CODE | NUCLIDE | ORIGINAL DATA TAKEN FROM | MODIFICATION | ADDITIONAL FILE MODIFICATIONS | ORIGINAL DATA TAKEN FROM | MODIFICATION | ADDITIONAL FILE MODIFICATIONS | COMMENTS |
1014028 | 014_Si_028 | ENDF/B-VI MOD 3 | Evaluation, Dec 1999, M.B. Chadwick and P.G. Young, LANL Changes only > 20 MeV. This revision involved solely replacing MF6 MT5 yields and spectra with new values, based on a new GNASH analysis (Bateman et al.,Phys Rev.C60,064604,1999) which was optimized to fit Bateman and Haight (n,xalpha) and (n,xp) for n+28Si measured at LANSCE/WNR. The main difference compared to the previous evaluation is better alpha production data. |
COVARIANCES, July, 2011, S. Hoblit, BNL New BNL estimates in the resonances region were obtained with the kernel approach. We note that resonance region for Si extends to fairly high energies, in particular for 28-Si up to 2.7 MeV. Included in our evaluation were resonance parameter uncertainties taken over from Atlas of Neutron Resonances. Dominant contribution to elastic scattering uncertainties comes from the uncertainty of the scattering radius R'. Covariances in the resonance region were merged with the covariances in the fast neutron region taken from the ENDF/B-VI.8. We reviewed the latter data and concluded that they are reasonable with the exception of MT=104 covariances which were considered to be problematic and hence they have been removed. |