MCNP considers the material particles as in a random arrangment, I need to get the advantage of the crystal property of (AL2O3) sapphire as a neutron filter. I could not figure out how to add this cross scection of sapphire to MCNP and use it. If somebody could help please.
MCNP uses the default free gas thermal treatment for low energy neutrons. For higher accuracy (e.g., consideration of chemical binding effects and crystal structure), one would need to declare the S(α,β) in the Materials Card. Unfortunately, the S(α,β) for sapphire may not be available in MCNP installed libraries. But S(α,β) of O in sapphire is available for download in JEFF-3.3 in ACE format, in the website of OECD-NEA. To add downloaded cross sections, you would need to insert them into the MCNP library locations and edit the XSDIR.
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