Dear FLUKA experts,
I observed a strange artefact of the neutron spectrum when using lead in
my geometry:
It occurs at 20 MeV, at the transition where multigroup transport takes
over. Below 20 MeV, there is 10% increase of the neutron flux, which is
unphysical. It is very pronounced for lead, barely visible if I change
the material to IRON, and dissapears if I replace material LEAD with
VACUUM. I am aware of different binning, what is on the Figure are FLAIR
plots from _tab.lis files. I am trying to break down the geometry and
source to something simpler to demonstrate here, but it takes time and
maybe somebody has already seen something similar and can help ?
Thank you,
Mitja
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Received on Tue Apr 14 2020 - 23:24:33 CEST