Beam of proton through the targets

i have a question

why the proton beam does not pass through the targets
i use the example activation and i change the source of neutron

Run few events with /tracking/verbose 2 may help you.

I tried but it doesn’t work

It works in example Activation ! (as in any other examples …)
What did you change ?

I changed the material and the type of beam

Thanks for your help I already solved it, in the mac file the energy was in millielectrovolts, but I need megaelectrovolts

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