Abstract
Measurements of fission product yields play an important role for the understanding of fundamental aspects of the fission process. Recently, neutron-induced fission product-yield data of $^{239}\mathrm{Pu}$ at energies below 4 MeV revealed an unexpected energy dependence of certain fission fragments. In order to investigate whether this observation is prerogative to neutron-induced fission, a program has been initiated to measure fission product yields in photoinduced fission. Here we report on the first ever photofission product yield measurement with monoenergetic photons produced by Compton back-scattering of FEL photons. The experiment was performed at the High-Intensity Gamma-ray Source at Triangle Universities Nuclear Laboratory on $^{239}\mathrm{Pu}$ at ${E}_{\ensuremath{\gamma}}=11$ MeV. In this exploratory study the yield of eight fission products ranging from $^{91}\mathrm{Sr}$ to $^{143}\mathrm{Ce}$ has been obtained.
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