Troubleshooting MCNP6.2 Error: l_list Too Small

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The user encountered a specific error in MCNP6.2 related to the subroutine mars_xs_init, indicating that the list is too small when tracking decay isotopes. They seek assistance from others who may have experienced this issue. A suggestion was made to check for the presence of bfld and bflcl input cards, which are necessary for the 'mars' method used in ray tracing charged particles. If the problem persists, sharing a minimal input file that triggers the error could help others identify the issue. The discussion emphasizes the importance of proper input configuration in resolving the error.
angweieng
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MCNP error code: bad trouble in subroutine mars_xs_init of imcn
Hi everyone,

I have used MCNP6.2 for few years. This is the first time that I encountered the error such as below:

bad trouble in subroutine mars_xs_init of imcn
l_list too small.

I tried to run an input deck and track a bunch of decay isotopes. Is anyone has similar error before? If you do, do you know what's the problem of this error? Thank you so much!
 
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I am out of my depth and posting only because no-one better has replied yet.

'mars' is a method used for ray tracing charged particles through a magnetic field. Do you have bfld and bflcl input cards?

If that doesn't help I can only suggest you post a minimal input file that produces the error and maybe someone will see the problem.
 

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