


Thermal
scattering and P1 matrixes 

With
the exception of main moderator elements for all the materials included
in the WIMSD 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 
1H
H2O 
3001 
Hydrogen
bound in water 
1 
1H
ZrH 
5001 
Hydrogen
bound in ZrH 
7 
1D
D2O 
3002 
Deuterium
bound in water 
11 
4Benat 
9 
Berillium 
26 
6C
nat 
2012 
Carbon 
31 
8O
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 


WIMS
ID

T
[K]

Description

Data
Source



3001

296

Hydrogen
bound in water.
PWR
spectrum

ENDF/BVI.8

2

1D
D2O

3002

296

Deuterium
bound in D2O.
HWR
spectrum

ENDF/BVI.8

3

6C
nat

2012

296

Graphite.
PWR
spectrum

ENDF/BVI.8

4

8O
nat

6016

293

Oxygen.
PWR
spectrum

ENDF/BVI.8




