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