Zirconium evaluations David Brown for H.I.Kim, S. Mughabghab M. Herman, A. Trkov, R. Capote, and R. Arcilla
Zirconium evaluationsDavid Brown
for H.I.Kim, S. Mughabghab
M. Herman, A. Trkov, R. Capote, and
R. Arcilla
H.I. Kim, S. Mughabghab and R. Capote re-evaluated Zr isotopes with EMPIRE, fitting ENDF/B-VI.8 (n,tot)
4Incident Energy (MeV)
Cro
ss S
ecti
on
(b
arn
s)
1 10
5
10
15
ENDF/B-VII.1 (BNL)ENDF/B-VI.8JENDL-4.0ENDF/B-VII.040-Zr-0(N,TOT),SIG
natZr(n,tot)
Strange (n,el) angular distributions changed leakage
6
Cross sections
Angle (deg)
dσ/dΩ
(b/s
r)
0 50 100 150
1
ENDF/B-VI.8 Ei3.50E+5JENDL-4 Ei3.50E+5BNL-final Ei3.50E+5
Figure 117: zr90[152]: Einc =0.35 MeV
Cross sections
Angle (deg)
dσ/dΩ
(b/s
r)
0 50 100 150
0.6
0.8
1.0
1.2 ENDF/B-VI.8 Ei1.50E+5JENDL-4 Ei1.50E+5BNL-final Ei1.50E+5
Figure 118: zr90[153]: Einc =0.15 MeV
Cross sections
Angle (deg)
dσ/dΩ
(b/s
r)
0 50 100 150
0.36
0.38
0.40
0.42
0.44
0.46 ENDF/B-VI.8 Ei1.50E+4JENDL-4 Ei1.50E+4BNL-final Ei1.50E+4
Figure 119: zr90[154]: Einc =15.0 keV
Cross sections
Angle (deg)
dσ/dΩ
(b/s
r)
0 50 100 150
0.41
0.42
0.43
0.44
0.45
0.46
0.47 ENDF/B-VI.8 Ei8.00E+0JENDL-4 Ei8.00E+0BNL-final Ei8.00E+0
Figure 120: zr90[155]: Einc =8.0 keV
33
Cross sections
Angle (deg)
dσ/dΩ
(b/s
r)
0 50 100 150
0.41
0.42
0.43
0.44
0.45
0.46
0.47ENDF/B-VI.8 Ei8.00E-1JENDL-4 Ei8.00E-1BNL-final Ei8.00E-1
Figure 121: zr90[156]: Einc =0.8 keV
Cross sections
Angle (deg)
dσ/dΩ
(b/s
r)
0 50 100 1500.41
0.42
0.43
0.44
0.45
0.46
0.47ENDF/B-VI.8 Ei8.00E-2JENDL-4 Ei8.00E-2BNL-final Ei8.00E-2
Figure 122: zr90[157]: Einc =80.0 eV
Cross sections
Angle (deg)
dσ/dΩ
(b/s
r)
0 50 100 150
0.42
0.43
0.44
0.45
0.46
0.47
0.48 ENDF/B-VI.8 Ei8.00E-3JENDL-4 Ei8.00E-3BNL-final Ei8.00E-3
Figure 123: zr90[158]: Einc =8.0 eV
Cross sections
Angle (deg)
dσ/dΩ
(b/s
r)
0 50 100 1500.48
0.50
0.52
0.54
0.56 ENDF/B-VI.8 Ei8.00E-4JENDL-4 Ei8.00E-4BNL-final Ei8.00E-4
Figure 124: zr90[159]: Einc =0.8 eV
34
E = 8 eV
E = 15 keV
Backward peaked at low energy?!?
Reported by C. Lubitz, T. Trumbull
Note: This keeps low energy neutrons from leaking out by scattering them back into the system, increasing keff
Given the short time-scale before ENDF/B-VII.1 due, we looked to other libraries
Since the double differential (n,el) cross section is
We can preserve the excellent (n,el) total cross section by replacing only the in file 4
JENDL-4 used Koning-Deleroche OMP, a reasonable substitute given that we are at a closed shell
FUDGE made this substitution simple
8
d�(E)
d⌦= (2⇡)�1�(E)P (E|µ)
You call it a Franken-evaluation, we say that it is a strong case for organ donation
9
Cross sections
Angle (deg)
dm/d1
(b/s
r)
0 50 100 150
0.41
0.42
0.43
0.44
0.45
0.46
0.47ENDF/B-VI.8 Ei8.00E+0ENDF/B-VII.0 Ei8.00E+0JENDL-4 Ei8.00E+0ENDF/B-VII.1 Ei8.00E+0
Cross sections
Angle (deg)
dm/d1
(b/s
r)
0 50 100 1500.35
0.40
0.45
ENDF/B-VI.8 Ei1.50E+4ENDF/B-VII.0 Ei1.50E+4JENDL-4 Ei1.50E+4ENDF/B-VII.1 Ei1.50E+4
E = 8 eV
E = 15 keV
Cross sections
Angle (deg)
d!
/d"
(b/s
r)
0 50 100 150
10-1
1
ENDF/B-VI.8ENDF/B-VII.0JENDL-4ENDF/B-VII.140-Zr-0(N,EL),DA
E = 3.6 MeV
Agreement with data fantastic
Shape of distribution now makes sense
Benchmarking of new evaluations
12
B7.0
B7.1
J4 + B7.0
Benchmarking by A. Trkov