| Nuclide |
From |
Date |
Comment |
Status |
| 8-O-16 |
C. Nordborg |
26.01.94 |
(n,alpha) reaction MT=107, 800’s :At one of the first
energies these reactions have cross sections of 10e-38 which may
cause problems on short word machines. |
|
| 13-Al-27 |
C. Dean |
22.10.94 |
MT=102 SIGMA is recorded as having been changed from
232 mb to 213mb(upon recommendation from Bologna?). However, c.f.
with Mughabgabab which quotes 231+-3 and this change looks suspicious. |
|
| 6-O-16 |
C. Dean |
6.10.94 |
Atomic Weights on the 1994 WIMS library.
The atomic mass values on the 1994 WIMS library are listed in
Table 10 of AEA-RS 5690. They are taken from the relevant JEF2.2
evaluation. These are given relative to a neutron. The NJOY code
converts them to the C12 scale by multiplying by the neutron mass.
Values on JEF2.2 are often dated because "current" values were
included when the evaluation was FIRST produced. Many parts of
JEF and ENDF libraries are converted from older issues without
updating the mass values. Values from the latest mass evaluations
should be included in later WIMS libraries.
6/10/94 Mike Halsall noted Table 10 contained a value of 15.9905
for O16. He expected a value of ~15.995. The JEF2.2 evaluation
is taken from ENDF/B-VI. Both contain a mass of 15.85316 relative
to a neutron giving 15.9905 on the C12 scale. JENDL3 contains
15.8575 and JEF1.1 15.858. ENDF/B-VI hydrogen in H2O contains
an oxygen mass of 15.858.
Checks against the latest mass evaluation indicate the JEF2.2/ENDFB-VI
evaluations may be wrong!
Currently JEF and ENDF/B-VI will not be changed - neither will
the WIMS 1994 library. However the US evaluators should be asked
to examine the value.
|
|
| 38-Sr-90 |
M. Sowerby |
6.2.95 |
Problem in Sr-90 capture cross section - thermal
capture is x60 to high in JEF-2.2 |
|
| Many |
P. Ribon |
|
All energy points in the partial sections should
be present in the total sections. Examples: 174Hf, 176Hf, 235U. |
|
4-Be-9
5-B-10
7-N-14
8-O-16 |
G.C.Panini |
|
Missing angular distributions for the following light
isotopes:
9Be (MT=700-701), 10B (600-603, 800-801), 14N (600-604, 650-653,
700-701, 800-810), 16O (800-803). |
|
5-B-11
9-F-19
11-Na-23
19-K-nat
74-W-182
74-W-183
74-W-184
74-W-186
83-Bi-209
|
G.C.Panini |
|
Kerma calculation problems for some isotopes |
|
| Many |
C. Dean |
|
Checking of the unresolved resonance parameters needed.
Processing problems, especially with parameters taken from KEDAK
formatted evaluations, have been encountered. |
|
| 25-Mn-55 |
P. Ribon |
|
Modification of the capture resonance region background
cross section needed. |
|
| 42-Mo-100 |
C. Gragg |
|
(n,2n) - tabulated subsection must be last. |
|
| 50-Sn-122 |
T. Nakagawa |
|
Upper limit of the resolved resonance region should
be 8.603905+3 eV. |
|
| 63-Eu-154 |
T. Nakagawa
C. Gragg |
|
Contains artificial resonance parameters from ENDF/B-V |
|
| 63-Eu-155 |
T. Nakagawa
C. Gragg |
|
Needs updating |
|
| 68-Er-166 |
C. Gragg |
|
Resonance integral and 2200 m/s values much larger
than ENDF/B-VI |
|
| 92-U-233 |
H. Tellier |
|
Needs updating |
|
| 92-U-235 |
P. Ribon |
|
There are two resonances with the same energy and
same spin at 2.2 keV |
|
| 92-U-235 |
C. Dean |
|
Verify the consistency between the JEF-2.2 and ENDF/B-VI
rev. 1 evaluations |
|
| 94-Pu-239 |
P. Ribon and E. Dupont |
|
neutron widths for L=1, J=1 unresolved resonance
parameters should be divided by 2, following an earlier correction
to the value of parameter AMUN and upper limit unresolved resonance range to 30 keV JEF22N9437_CEA.ASC |
corrected evaluation available |
| 94-Pu-239 |
H. Derrien |
|
New resonance parameters up to 2 keV from H. Derrien
available |
|
| 95-Am-241 |
J.L.Rowlands |
25.08.95 |
Resonance widths, for capture and fission need x7/6
adjustment. Resonance width for neutron needs x2 adjustment |
|
| 82-Pb-nat |
A. Hogenbirk |
08.04.97 |
Format problem; for threshold energies in the MF6
data the distribution is not normalised.
It occurs for MT numbers for which MF6 data are given (not only
MT16 and MT91) |
|
| 94-Pu-239 |
M. Mattes |
21.02.96 |
Redundancy in fission spectra (MF=5) leads to processing
problems with NJOY.
JEF-2.2 evaluation contains both MT=18 and also the partials
- MT=19,20,21 and 38.
|
|
| 92-U-235 |
P. Ribon |
13.05.97 |
Resolved resonance region: J=4 – two resonances with
the same energy (744.2 eV) |
|
| 92-U-235 |
P. Ribon |
13.05.97 |
Resolved resonance region: 300-500 eV: 6 pairs of
resonances with spacings of <0.04eV, i.e. statistically impossible. |
|
| 48-Cd-nat |
P. Ribon |
13.05.97 |
Pointwise cross sections: the resonance at 58.7eV
is a phantom (i.e. does not exist in JENDL and has not been observed
in GEEL experiments). |
|
| 45-Rh-103 |
P. Ribon |
13.05.97 |
Spin of resonance at 154eV is J=0. This gives a poor
fit to with predictions from GEEL, and Older experiments. |
|
| 68-Er-166 |
P. Ribon |
13.05.97 |
Resolved resonance region: missing resonance at 170
eV |
|
| 68-Er-166 |
P. Ribon |
13.05.97 |
Pointwise cross section: interpolation of a background
capture cross section between 0.025eV (33.3b) and 2000eV (0.118b)
this is an absurd interpolation |
|
| 45-Rh-105 |
P. Ribon |
13.05.97 |
Pointwise cross section: lack of data between 0.5
and 2.0 eV |
|
| 26-Fe-56 |
P. Ribon |
13.05.97 |
Pointwise cross section: inelastic cross section
too low between 1.5 and 4.5 MeV |
|
11-Na-22,
18-Ar-36,
18-Ar-38,
18-Ar-40,
27-Co-58m,
27-Co-58,
28-Ni-59,
30-Zn-64,
and
50-Sn-112 |
Waclaw Gudowski via NJOY list server via C. Dean |
05.06.2000 |
Evaluations are not complete. They include cross
sections and angular distributions for (n,n'p) and (n,n'alpha),
but the corresponding File 5 secondary energy distributions are
missing. This makes it impossible to run HEATR, GROUPR matrices,
or ACER "c" files, and it is impossible to do neutron transport
calculations. The ENDF format requires that both MF4 and MF5 be
present for reactions in the range MT=16-50.
However, the cross sections can be used for dosimetry or activation
purposes. |
|