Distribution of fission yields for fission spectrum neutron-induced fission of uranium-238

The mass-yield distribution for the neutron-induced fission of 238U by degraded fission spectrum neutrons with an average energy of 1.52 MeV has been measured radiochemically for 26 mass chains in the region A = 89 to 153. Germanium-lithium gamma-ray spectroscopy coupled with beta-particle counting techniques was used to determine the absolute activities of each nuclide measured. The absolute cumulative fission yield of mass chain 140 (140Ba--140La) was determined to be 6.07 +- 0.24 percent, and all other reported yields were measured relative to that value. Measured yields ranged from a maximum of 6.33 +- 0.55 percent for 103Ru on the light mass wing and 6.54 +- 0.28 percent for 133I on the heavy mass wing to a minimum of 0.030 +- 0.007 percent for 121Sn in the valley region. Results from this investigation provide a consistent set of cumulative mass yields from 238U fission induced by a well-characterized neutron spectrum