$$\overline{TKE}$$ Parameterization and $$\bar{v}$$ Uncertainty Analysis for CGMF
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Previous work was performed on tuning CGMF parameters for 235U, 238U, and Plutonium isotopes. Now work is being done to tune minor uranium isotopes. However, uranium isotopes like 232U and 236U have almost no experimental data. We are applying cross-isotope models to extrapolate and tune CGMF on isotopes that lack experimental data. There exist several internal CGMF physics quantities that affect the output of CGMF—multi-chance fission probability, excitation energy sharing, spin-cutoff factor, spin scaling, and fragment total kinetic energy to name a few. The mean fragment total kinetic energy, $$\overline{TKE}$$, is particularly interesting because of its strong anti-correlation with $$\bar{v}$$. We are most interested in the mean fragment total kinetic energy before neutron emissions. $$\overline{TKE}$$ is assumed to be pre-neutron emission unless otherwise stated. Currently in CGMF, the $$\overline{TKE}$$ model for 233,234,235,238U are tuned independently to reproduce ν for the associated isotopes. In this report, we will tune a cross-isotope $$\overline{TKE}$$ model to experimental $$\overline{TKE}$$ data for 232,233,234,235,236,238U. Because of the unreliable and sparse nature of $$\overline{TKE}$$ experimental data, future work will use more reliable experimental $$\bar{v}$$ data to infer the $$\overline{TKE}$$ model (and likely other internal CGMF parameters) for uranium isotopes. Such work has been performed previously using a sensitivity analysis and Kalman filter methods.
- Research Organization:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- USDOE National Nuclear Security Administration (NNSA), Nuclear Criticality Safety Program (NCSP)
- DOE Contract Number:
- 89233218CNA000001
- OSTI ID:
- 2438484
- Report Number(s):
- LA-UR--24-29315
- Country of Publication:
- United States
- Language:
- English
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