CODE	NUCLIDE	ORIGINAL DATA TAKEN FROM	MODIFICATION	ADDITIONAL FILE MODIFICATIONS	ORIGINAL DATA TAKEN FROM	MODIFICATION	ADDITIONAL FILE MODIFICATIONS	COMMENTS
1004009	004_Be_009	ENDF/B-VII	January 2006, G.Hale, P.G.Young (LANL) A simplified revision of the 9Be file has been made for the first release of ENDF/B-VII based on a single-channel R-matrix analysis of the n+9Be total cross section. This analysis fits the total cross section data of refs [1-5] quite well at energies up to 5 MeV. However, since it is single-channel, the analysis does not give the partitioning of the total cross section into its constituent parts [(n,n), (n,2n),...] above the lowest (n,2n) threshold. Therefore, the reaction cross sections were unchanged, and the elastic cross section (MT=2) was obtained by subtracting the total nonelastic cross section from the revised total cross section at energies below 5 MeV. Nothing above that energy was changed. The elastic scattering angular distributions (MF=4,MT=2) were also kept the same at all energies. The reason for this simple modification is that integral experiments with Be reflectors indicated that the elastic cross section should be reduced at low energies. The new fit to the total cross section gave this behavior, especially at energies in the minimum before the first resonance at 625 keV. Preliminary testing has verified that these changes improve the performance of the 9Be cross sections in reflected integral experiments somewhat, but that additional future improvements would be desirable.	April 2011, G.Hale (LANL) The capture cross section was updated. The total and non-elastic cross sections were adjusted by the difference in the new/old capture cross sections. Covariance Matrices added, April 2011, S.Hoblit (BNL) Covariance Matrices (MF33) were added from AFCI-2.0 covariance data library. These covariances were estimated at LANL based on a brief analysis of experimental data and their agreement with the ENDF/B-VII.0 central values.	ENDF/B-VI MOD 2	Revision, June 2000, S.C.Frankle, R.C.Reedy, P.G.Young (LANL) The secondary gamma-ray spectrum for radiative capture (MT 102) has been modified for incident neutron energies up to 20 MeV, based on new thermal neutron data. The Q-value for radiative capt. was also updated in File 3. Details of these changes are described in Frankle et al. [Fr2001]. Additionally, the 9Be(n,t1) cross section was modified to agree with the gamma-ray experimental data of Nelson and Michaudon [Ne1999].