Extension of the Hauser-Feshbach Fission Fragment Decay Model to Multi-Chance Fission

Abstract

The Hauser-Feshbach fission fragment decay model, $\mathtt{H}{\mathtt{F}}^3\mathtt{D}$, which calculates the statistical decay of fission fragments, has been expanded to include multi-chance fission, up to neutron incident energies of 20 MeV. The deterministic decay takes as input pre-scission quantities - fission probabilities and the average energy causing fission - and post-scission quantities - yields in mass, charge, total kinetic energy, spin, and parity. From these fission fragment initial conditions, the full decay is followed through both prompt and delayed particle emissions, allowing for the calculation of prompt neutron and $\gamma$ properties, such as multiplicity and energy distributions, both independent and cumulative fission yields, and delayed neutron observables. In this work, we describe the implementation of multi-chance fission into the $\mathtt{H}{\mathtt{F}}^3\mathtt{D}$ model, and show an example of prompt and delayed quantities beyond first-chance fission, using the example of neutron-induced fission on ${}^{235}$U. This expansion represents significant progress in consistently modeling the emission of prompt and delayed particles from fissile systems.

15 pages, 11 figures, submitted to PRC

References in corpus (5)

• Total Prompt Energy Release in the Neutron-Induced Fission of 235-U, 238-U, and 239-Pu
• A 4-dimensional Langevin approach to low-energy nuclear fission of ${}^{236}$U
• Primary fission fragment mass yields across the chart of nuclides
• Nuclear Fission Dynamics: Past, Present, Needs, and Future
• Neutron-gamma competition for $\beta$-delayed neutron emission

Cited by in corpus (11)

• Theory of Nuclear Fission
• Nucleosynthesis and observation of the heaviest elements
• Neck Rupture and Scission Neutrons in Nuclear Fission
• Microscopic Calculation of Fission Product Yields for Odd-Mass Nuclei
• Influence of non-statistical properties in nuclear structure on emission of prompt fission neutrons
• Beta-delayed fission in the coupled Quasi-particle Random Phase Approximation plus Hauser-Feshbach approach
• Consideration of memory of spin and parity in the fissioning compound nucleus by applying the Hauser-Feshbach fission fragment decay model to photonuclear reactions
• Postfission properties of uranium isotopes: A hybrid method with Langevin dynamics and the Hauser-Feshbach statistical model
• Energy Dependent Calculations of Fission Product, Prompt, and Delayed Neutron Yields for Neutron Induced Fission on ${}^{235}$U, ${}^{238}$U, and ${}^{239}$Pu
• Neutron emission during fission and its impact on fission-fragment mass distribution studied by Langevin model
• Angular momentum removal by neutron and $\gamma$-ray emissions during fission fragment decays