searches and it is achieved through regular $^{228}$Th calibrations and well-developed energy determination methods. In this talk, I will discuss the DEMONSTRATOR$^{'}$s energy calibration process, with a focus on the energy determination methods.
*This material is 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.
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