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In this paper we present the first systematic analysis of the impact of thepopulated vs. intrinsic spin distribution on the nuclear level density and$\gamma$-ray strength function retrieved through the Oslo Method. We illustratethe effect of the spin distribution on the recently performed$^{239}\mathrm{Pu}$(d,p$\gamma$)$^{240}\mathrm{Pu}$ experiment using a 12 MeVdeuteron beam performed at the Oslo Cyclotron Lab. In the analysis we couplestate-of-the-art calculations for the populated spin-distributions with theMonte-Carlo nuclear decay code RAINIER to compare Oslo Method results to theknown input. We find that good knowledge of the populated spin distribution iscrucial and show that the populated distribution has a significant impact onthe extracted nuclear level density and $\gamma$-ray strength function for the$^{239}\mathrm{Pu}$(d,p$\gamma$)$^{240}\mathrm{Pu}$ case.

Impact of restricted spin-ranges in the Oslo Method: The example of (d,p)$^{240}\mathrm{Pu}$