VITJEFF311.BOLIB - A JEFF-3.1.1 Multi-Group Coupled (199 n + 42 γ) Cross Section Library in AMPX Format for Nuclear Fission Applications

The ENEA-Bologna Nuclear Data Group produced the VITJEFF311.BOLIB multi-group coupled (199 n + 42 ) cross section library in AMPX format, based on the JEFF-3.1.1 OECD-NEA Data Bank evaluated nuclear data library. The generation of the VITJEFF311.BOLIB library for nuclear fission applications was conceived as an European counterpart of the ENDF/B-VI Release 3 VITAMIN-B6 American library. The present library has the same neutron/photon energy group structures and general features as VITAMIN-B6 and was produced using similar data processing methodologies, based on the NJOY-99.259 and SCAMPI nuclear data processing systems. VITJEFF311.BOLIB is a pseudo-problem-independent library based on the Bondarenko (f-factor) method for 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 for the most part with 6 to 8 values for the background cross section. Thermal scattering cross sections were processed at all the temperatures available in the JEFF-3.1.1 thermal scattering law data file for 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 VITJEFF311.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, like the ENEA-Bologna BUGJEFF311.BOLIB library for LWR applications.