How Do You Upgrade the MCNP5 Library?

[bozinion]

hello guys. I would like to ask you if anyone knows how to upgrade the library at mcnp5. I downloaded the last version for mcnp5 but I don't know how to change it. please help. Thank you.

 

[Alex A]

Hi. The usual method to add a cross section library is to put the ace files in MCNP_DATA (or wherever you have your data) and make changes to or replace the xsdir file that indexes them. You can also, at a push, use more than one xsdir with different names.

This said, it's normal to use the same standard cross section library as much as possible with a given MCNP version for trust reasons. Change the library and the results won't completely match, and it's possible a new library could crash the program or produce wrong answers.

In my opinion, trust is the reason to use MCNP.