VITJEFF31.BOLIB - A JEFF-3.1 Multi-Group Coupled (199 n + 42γ) Cross Section Library in AMPX Format for Nuclear Fission Applications

The ENEA-Bologna Nuclear Data Group produced the VITJEFF31.BOLIB multi-group coupled (199 n + 42 y) cross section library in AMPX format, based on the JEFF-3.l OECD/NEA Data Bank nuclear data library. The generation of VITJEFF31.BOLIB for nuclear fission applications was conceived as an European counterpart of the ENDF/B-VI Release 3 VITAMlN-B6 American library. The present library has the same group structure and generaI features as VITAMIN-B6 and was produced using similar data processing methodologies, based on the NJOY-99.160 system with an ENEA-Bologna modified version of the GROUPR module and the ENEA-Bologoa 2007 Revision of the SCAMPI system. VITJEFF3l.BOLIB is a pseudo-problem-independent library based on the Bondarenko (f-factor) method far the treatment of neutron resonance self-shielding and temperature effects. The library contains 176 nuclides processed at 4 temperatures (300 °K, 600 °K, 1000 °K and 2100 °K), obtained far the most part with 6 to 8 values far the background cross section. Thermal scattering cross sections were processed at all the temperatures available in the JEFF-3.1 thermal scattering law data file far 6 additional bound nuclides (H-1 in light water, H-1 in polyethylene, H-1 in zirconium hydride, H-2 in heavy water, C in graphite and Be in beryllium metal). From VITJEFF31.BOLIB it is possible to generate, through the ENEA-Bologna 2007 Revision of SCAMPI, collapsed working libraries of self-shielded cross sections in AMPX or FIDO-ANISN format.