Table 1
Description of the 20 groups energy mesh.
| Group | Energy upper bound | Comments |
|---|---|---|
| 1 | 19.64 MeV | (n,2n) and 2nd chance fission |
| 2 | 4.490 MeV | Fast domain |
| 3 | 2.231 MeV | First resonance of 16O |
| 4 | 1.337 MeV | |
| 5 | 494 eV | |
| 6 | 195 keV | |
| 7 | 67.38 keV | |
| 8 | 25 keV | |
| 9 | 9.12 keV | Unresolved domain |
| 10 | 1.91 keV | |
| 11 | 411 eV | Resolved resonances |
| 12 | 52.67 eV | 3 first resonances of 238U |
| 13 | 4.000 eV | 240Pu & 242Pu resonances |
| 14 | 625 MeV | |
| 15 | 353 MeV | Resonances of 239Pu |
| 16 | 231.2 MeV | |
| 17 | 138 MeV | |
| 18 | 76.5 MeV | Purely thermal domain |
| 19 | 34.4 MeV | |
| 20 | 10.4 MeV |
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