openmc-dev / validation

Collection of validation scripts, notebooks, results

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Unknown discrepancy in neutron transport

liangjg opened this issue · comments

I found some small discrepancies in the neutron spectrums between openmc and mcnp with very simple models. For example, in fixed source calculations with a pure H1 model, the differences between the two codes are obviously greater than the statistical errors in the low energy region ([1E-3, 1e-1]ev at 300K). Not sure if this is expected or of concern. @paulromano

  • comand to reproduce
openmc-validate-neutron-physics H1 -x path/to/mcnp_endfb71/xsdir -e 1000 -p 100000000 -s 80c
  • plot

H1-1 0e+03eV-293 6K

  • zoom in

zoom_in

Hmm, interesting. I'll dig into the data a bit to see if I can figure out why this might be. Thanks for reporting!