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Thermal scattering and P1 matrixes

With the exception of main moderator elements for all the materials included in the WIMS-D library the free gas model was used for calculating the thermal scattering matrix. For moderators the models listed below were applied:
Material WIMS ID Scattering law MAT
1-H H2O 3001 Hydrogen bound in water 1
1-H ZrH 5001 Hydrogen bound in ZrH 7
1-D D2O 3002 Deuterium bound in water 11
4-Be-nat 9 Berillium 26
6-C nat 2012 Carbon 31
8-O nat 6016 Free gas 0
On the other hand, the transport cross section correction was applied to all materials, with the exception of 4 moderator listed below for which the P1 matrix is available:
P1 Matrices

Order

Material

WIMS
ID

T [K]

Description

Data Source

1

1-H H2O

3001

296

Hydrogen bound in water.
PWR spectrum

ENDF/B-VI.8

2

1-D D2O

3002

296

Deuterium bound in D2O.
HWR spectrum

ENDF/B-VI.8

3

6-C nat

2012

296

Graphite.
PWR spectrum

ENDF/B-VI.8

4

8-O nat

6016

293

Oxygen.
PWR spectrum

ENDF/B-VI.8


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