How Do You Upgrade the MCNP5 Library?

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To upgrade the library in MCNP5, users should place the new ACE files in the MCNP_DATA directory and modify or replace the xsdir file that indexes them. It's advisable to stick with the same standard cross section library for a specific MCNP version to maintain result consistency and reliability. Using different libraries may lead to discrepancies in results or even program crashes. Trust in the software's results is emphasized as a key reason for using MCNP. Proper library management is crucial for accurate simulations.
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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.
 
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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.
 

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