$^{239}$Pu Cumulative Fast Fission Product Yield Analysis*

Precise integral measurement of fast neutron-induced fission product yields for various actinides is of high interest for applied nuclear science. The goal of this effort is to improve uncertainties in fission product yield values of $^{239}$Pu. Fission was induced in a pure $^{239}$Pu ($>99\%$) target using the Godiva-IV critical assembly in burst mode. The irradiated sample was transferred to a high-resolution $\gamma$-ray detector within 45 minutes. $\gamma$-ray list mode data was collected from 45 minutes to 1 week after the irradiation. $\gamma$-ray spectroscopy was performed to analyze the time dependent $\gamma$-ray yields using an automated peak search algorithm to identify isotopes by their decay $\gamma$-ray energy and half-life. The initial activity for each isotope identified was used to calculate their fission product yield.