Unknown discrepancy in neutron transport

[liangjg]

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

• zoom in

[paulromano]

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