MCNP 6 Fission Cross Section Calculations at Intermediate and High Energies

MCNP6 has been Validated and Verified (V&V) against intermediateand high-energy fission-cross-section experimental data. A previously unobserved error in the calculation of fission cross sections of Ta and other nearby target nuclei by the CEM03.03 event generator in MCNP6 and a technical “bug” in the calculation of fission cross sections with the GENXS option of MCNP6 while using the LAQGSM03.03 event generator were detected during our current V&V work. After fixing both these problems, we find that MCNP6 using the CEM03.03 and LAQGSM03.03 event generators calculates fission cross sections in a good agreement with available experimental data for reactions induced by nucleons, pions, and photons on both subactinide and actinide nuclei (from Ho to Pu) at incident energies from several tens of MeV to about 1 TeV.

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