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Recent measurements of the reactor antineutrino emission show that thereexists a spectral excess (the "bump") in the 5-7 MeV region when compared tothe Huber-Muller prediction based on the conversion method. Analysis within analternate prediction technique, the summation method, suggests that the bumpcould be due to excess contributions from a certain few of the beta-decayingfission products. However, it has been shown that when updated fission yieldvalues are used in the summation method, the predicted excess vanishes. In thepresent preliminary study, fission yields for nuclides suspected of causing theneutrino spectral bump are investigated using gamma-ray spectroscopy of U-235and Pu-239 samples freshly irradiated using the High Flux Isotope Reactor. Forseveral of the suspect nuclides, the derived fission yields are consistent withJEFF3.3 fission yield library. The exception is the case of Cs-140 from Pu-239,where the discrepancy between the fitted and expected values suggests apotential error in the fission yield library. This highlights the importance ofusing accurate nuclear data libraries in the analysis of the reactorantineutrino spectra, and the need for ongoing efforts to improve theselibraries.

Reactor Antineutrino Spectral "Bump": Cumulative Fission Yields of Irradiated U-235 and Pu-239 Measured by HPGe Gamma-Ray Spectroscopy