| Distinctive ssion signals, utilizing bremsstrahlung photons to induce ssion, have been rigorously studied with beam energies below 20 MeV. These signals incorporated delayed γ-rays and delayed neutrons that were identi ed by their energy and temporal characteristics. Requirements to enhance the detectable signal for stand-o detection motivated an increase in the bremsstrahlung beam energy. Utilizing the techniques developed at lower bremsstrahlung energies to construct ssion signals, this research studies the reliability of ssion signals and the impact of interferences in higher bremsstrahlung endpoint energy environments. The bremsstrahlung endpoint energies were increased from 15 to 45 MeV with 13 ssionable and 32 non- ssionable targets irradiated. At 15 MeV the ssionable signals were clearly discriminated, consistent with prior research. However, as the beam energy increased interferences from non- ssionable materials became evident. By 37.5 MeV, all non- ssionable targets interfered with the ssion signals compromising ssion signal reliability. In addition, the limited availability of production cross sections led to an examination of bremsstrahlung integral yields. Utilizing discrete γ-rays resulting from the decay products of interfering reactions, 7 measured integral yields were compared to the simulated bremsstrahlung integral yields. These comparisons provided information on the accuracy of a simulated signal in relation to a measured signal. |