How to set the low energy neutron cross sections

[horvathd (Dávid Horváth)]

Dear Xiong,

one addition to Alex’ answer: The LOW-MAT cards has to be added for the elements you specified (LITHIUM and FLUORIN) and not for the compound material (6LiF).

You find more information in this topic:

Low energy neutron xsec not found for some media

Dear Xi, there are two options to fix it: 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. 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 requiremen…

Cheers,
David