Covariance Data Processing and Plots
Covariance data in ENDF/B-VI.8 (47 materials), ENDF/B-VII.0 (26 materials), JEFF-3.1 (37 materials) and JENDL-3.3 (20 materials) were processed
using ERRORJ-2.3 (patched version) which is currently being reintegrated into NJOY. Processing was performed on NNDC's Linux Cluster using the 44- and 187-group energy
structures and the constant-flux weighting function. The table below presents the plots (in Acrobat format) generated under
each library. Please note that a shaded cell in the table indicates that the material in the pertinent library does not
contain covariance data.
* Material could not be successfully processed. |
** The 187-group energy structure is too detailed for this material. |
Uncertainties of Thermal Neutron Capture Cross Sections
Source: S.F. Mughabghab, Atlas of Neutron Resonances. Amsterdam: Elsevier, 2006.
No. | Material | Relative Uncertainty(%) | Comment |
1 | Li-6 | 7.79 | Maxwellian spectrum |
2 | Li-7 | 5.94 | Maxwellian spectrum |
3 | B-10 | 5.25 | Maxwellian spectrum |
4 | F-19 | 0.95 | Maxwellian spectrum |
5 | Na-23 | 0.77 | |
6 | Ti-48 | 1.92 | Maxwellian spectrum |
7 | V-nat | 0.79 | |
8 | Co-59 | 0.16 | |
9 | Ni-58 | 2.29 | Maxwellian spectrum |
10 | Y-89 | 1.56 | |
11 | Nb-93 | 4.35 | |
12 | Tc-99 | 5.70 | |
13 | Gd-152 | 2.72 | Maxwellian spectrum |
14 | Gd-153 | 13.45 | Corrected uncertainty* |
15 | Gd-154 | 14.12 | |
16 | Gd-155 | 0.82 | |
17 | Gd-156 | 38.89 | |
18 | Gd-157 | 0.32 | |
19 | Gd-158 | 9.09 | |
20 | Gd-160 | 21.43 | Maxwellian spectrum |
21 | Ir-191 | 1.05 | |
22 | Ir-193 | 4.50 | |
23 | Au-197 | 0.09 | |
24 | Bi-209 | 2.05 | |
25 | Th-232 | 0.41 | |
26 | U-235 | 0.81 | |
* Typo in Atlas: Correct absolute uncertainty is + 3000 b rather than + 300 b. |
Web: Ramon Arcilla, NNDC, Brookhaven National Laboratory
Last Modified: September 27, 2007
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