CODE | NUCLIDE | ORIGINAL DATA TAKEN FROM | MODIFICATION | ADDITIONAL FILE MODIFICATIONS | ORIGINAL DATA TAKEN FROM | MODIFICATION | ADDITIONAL FILE MODIFICATIONS | COMMENTS |
1093237 | 093_Np_237 | ENDF/B-VI.8 | Covariances - BNL, July, 2011: Covariances were adopted from COMMARA-2.0, which were contributed by BNL. S. Mughabghab produced revisited low-fidelity estimates at low energies. In the fast neutron region cross section covariances were obtained using EMPIRE/KALMAN approach (M. Pigni, BNL), with prior parameterization produced by Mihaela Sin (Bucharest). Three nuclear reaction models were adopted: (i) coupled-channels optical model (RIPL catalog number 2408), (ii) Hauser-Feshbach statistical model, and (iii) exciton pre-equilibrium model. Optical model allowed us to determine total and absorption cross sections, neutron direct elastic and inelastic scattering, as well as the transmission coefficients needed to calculate the compound-nucleus cross sections. Coupled-channels (CC) calculations were performed using five collective levels and three deformation parameters. For Hauser-Feshbach part of calculations adopted were EMPIRE-specific level densities. The treatment of the fission channel was carried out within the formalism developed by M. Sin. We varied inner and outer barrier heights and widths for the fissioning nuclei. MATP SEt to zero in MF8/MT16 at NNDC |