Exercise 6:
GROUPR Auto-Reaction Run




This exercise will make use of the RECONR and GROUPR modules to compute all the U-235 cross sections and matrices at zero Kelvin using the automatic reaction loop.

Copy t511 from the NJOY distribution to tape20. This file contains the ENDF/B-V version of the U-235 cross sections. Create a file named in6 containing the following lines (as usual, you can leave off the comments to the right of the slash symbol): 

           reconr
           20 21
           'exercise 6'/    new tape ID title
           1395 1/          MAT
           .002/            fractional tolerance
           '92-U-235'/      descriptive card for new tape
           0/
           groupr
           20 21 0 22
           1395 1 0 5 1 1 1 1/ 
           'exercise 6'/
           0.              
           1e10
           4/               a simple four-group structure
           1.e-5 .624 1.e3 1.e6 10.e6
           3/               do all cross sections
           6/               do all matrices
           0/
           0/
           stop

Run the NJOY job, and then look at the resulting output file. See what reactions show up for cross sections and matrices.

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23 January 1998 T-2 Nuclear Information Service ryxm@lanl.gov