DEUT react with protons in the same way it reacts with neutrons. a few protons will set off a chain reaction making more protons. how are you producing neutrons?
yes pressurizing PLUT makes NEUT. PHOT through HYGN makes PROT. probably wont help you at all.
another way of producing neutrons is to use a casing of TNT inside your DEUT charge and have BCLN in it which is set to NEUT.