The neutron interaction cross sections in the energy range below 20 MeV for 232Th have been completely revised starting from both recent experimental data and theoretical results given by an updated version of the CIRCE, POLIFEMO and PENELOPE chain codes for direct reaction, compound nucleus and direct scattering calculations. The angular distributions for inelastic scattering by the first three excited levels, taking into account the nuclear deformation up to the hexadecapole term, have been calculated and compared with experimental results. The new data set has been tested in calculiations performed on the THOR fast criticality experiment. The transport calculations were carried out in spherical geometry through the XSDRNPM transport module of the SCAMPI Data Processing System. The results were compared with the corresponding ones obtained with other 232Th data files (ENDFB VI-3, JEF-2.2 and JENDL-3.2).
A Neutron Cross Section Evaluation for Th-232 in the En &l 20 MeV Energy Range
Pescarini, M.;Rocchi, F.;Fabbri, F.;
2001-10-07
Abstract
The neutron interaction cross sections in the energy range below 20 MeV for 232Th have been completely revised starting from both recent experimental data and theoretical results given by an updated version of the CIRCE, POLIFEMO and PENELOPE chain codes for direct reaction, compound nucleus and direct scattering calculations. The angular distributions for inelastic scattering by the first three excited levels, taking into account the nuclear deformation up to the hexadecapole term, have been calculated and compared with experimental results. The new data set has been tested in calculiations performed on the THOR fast criticality experiment. The transport calculations were carried out in spherical geometry through the XSDRNPM transport module of the SCAMPI Data Processing System. The results were compared with the corresponding ones obtained with other 232Th data files (ENDFB VI-3, JEF-2.2 and JENDL-3.2).I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
