Energy Dependent Fission Product Yields

Fission product yields (FPY) are essential ingredients for addressing questions relevant to a range of basic and applied physics. Examples include the cosmic nucleosynthesis processes that created the elements from iron to uranium, reactor antineutrino studies, development of advanced reactor and transmutation systems, and many national security applications. The goal of this study is to provide high-precision and energy dependent FPY data using monoenergetic neutron beams with energies between 0.5 and 15 MeV. An overview of the recent experimental results obtained by the LLNL-LANL-TUNL collaboration will be presented. The energy dependent FPY results will be discussed in terms of (i) contributions from different chances of fission, (ii) variation of independent mass yields with incident neutron energy due to contributions of different fission modes, (iii) washing out of even-odd effects in charge distribution of fission fragment yields with increase of the neutron energy, and (iv) fragment mass yields distributions after emission of prompt neutrons.