Low energy neutron xsec not found for some media

Geometry and Materials
4

Dear Xi,

there are two options to fix it:

  1. Change the name on the MATERIAL card to SULFUR.
    The list of names used in FLUKA is here: https://flukafiles.web.cern.ch/manual/10.4.1.2.html
    If you use these names for the elements, then FLUKA automatically selects the first appropriate cross section.

  2. Add a LOW-MAT card, associating the name used on the MATERIAL card with a cross section.

While the neutron cross sections are not relevant for your simulation, it is still an internal requirement of FLUKA to associate one with each element.

Cheers,
David