Abstract
The photo-nuclear physics model capabilities utilising the CEM2k model implemented in the MCNPX code were improved >100 MeV photon energy by basing the photon transport on experimental photo-absorption cross sections of nuclides rather than on free nucleon cross sections. Below 100 MeV, the photo-nuclear physics model now uses isotope-specific giant dipole resonance (GDR) photo-absorption cross sections that are provided to the code in a parameterised form on a data file. Adjustments of the photo-fission cross sections were implemented to match the BOFOD evaluated data through a CEM2k internal parameter. The physics models with these improvements are better equipped to supplement the tabulated data based photo-nuclear MCNPX capability for isotopes with missing tabulated data evaluations especially in the GDR region, and has improved its predictive power at energies above the GDR resonances.
| Original language | English |
|---|---|
| Pages (from-to) | 264-269 |
| Number of pages | 6 |
| Journal | Radiation Protection Dosimetry |
| Volume | 116 |
| Issue number | 1-4 |
| DOIs | |
| State | Published - Dec 20 2005 |
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