Fission product yields from the 238U(n, f ) reaction at En=4.6 MeV

We present cumulative fission product yields from the 238U(n, f ) reaction at an incident energy of 4.6 MeV for fission products with half-lives from less than one second to several hours. We employed direct gamma-ray spectroscopy to measure unseparated fission products with a conventional neutron activation analysis and a cyclic activation technique using the RApid Belt-driven Irradiated Target Transfer System (RABITTS). Yields were determined for 78 isotopes and isomers, covering the mass range 84 A 148 and the charge range from 33(As) Z 58(Ce). Our experimental cumulative yields are compared to the literature and evaluated data at En approximate to 0.5 MeV from ENDF/B-VIII.0 and JEFF-3.3 libraries and with theoretical models using the GEF and FREYA codes at En = 4.6 MeV.