Exercise 7: Cross Sections for WIMS

 NJOY is most valuable when it makes data for code systems used for practical application calculations. As an example, we will use one of the NJOY standard test problems to prepare a WIMS library for Pu-239 from ENDF/B-IV. Here is a copy of the core part of in11 from the NJOY distribution:
```      moder
20 -21
reconr
-21 -22
'pendf tape for pu-238 from endf/b-iv tape 404'/
1050 3/
.005/
'94-pu-238 from endf/b tape t404'/
'processed by the njoy nuclear data processing system'/
'see original endf/b-iv tape for details of evaluation'/
0/
-21 -22 -23
1050 3 0 1 0 /
.005/
300. 900. 2100.
0/
unresr
-21 -23 -24
1050 3 7 1
300 900 2100
1.e10 1.e5 1.e4 1000. 100. 10. 1
0/
thermr
0 -24 -25
0 1050 8 3 1 0 1 221 0
300. 900. 2100.
.05 4.2
groupr
-21 -25 0 -26
1050 9 0 5 3 3 7 1
'94-pu-238'/
300. 900. 2100.
1.e10 1.e5 1.e4 1000. 100. 10. 1
3 1 'total'/
3 2 'elastic'/
3 16 'n2n'/
3 17 'n3n'/
3 18 'fission'/
3 102 'capture'/
3 221 'free gas thermal'/
6 2 'elastic'/
6 16 'n2n'/
6 17 'n,3n'/
6 18 'fission'/
6 51 'discrete inelastic'/
6 -59 'continued'/
6 91 'continuum inelastic'/
6 221 'free gas thermal'/
0/
3 1 'total'/
3 2 'elastic'/
3 18 'fission'/
3 102 'capture'/
3 221 'free gas thermal'/
6 2 'elastic'/
6 221 'free gas thermal'/
0/
3 1 'total'/
3 2 'elastic'/
3 18 'fission'/
3 102 'capture'/
3 221 'free gas thermal'/
6 2 'elastic'/
6 221 'free gas thermal'/
0/
0/