Given what I’d guess is an at rest or extremely low energy nucleus, I don’t see any obvious issue with the numbers, though without knowing the exact particles these correspond to I can’t make a hard judgment.
I’d suggest running with more verbose tracking, e.g. in a macro or interactively use the command
/tracking/verbose 1
to log to the terminal detailed information about the step, particle and processes. That’s best for exploratory runs, and you might want to set the number of threads to 1, or see:
to ensure the output is buffered clearly.