$^{56}Co$ studies for LEGEND-200

Pulse shape discrimination (PSD) is a powerful tool to discriminate against background in the region of interest around $Q_{\beta\beta}$ in LEGEND-200. $^{56}Co$ can be used to calculate the signal acceptance at $Q_{\beta\beta}, as the isotope has several $\gamma$-lines with energy > 3 MeV. The corresponding double escape peaks serve as a good proxy for single-site (signal-like) events and can be used to study the energy dependence of the signal acceptance of the PSD parameters. However, the high data rates overall from the source activity, coupled with the low count rates in the peaks of interest make this a challenging dataset to acquire and analyze. An initial dataset was acquired for an inverted coaxial point contact detector on the Full Chain Test (FCT) stand at the University of North Carolina, to plan for the official run and analysis. Subsequently, a dedicated calibration run was planned and performed in LEGEND-200. In this talk, we will discuss briefly the $^{56}Co$ run and the subsequent analysis.