Proton nuclear simulation issue (MCNP6)

[evjanuclear]

Hi,
I'm simulating in MCNP6 the reaction of proton beam on targets but in the simulation the 96% of the proton are lost for energy cutoff.
I don't understand why happen that. I use a tally4 to obtain the reaction in the target, but I suppose the results are wrong because the lost of protons (if they are lost they can´t interact isn´t it?)

Any idea?

Thanks,
Eva

 

[PSRB191921]

Eva,
Can you tell us the energy of the protons and the material of the target ?