Low-Fidelity Covariances
 Neutron Cross Section Covariance Estimates for 387 Materials
Warning: Not approved by CSEWG, not part of ENDF/B-VII.0
    

Click on the element, then on isotope (material) to get plots of uncertainties and correlation matrices. Numerical values can be retrieved using the link above the plots.
1
H
2
He
  Results for
Z = 7

3
Li
4
Be
5
B
6
C
7
N
8
O
9
F
10
Ne
 
11
Na
12
Mg
13
Al
14
Si
15
P
16
S
17
Cl
18
Ar
 
19
K
20
Ca
21
Sc
22
Ti
23
V
24
Cr
25
Mn
26
Fe
27
Co
28
Ni
29
Cu
30
Zn
31
Ga
32
Ge
33
As
34
Se
35
Br
36
Kr
 
37
Rb
38
Sr
39
Y
40
Zr
41
Nb
42
Mo
43
Tc
44
Ru
45
Rh
46
Pd
47
Ag
48
Cd
49
In
50
Sn
51
Sb
52
Te
53
I
54
Xe
 
55
Cs
56
Ba
57
La
72
Hf
73
Ta
74
W
75
Re
76
Os
77
Ir
78
Pt
79
Au
80
Hg
81
Tl
82
Pb
83
Bi
84
Po
85
At
86
Rn
 
87
Fr
88
Ra
89
Ac
104
Rf
105
Db
106
Sg
107
Bh
108
Hs
109
Mt
110
Ds
111
Rg
112
Cn
113
Uut
114
Uuq
115
Uup
116
Uuh
117
Uus
118
Uuo
 
58
Ce
59
Pr
60
Nd
61
Pm
62
Sm
63
Eu
64
Gd
65
Tb
66
Dy
67
Ho
68
Er
69
Tm
70
Yb
71
Lu
 
90
Th
91
Pa
92
U
93
Np
94
Pu
95
Am
96
Cm
97
Bk
98
Cf
99
Es
100
Fm
101
Md
102
No
103
Lr
 
Contents
Covariance data are provided for radiative capture (or (n,ch.p.) for light nuclei), elastic scattering (or total for some actinides), inelastic scattering, (n,2n) reactions, fission and nubars over the energy range from 10-5 eV to 20 MeV. The library contains 387 files including almost all (383 out of 393) materials of the ENDF/B-VII.0. Absent are data for 7Li, 232Th, 233,235,238U and 239Pu as well as 223,224,225,226Ra, while natZn is replaced by 64,66,67,68,70Zn.

Reference
R.C. Little et al., "Low-Fidelity Covariance Project", Nuclear Data Sheets 109 (2008) 2828-2833; for those without full access to NDS we offer draft version of the paper.

Retrieval and plotting
The Sigma retrieval and plotting package developed by the NNDC is used to retrieve and plot uncertainties and correlation matrices. No processing is performed, Sigma directly plots MF33 data (cross section covariances) and MF31 data (nubar covariances). In some cases processing using cross sections (MF3) is required to get covariances and plots could not be produced.

Acknowledgement
Low-Fidelity Covariance Project, conducted by ANL-BNL-LANL-ORNL cpllaboration in FY2007-FY2008, was sponsored by the US Nuclear Criticality Safety program managed by DOE-NNSA.

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Responsible: Pavel Oblozinsky, NNDC, Brookhaven National Laboratory
Last Modified: February 27, 2009