matxsr - low energy U-235 fission spectrum

[vfarhangfallah]

Hello ,
I encountered a problem while generating a multigroup library (199n+42g group structure of VITAMIN-B6 ) in MATXS format for U235. As we can see from output of 10d block data, fission spectrum in low energy region of U235 is miscalculated (its sum is 7.9331e-10 instead of 1.0!!!)
10d 2.59181E-11 2.59181E-11 2.59181E-11 2.59181E-11 2.59181E-11
2.59181E-11 2.59181E-11 2.59181E-11 2.59181E-11 1.21478E-11 1.21478E-11
1.21478E-11 1.21478E-11 1.21478E-11 1.21478E-11 1.21478E-11 1.21478E-11
1.21478E-11 1.21478E-11 9.53387E-12 9.53387E-12 9.53387E-12 9.53387E-12
9.53387E-12 9.53387E-12 9.53387E-12 9.53387E-12 9.53387E-12 9.53387E-12
9.89085E-12 9.89085E-12 9.89085E-12 9.89085E-12 9.89085E-12 9.89085E-12
9.89085E-12 9.89085E-12 9.89085E-12 9.89085E-12 8.24238E-12 8.24238E-12
8.24238E-12 8.24238E-12 8.24238E-12 8.24238E-12 8.24238E-12 8.24238E-12
8.24238E-12 8.24238E-12 5.52866E-12 5.52866E-12 5.52866E-12 5.52866E-12
5.52866E-12 5.52866E-12 5.52866E-12 5.52866E-12 5.52866E-12 5.52866E-12
3.74402E-12 3.74402E-12 3.74402E-12 3.74402E-12 3.74402E-12 3.74402E-12
3.74402E-12 3.74402E-12 3.74402E-12 3.74402E-12 2.26665E-12 2.26665E-12
2.26665E-12 2.26665E-12 2.26665E-12 2.26665E-12 2.26665E-12 2.26665E-12
2.26665E-12 2.26665E-12 1.85453E-12 1.85453E-12 1.85453E-12 1.85453E-12
1.85453E-12 1.85453E-12 1.85453E-12 1.85453E-12 1.85453E-12 1.85453E-12
1.68144E-12 1.68144E-12 1.68144E-12 1.68144E-12 1.68144E-12 1.68144E-12
1.68144E-12 1.68144E-12 1.68144E-12 1.68145E-12 7.91268E-13 7.91268E-13
7.91268E-13 7.91268E-13 7.91268E-13 7.91268E-13 7.91268E-13 7.91268E-13
7.91268E-13 7.91268E-13 2.96726E-13 2.96726E-13 2.96726E-13 2.96726E-13
2.96726E-13 2.96726E-13 2.96726E-13 2.96726E-13 2.96726E-13 2.96726E-13
2.30787E-13 2.30787E-13 2.30787E-13 2.30787E-13 2.30787E-13 2.30787E-13
2.30787E-13 2.30787E-13 2.30787E-13 2.30787E-13 1.51330E-13 1.51330E-13
1.51330E-13 1.51330E-13 1.51330E-13 1.51330E-13 1.51330E-13 1.51330E-13
1.51330E-13 1.51330E-13 7.60771E-14 7.60771E-14 7.60771E-14 7.60771E-14
7.60771E-14 7.60771E-14 7.60771E-14 7.60771E-14 7.60771E-14 7.60771E-14
3.63489E-14 3.63489E-14 3.63489E-14 3.63489E-14 3.63489E-14 3.63489E-14
3.63489E-14 3.63489E-14 3.63489E-14 3.63489E-14 2.47271E-14 2.47271E-14
2.47271E-14 2.47271E-14 2.47271E-14 2.47271E-14 2.47271E-14 2.47271E-14
2.47271E-14 2.47271E-14 6.92360E-15 6.92360E-15 6.92360E-15 6.92360E-15
6.92360E-15 6.92360E-15 6.92360E-15 6.92360E-15 6.92360E-15 6.92360E-15
1.23636E-15 1.23636E-15 1.23636E-15 1.23636E-15 1.23636E-15 1.23636E-15
1.23636E-15 1.23636E-15 1.23636E-15 1.23636E-15 8.24238E-17 8.24238E-17
8.24238E-17 8.24238E-17 8.24238E-17 8.24238E-17 8.24238E-17 8.24238E-17
8.24238E-17 8.24238E-17 9.99963E-02 9.99873E-02 1.00014E-01 4.99804E-02
4.99916E-02 9.99987E-02 9.99999E-02 2.50006E-01 2.49979E-01 2.49986E-01
2.49989E-01 2.49982E-01 2.49989E-01 2.50001E-01 2.49986E-01 2.49980E-01
2.49942E-01 2.50017E-01 2.49963E-01 2.49969E-01 2.49977E-01 2.49956E-01
2.49979E-01 2.49941E-01 2.49967E-01 2.49893E-01 2.49970E-01 2.49971E-01
2.49915E-01 2.49973E-01 2.49963E-01 2.49978E-01 2.49986E-01 2.49967E-01
2.49988E-01 2.49978E-01 1.05737E-01 1.44286E-01 4.10771E-02 3.77317E-02
3.92134E-02 1.31879E-01 9.12324E-02 1.58739E-01 8.79892E-02 1.61966E-01
6.12337E-02 1.88721E-01 1.20988E-01 1.20945E-01 1.66973E-01 2.00573E-01
2.01072E-01 2.04204E-01 1.82227E-01 3.03500E-01 8.27584E-01 1.03757E+00
7.05280E-01 8.16471E-01 7.80860E-01 5.35110E-01 3.18779E-01 2.60687E-01
8.56794E-02 1.67336E-02 1.15517E-03

I used Visual Studio 2019 and intel visual Fortran compiler 19.1.3.311 to compile and test different NJOY releases (69, 74, and 75) on Windows 10 . In addition, I checked different ENDF-6 format libraries such as ENDFVIII.0, ENDFVII.1 and JENDL4.0 but all of the gave the wrong results.
The attached files contains execute files and input files (I can send Visual Studion solution if it is needed too).
Best Regards
attached_files.zip