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Prompt fission $\gamma$-rays are responsible for approximately 5\% of thetotal energy released in fission, and therefore important to understand whenmodelling nuclear reactors. In this work we present prompt $\gamma$-rayemission characteristics in fission, for the first time as a function of thenuclear excitation energy of the fissioning system. Emitted $\gamma$-rayspectra were measured, and $\gamma$-ray multiplicities and average and total$\gamma$ energies per fission were determined for the $^{233}$U(d,pf) reactionfor excitation energies between 4.8 and 10 MeV, and for the $^{239}$Pu(d,pf)reaction between 4.5 and 9 MeV. The spectral characteristics show nosignificant change as a function of excitation energy above the fissionbarrier, despite the fact that an extra $\sim$5 MeV of energy is potentiallyavailable in the excited fragments for $\gamma$-decay. The measured results arecompared to model calculations made for prompt $\gamma$-ray emission with thefission model code GEF. Further comparison with previously obtained resultsfrom thermal neutron induced fission is made to characterize possibledifferences arising from using the surrogate (d,p) reaction.

Energy dependence of the prompt ${\gamma}$-ray emission from the $(d,p)$-induced fission of $^{234}\mathrm{U}^{*}$ and $^{240}\mathrm{Pu}^{*}$

Energy dependence of the prompt ${\gamma}$-ray emission from the $(d,p)$-induced fission of $^{234}\mathrm{U}^{}$ and $^{240}\mathrm{Pu}^{}$