Using CV curve to determine the impurity profile of HPGe detectors for LEGEND Experiment

The origin of asymmetry of matter and anti matter of our universe still remains a mystery. The question of if neutrino, a light, charge neutral spin ½ fundamental particle, is its own anti-particle could potentially be the key to solve this mystery. The Large Enriched Germanium Experiment for Neutrinoless ββ Decay (LEGEND) experiment uses high purity Germanium (HPGe) detectors to search for neutrinoless double beta decay (0νββ) , the most sensitive probe of the particle-antiparticle nature of neutrinos. The performance of these HPGe detectors will play a crucial role in signal detection. The impurity distribution of the HPGe detectors directly influences detector performance including electric-field maps, pulse-shape simulations, and dead-layer modeling, refining this analysis is essential for accurate detectors and an essential input for the main-line 0νββ decay analysis. We determined impurity distribution of the detectors by fitting the measured Capacitance-Voltage curve to the simulated data. The Julia-based SolidStateDetectors simulation provides power tools to simulate HPGe detectors behaviors.