Abstract
Cumulative fast fission product yields for 235 U and 238 U were measured at Godiva-IV in burst mode. Data was collected starting 45 minutes after the prompt irradiation. Data analysis codes were developed to analyze gammarays and calculate fission product yields with their respective uncertainties. Due to uncertainties in the branching ratios, different γ-rays from the same isotope led to different fission yield. This led to an effort at Oregon State University (OSU) to utilize the Rabbit facility at their 1 MegaWatt Training, Research, Isotopes, General Atomics (TRIGA) nuclear research reactor. The new experimental setup will allow us to measure branching ratio data and short-lived fission product yields starting seconds after a prompt irradiation.
Highlights
Fission product yields are used in the prediction of the behavior and performance of engineered systems involving nuclear fission
Measurements of fission product yields have been traditionally performed through radiochemistry, mass spectrometry, and γ-ray spectroscopy, often with mono-energetic neutrons
The Godiva-IV critical assembly was employed to perform a burst irradiation of a sample of 235U and 238U with the goal of measuring fission yields within an hour of prompt irradiation of neutrons in the Watt fission spectrum
Summary
Fission product yields are used in the prediction of the behavior and performance of engineered systems involving nuclear fission. Measurements of fission product yields have been traditionally performed through radiochemistry, mass spectrometry, and γ-ray spectroscopy, often with mono-energetic neutrons. The Godiva-IV critical assembly was employed to perform a burst irradiation of a sample of 235U and 238U with the goal of measuring fission yields within an hour of prompt irradiation of neutrons in the Watt fission spectrum. An experiment at OSU will measure fission yields seconds after a prompt irradiation. We have developed a γ spectroscopy-based data analysis procedure that has been developed for the prediction of fission yields that is independent of the actinide sample for the Godiva-IV experiment and will be used for the OSU experiment
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