Abstract
The nuclear data team at Los Alamos National Laboratory has undertaken a campaign to construct new fission yield evaluation. Significant advances have been made on a number of fronts. Nuclear potential energy surfaces can now be generated with the newly developed MicMac code based off the Finite Range Liquid-Drop Model (FRLDM). This model can be incorporated into the Los Alamos de-excitation framework codes BeOH and CGMF to perform modeling of prompt, independent (IFY) and cumulative (CFY) fission yields that take into account prompt and beta-delayed neutrons and photons consistent with decay data. This is in stark contrast to what exists in evaluated nuclear data libraries today, where only a few incident energy points are used with limited physical insights and no consistency between IFY, CFY and decay data. We highlight the latest progress with application of neutron-induced fission of 235 U and 239 Pu.
Highlights
The understanding of fission, or splitting of a heavy nucleus into smaller fragments, is critical for applications of energy production, national security, and fundamental science [1, 2]
Our novel evaluation effort seeks to combine these recent advances, focusing on the description of Fission Product Yield (FPY), to independent (IFY) and cumulative (CFY) fission yields that take into account prompt and delayed emission consistent with decay data [11, 12]
The current Los Alamos fission evaluation effort depends upon the construction of a stateof-the-art platform where many separate codes are combined together under one centralized Python3 framework, NEXUS
Summary
The understanding of fission, or splitting of a heavy nucleus into smaller fragments, is critical for applications of energy production, national security, and fundamental science [1, 2]. Los Alamos National Laboratory and partner institutions are currently undertaking a new Fission Product Yield (FPY) evaluation effort for use in such applications. The last major update to the US ENDF FPY evaluation came from the work of Chadwick et al [3], nearly a decade ago. Since this time, remarkable advancement has been made in theoretical modeling of fission [4,5,6,7] and measurements campaigns have produced modern data over a range of excitation energies, see e.g. We outline a typical workflow of the fission evaluation and report on the progress of theoretical modeling efforts
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